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Demand Analysis of Individuation Pine Resources for Fine Chemical Utilization of Pine Oleoresin
Zhendong ZHAO, Jing WANG, Yanju LU, Yuxiang CHEN
Chemistry and Industry of Forest Products    2021, 41 (3): 1-10.   DOI: 10.3969/j.issn.0253-2417.2021.03.001
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Desirable pine resources are the basis for the sustainable, high value-added and fine chemical utilization of pine oleoresin. According to the chemical composition and structural characteristics of pine oleoresin, combined with the analysis of the current situation of pine oleoresin resources as well as their deep processing and utilization industries, the demand for individuation pine resources is discussed from the perspective of fine utilization. By the perspectives of production, processing, utilization and benefits, intensive high-quality pine oleoresin resources are needed, which have strong oleoresin exudation, long-lasting resinosis, good quality, and easy processability. And by the perspective of deep processing and utilization, individuation oleoresin resources are needed further, which have higher quality, more useful, more balanced or more outstanding specific components. To research and breed individuation pine resources such as pimaric-type rosin, isopimaric-type rosin, mercusic-type rosin, α-pinene-type turpentine, β-pinene-type turpentine, 3-carene-type turpentine, β-phellandrene-type turpentine and longifolene-type heavy turpentine, are scientifically important and applicably valuable for the fine chemical utilization, high value-added deep processing of rosin and turpentine. It is recommended to focus on the main oleoresin-tapping pine species such as P. massoniana, P. kesiya var. langbianensis, P. elliottii, P. elliottii×P. caribaea, P. latteri Mason, etc., and carry out more integrative and interdisciplinary researches on oleoresin chemistry, fine chemicals, genomics, metabolomics, genetic breeding, resource cultivation, and chemical engineering of forest products.

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Research Progress of Hydrophobic Modification of Nanocellulose
Lingyuan WANG, Lanfeng HUI
Chemistry and Industry of Forest Products    2021, 41 (3): 125-133.   DOI: 10.3969/j.issn.0253-2417.2021.03.016
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Nanocellulose is a kind of nano-sized cellulose extracted from natural cellulose. It not only has the basic characteristics of cellulose, but also has large specific surface area, unique strength and optical properties originated from nano-size. However, the presence of free hydroxyl groups in cellulose is hydrophilic, which reduces the stiffness of nanocellulose materials in humid environments and limits its application fields. Therefore, hydrophobic modification of nanocellulose can expand its scope of application. This article reviewed the methods of hydrophobic modification of nanocellulose in recent years, including physical adsorption modification, esterification/acetylation modification, graft copolymerization, silane coupling agent modification, etc., and summarized the research results of the above methods, as well as the advantages and disadvantages. And the future development direction was prospected in order to provide reference for hydrophobic modification research.

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Production of Xylooligosaccharides and Monosaccharides from Poplar by Two-step Sodium Chlorite and Sodium Hydroxide Pretreatment
Xin FANG, Peiyao WEN, Yong XU, Junhua ZHANG
Chemistry and Industry of Forest Products    2021, 41 (5): 23-30.   DOI: 10.3969/j.issn.0253-2417.2021.05.004
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In this work, the effects of sodium chlorite(SC) and sodium hydroxide(SH) pretreatments on the chemical composition of poplar were investigated. The preparation of xylooligosaccharides(XOS) and monosaccharides by enzymatic hydrolysis was discussed. The results showed that poplar lignin could be selectively removed by SC pretreatment. After 6% SC pretreatment at 70℃ for 3 h, the removal of lignin reached 65.8%, whereas 90.7% glucan and 92.4% xylan were retained. The data of X-ray diffraction and X-ray photoelectron spectroscopy indicated that SC pretreatment removed the total lignin in poplar and the surface lignin on poplar, and increased the crystallinity and accessibility of the substrate. After the pretreatment with 6% SC at 70℃ and 1% SH at 50℃, the contents of glucan, xylan, and lignin in the pretreated poplar were 67.8%, 21.5%, and 2.9%, respectively. The highest XOS yield of 47.2% from the SC-SH-pretreated poplar by xylanase hydrolysis was obtained, and the XOS preparation was composed of 98% xylobiose. Compared with the poplar treated by 6% SC at 70℃ for 3 h, SH pretreatment increased the yield of XOS by 7.1 times. After the hydrolysis by xylanase, the glucose yield of two-step pretreated poplar residue was 90.2% with a cellulase lading of 30 mg/g dry matter. Finally, 52.5 g XOS, 317.6 g glucose and 49.9 g xylose were obtained from 1 kg raw poplar. The results of this work provided a theoretical guidance for the preparation of XOS and monosaccharides from poplar under mild conditions.

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Antibacterial and Antioxidant Activities of Two Citrus Essential Oils and Their Main Components
Huazheng CHEN, Kai ZHU
Chemistry and Industry of Forest Products    2021, 41 (4): 17-22.   DOI: 10.3969/j.issn.0253-2417.2021.04.003
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Orange oil, tangerine oil and limonene were used as target samples to study their scavenging capacities on ABTS+·, DPPH· and O2-· and total antioxidant capacity(FRAP value), as well as their antioxidant abilities in vivo and inhibitory abilities to Staphylococcus aureus, Escherichia coli, Bacillus subtilis and Pseudomonas aeruginosa. The results showed that tangerine oil had the best scavenging capacity on ABTS+· and DPPH·, their IC25 values were 1.481 and 24.824 g/L, respectively; limonene had the best scavenging effect on O2-·, and the scavenging rate was 32.86% at 0.8 g/L. The ferric ion reducing antioxidant power(FRAP) values of limonene, orange oil and tangerine oil were close to each other and weaker than those of BHA. At the mass concentration of 100 mg/L, the catalase(CAT) activities in Caenorhabditis elegans treated with tangerine oil and limonene were about 46 U/mg, which was 1.63 times of that in the untreated control group. Orange oil, tangerine oil and limonene had a relatively good inhibitory effect on S. aureus and E. coli. The inhibitory effect of tangerine oil on S. aureus was close to limonene, and the diameter of inhibition zone was about 11 mm. Orange oil, tangerine oil and limonene had an excellent antioxidant activity in vitro and in vivo, and they were moderately sensitive to S. aureus.

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Research Progress on Nanocellulose and Its Use in Lithium Batteries
Ying WANG, Chunhui MA, Jin ZHOU, Mengyang LI, Jinquan YUE
Chemistry and Industry of Forest Products    2021, 41 (6): 105-116.   DOI: 10.3969/j.issn.0253-2417.2021.06.014
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As a natural material with good biocompatibility and biodegradability, nano-cellulose has unique structure and excellent mechanical properties. It has been widely used in the construction of electrochemical energy storage system of lithium-ion batteries(LIBs), and has made significant progress. This thesis provided an overview of the preparation and modification methods of cellulose nanofibrils(CNF), cellulose nanocrystals(CNC) and bacterial cellulose(BC) in the context of the application of advanced energy storage devices LIBs and green materials nanocellulose, and reviewed the research progress on the application of nanocellulose in the field of LIBs. It was mainly divided into three aspects: first, nanocellulose-based flexible LIBs electrodes; second, carbon materials derived from nano cellulose as electrodes; third, nano cellulose derived battery separator. Finally, some problems in this field were analyzed, summarized and prospected.

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Research Progress on Chemical Constituents and Activities of Genus Usnea Lichens
Ziying YANG, Jing LI, Jie SU, Huiling LI, Zhang ZHANG, Feng PENG
Chemistry and Industry of Forest Products    2021, 41 (3): 112-124.   DOI: 10.3969/j.issn.0253-2417.2021.03.015
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As a medical plant with a long history, the Usnea species of lichen are widely distributed in China. However, the research about its chemical composition and activity is rare, delayed, and the basic data accumulation is weak, which restricts its further development and utilization.The primary metabolites polysaccharide(lichenan, isolichenan, galactomannan, and heteropo-lysaccharide) and fatty acids, and secondary metabolites(single benzene ring derivatives, depsides, depsidones, and benzofuran) of the Usnea species of lichen are reviewed in this article.The research progress of the bioactivity of lichen polysaccharide and lichen acid are introduced. Lichen polysaccharides have functions of antioxidation and antitumor; and lichen acids have functions of insecticidal, antibacterial, anticancer, antitumor, antioxidation, antivirus, antiinflammatory, liver-protecting, detoxication, and enzyme inhibition.

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Research Progress of Lignin-based Porous Carbon Materials and Its Applications in Water Purification
Can JIN, Yunlong LIU, Shuping HUO, Guomin WU, Guifeng LIU, Zhenwu KONG
Chemistry and Industry of Forest Products    2021, 41 (4): 111-123.   DOI: 10.3969/j.issn.0253-2417.2021.04.015
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Due to the excellent physical and chemical properties such as high specific surface area, large porous volume and adjustable structure morphology, porous carbon materials have been proven to show outstanding adsorption performance for water pollutants. Lignin is a kind of natural and abundant biomass resource. It has the characteristics of high carbon content, low cost, and easy to modification. Thus, it has been regarded as an ideal precursor for replacing traditional fossil resources to prepare porous carbon materials. This review focuses on the preparation methods of lignin-based porous carbon materials and the application research progress in the adsorption and degradation of heavy metal ions, dyes, aromatic compounds, and antibiotics from water. Based on the problems existing in the application of water purification treatment, the development trend of lignin-based porous carbon materials is also prospected.

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Preparation and Properties of Cellulose/PVA Composite Aerogels
Meng WANG, Li TANG, Li GAO, Rongfen QU, Tougen LIAO, He LIU
Chemistry and Industry of Forest Products    2021, 41 (3): 95-102.   DOI: 10.3969/j.issn.0253-2417.2021.03.013
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Based on the freeze-drying process and chemical vapor deposition technology, polyvinyl alcohol(PVA) was compounded with cellulose to enhance the mechanical compressibility and dimensional stability of cellulose(CE) aerogels, followed by the fabrication of highly elastic, hydrophobic, and porous CE/PVA composite aerogels. The effects of PVA content on the mechanical properties of CE/PVA composite aerogels were studied. As the mass fraction of PVA increased, the compressive strength of cellulose aerogels increased. When the amount of PVA was 15% of the mass of cellulose, the compressive strain increased to 66 kPa, which was increased by 6.5 times. Simultaneously, the influences of silane modification on the microstructure, thermal stability, hydrophobicity, specific surface area and physical properties of composite aerogels were explored, and the results showed that S-CE/PVA composite aerogel modified by methyltriethoxysilane(MTES) had a denser lamellar structure, the initial decomposition temperature rose to 314.6℃, the water contact angle was as high as 115°, the specific surface area was 109.42 cm3/g, the density was 0.045 g/cm3, and the porosity was greater than 95%.

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Research Progress on Electrode Materials from Activated Carbon-based Supercapacitors
Haonan CHEN, Ting YU, Yali ZHOU, Xiping LEI, Xiaolin GUAN
Chemistry and Industry of Forest Products    2021, 41 (5): 113-125.   DOI: 10.3969/j.issn.0253-2417.2021.05.016
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Supercapacitors are a new type of green energy storage device with the advantages of fast charging and discharging and long service life. The electrode material is the core component of supercapacitors. The carbon from biomass is considered as a good choice for the preparation of activated carbon because of its wide variety, low price, environmental friendly, porous structure and rich in hetero-atoms, and it is the most popular electrode material for commercial applications. This paper reviewd the effects of pore structure and specific surface area on the performance of electrochemical energy storage of activated carbon, summarized the common pore structures of biomass activated carbon such as tubular, lamellar, honeycomb and network and their electrochemical properties, and analyzed the effects of different biomass components on the performance of activated carbon from three categories: plant-based, animal-based and microbial-based. Finally, the traditional methods of preparing activated carbon and the new preparation methods in recent years were briefly introduced. The problems and challenges of biomass activated carbon were pointed out. Some suggestions were provided to guide the selection of precursors for biomass activated carbon.

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Preparation and Application of Lignin-based Intumescent Flame Retardant
Mengke LIANG, Jing CHEN, Peng DAI, Xiaofeng MA, Meng ZHANG, Zhenyang LUO
Chemistry and Industry of Forest Products    2021, 41 (4): 10-16.   DOI: 10.3969/j.issn.0253-2417.2021.04.002
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Lignin-based intumescent flame retardant(Lig-T) with carbon source, acid source and gas source was synthesized successfully by grafting nitrogen and phosphorus elements. The structure of the flame retardant Lig-T was proved by Fourier transform infrared spectrometer(FT-IR), elements analysis and X-ray photoelectron spectroscopy(XPS). The Lig-T was added to the epoxy resin with different mass fractions to obtain Lig-T/EP composite material. Thermogravimetric analysis, underwriters laboratories 94(UL-94) vertical buring test, oxygen index(LOI) test and cone calorimetry(Cone) test were used to investigate the thermal stability and flame retardancy of composite materials. The results showed that when the mass fraction of the Lig-T was 20%, the composite material 20% Lig-T/EP could reach the UL-94 V-0 level, the oxygen index value was as high as 28.5%, and the mass fraction of the residue increased from 14.8% to 20.2%.With the increase of the mass fraction of Lig-T, the total amount of heat release and the total amount of smoke released during the combustion process of the composite material decreased.

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Preparation of Anti-freezing Hydrogel Electrolyte and Its Application in Solid-state Supercapacitors
Gaitong ZHANG, Xiaoli SONG, Fusheng YANG, Jingya NAN, Fuxiang CHU, Chunpeng WANG
Chemistry and Industry of Forest Products    2021, 41 (4): 51-61.   DOI: 10.3969/j.issn.0253-2417.2021.04.008
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An anti-freezing hydrogel electrolyte(SPI-PVA-PAAm/LiCl) was synthesized, in which soybean protein isolates (SPI), ployvinyl alcohol(PVA) and acrylamide(AAm) were used as raw materials, ammonium persulfate(APS) was used as the initiator, N, N'-methylenebisacrylamide(MBAA) was used as the covalent crosslinker, LiCl was used as the electrolyte salt, and N, N, N', N'-tetramethylethylenediamine(TEMED) was used as the accelerator. Under low temperature conditions, the mechanical properties of the hydrogel electrolyte were analyzed, and the electrochemical properties of the solid-state supercapacitor based on this hydrogel electrolyte were investigated. The results showed that the hydrogel electrolyte had excellent anti-freezing propertity, because a certain molar concentration of LiCl reduced the freezing point of pure water in the hydrogel electrolyte and inhibited the crystallization behavior of water molecules. When the environmental temperature was reduced from 25℃ to -20℃, the hydrogel electrolyte still showed good mechanical properties and ionic conductivity. With the increase of the amount of LiCl, the compression performance of the hydrogel electrolyte firstly increased and then decreased, and the ionic conductivity increased. After 10 cycles of 80% compression strain, the stress retention rate, plastic deformation rate and energy loss coefficient of the hydrogel electrolyte with LiCl concentration of 5 mol/L(S-Li-5) were more than 100%, less than 25% and 0.33, respectively. The hydrogel electrolyte with LiCl concentration of 15 mol/L(S-Li-15) and CNTs were used to assemble the solid supercapacitor whose electrochemical performance was evaluated. When the ambient temperature was reduced from 25℃ to -20℃, the specific capacitance of assembled supercapacitor calculated by GCD curve could be maintained above 80%, and 0-70% compression strain could be withstood without damage, and the supercapacitor could still work normally; In addition, when the current density was 8.12 A/g, the capacitance retention rate of the device was higher than 91% after 1 000 cycles at -20℃.

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Preparation of Cellulose Nanofibril by the Pretreatment with Deep Eutectic Solvent System
Guangrui MA, Ming HE, Guihua YANG, Weidong LI, Xingxiang JI, Jiachuan CHEN
Chemistry and Industry of Forest Products    2021, 41 (4): 69-76.   DOI: 10.3969/j.issn.0253-2417.2021.04.010
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A choline chloride-urea(molar ratio of 1:2) based deep eutectic solvent(DES) system was used as a non-hydrolytic pretreatment media to prepare the cellulose nanofibrils(CNF) from bleached kraft poplar pulp by using microfluidizer. The properties of CNF were characterized by elemental analysis, scanning electron microscope(SEM), Fourier transform infrared spectroscopy(FT-IR), thermogravimetric analysis and X-ray diffraction analysis. Furthermore, the polymerization degree(DP) of CNF and the energy consumption were calculated. The results showed that DES pretreatment could promote the swelling of pulp fibers, which was beneficial to fibrillation during the microfluidization process. The microfluidization treatment, was performed 15 times. It was found that compared with the energy consumption(4.35×107 kW·h/t) of raw materials without DES pretreatment, the energy consumption(2.44×107 kW·h/t) of raw materials with DES pretreatment decreased by 43.91%. whereas the crystallinity indexes(ICr) of CNF prepared before and after pretreatment were 54% and 44%, respectively. However, DES pretreatment had no obvious effect on the polymerization degree of fiber raw materials. DES pretreatment also reduced the thermal stability of CNF. The increase of homogenization times could promote the fibrillation of fibers, and reduce the crystallinity and polymerization degree of cellulose at the same time. FT-IR analysis showed that choline cations interacted with anionic groups of cellulose fibers through static electricity during DES pretreatment. Elemental analysis showed that nitrogen-containing residues remained in CNFs.

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Synthesis and Thermal Analysis of Lignin-based Flame Retardant Containing Nitrogen and Phosphorus
Zhuo LI, Shuxian WENG, Fei SONG, Xiaoli REN, Xiaohui YANG, Lihong HU
Chemistry and Industry of Forest Products    2021, 41 (3): 63-70.   DOI: 10.3969/j.issn.0253-2417.2021.03.009
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Using depolymerized lignin(DL) as raw material, Schiff base nitrogen-containing lignin(N-DL) was prepared by phase transfer ultrasonic method, and then further reacted with 9, 10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide(DOPO) to synthesize nitrogen-phosphorus modified DL(NP-DL). NP-DL was a new type of expanded lignin-based nitrogen and phosphorus flame retardant. The structure and performance of NP-DL were characterized by FT-IR, 1H NMR, 31P NMR, TG, TG/FT-IR, TG/MS, GPC and XPS. The results showed that N and P were successfully introduced into the depolymerized lignin; TG analysis showed that the carbon residue rates of NP-DL at 600 and 800℃ were increased by 1 285.5% and 362.6% compared with those of DL, respectively. The test results of TG/FT-IR and TG/MS showed that NP-DL was thermally degraded to produce phosphorus: [OP+] with m/z=47, [H3PO] with m/z=50, [O2P+] with m/z=63 and[HO2P+] with m/z=64 proved that the phosphorus-containing compounds produced during the pyrolysis of NP-DL inhibited combustion.

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Co-production of Xylooligosaccharides and Bacillus subtilis from Poplar
Peiyao WEN, Jiaxin YOU, Yong XU, Junhua ZHANG
Chemistry and Industry of Forest Products    2021, 41 (5): 1-7.   DOI: 10.3969/j.issn.0253-2417.2021.05.001
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Acetic acid(AC) hydrolysis and the second-step pretreatment were used to produce xylooligosaccharides(XOS) and enzymatic hydrolysate from poplar. The hydrolysate was used as carbon resource to produce Bacillus subtilis by fermentation. After the poplar was pretreated by 5% AC at 170℃ for 30 min, the XOS yield of the pretreatment liquor was 55.8%. In the second-step pretreatment, the order of improvement on enzymatic hydrolysis of AC-pretreated poplar was showed as follows: hydrogen peroxide-acetic acid(HPAC), sodium hydroxide, sodium hydroxide-hydrogen peroxide, γ-valerolactone(GVL), ammonia pretreatment. The AC-pretreated poplar after HPAC pretreatment had the highest digestiability and the glucose yield of the hydrolysate was 72.4%. Specially, Tween 80 could further improve the glucose yield of AC-HPAC-pretreated poplar to 93.8%. The enzymatic hydrolysate obtained from the two-step pretreated poplar was used to produce B. subtilis and the highest viable count of the fermentation liquor could reach 2.1×109 CFU/mL. After fermentation for 11.5 h, the utilizations of glucose and xylose were 95.3% and 25.0%, respectively. The results in this work could guide for the co-production of XOS and B. subtilis from poplar, and provide a reference for the high value-added conversion of poplar.

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Preparation and Characterization of Room Temperature Vulcanized Silicone Rubber Cross-linked by TiO 2 Modified Dehydroabietic Acid
Xinxin YANG, Zhaoyu JIANG, He LIU, Xujuan HUANG, Zhaosheng CAI, Shibin SHANG
Chemistry and Industry of Forest Products    2021, 41 (4): 42-50.   DOI: 10.3969/j.issn.0253-2417.2021.04.007
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Dehydroabietic acid(DA) reacted with 3-glycidyloxypropyltriethoxysilane(GTS) to synthesize dehydroabietic acid-based cross-linking agent(DAG), and then DAG was combined with TiO2, catalyst dibutyltin dilaurate, and hydroxyl polysiloxane(PDMS) to fabricate the TiO2 modified dehydroabietic acid cross-linked the room temperature vulcanized silicone rubber(TiO2-DAG/RTVSR). The microscopic morphology, mechanical properties, thermal stability, and hydrophobicity of the samples were investigated. The results showed that DAG and TiO2 were uniformly dispersed in the dehydroabietic acid cross-linked silicone rubber. Compared with DAG/RTVSR-3 obtained by only adding DAG, when the addition of TiO2 was 7%, the tensile strength of the obtained TiO2-DAG/RTVSR-4 increased from 0.65 MPa to 0.98 MPa which increased by 50.8%, and the elongation at break increased from 250% to 317%.The 5% mass loss temperature of silicone rubber increased from 324.5℃ to 338.8℃ as the addition of TiO2 increased from 0% to 7%; and the swelling degree decreased, which indirectly reflected the increase in the degree of cross-linking.The contact angle gradually decreased with the increasing of TiO2 amount. These results indicated that the synergistic effect of dehydroabietic acid with rigid structure and TiO2 into the molecular chain of silicone rubber could effectively enhance the mechanical properties and thermal stability of room temperature vulcanized silicone rubber.In summary, silicone rubber with 7% TiO2 had the best performance.

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Preparation and Corrosion Resistance of Tannin Acid/Toughened Shellac Resin Composite Coating
Chunyin LI, Kun LI, Yanlin SUN, Yiwen LIU, Hong ZHANG, Fuhou LEI
Chemistry and Industry of Forest Products    2021, 41 (4): 1-9.   DOI: 10.3969/j.issn.0253-2417.2021.04.001
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In order to improve the toughness of shellac(SHL) resin, eleostearic acid(EA) was added to shellac resin through Diels-Alder reaction to prepare toughened shellac(TS) resin, and its structure was analyzed by gel chromatography(GPC), infrared spectroscopy(FT-IR) and 13C nuclear magnetic resonance(13C NMR). And then, tannic acid(TA) was added to prepare SHL-TA, and TS-TA composite coating. The effects of TA and EA on the anti-corrosion properties of shellac resin coating were analyzed by electrochemical workstation, neutral salt water resistance and neutral salt spray(NSS) resistance tests. The results showed that the TS modified by EA through the Diels-Alder reaction exhibited good toughness. When the weight ratio of SHL and EA was 1.8:1, the elongation at break of TS-3 coating was as high as 381.81%. In addition, the hydrophobicity of shellac coating was increased by the modification of EA, and its static water contact angle reached 95.01°.The addition of TA could improve the adhesion of the coating on the metal substrate, and the combined action of TA and EA could enhance the anti-corrosion of SHL coating. The best corrosion protection system was TS-3-TA coating. After immersion in 3.5% NaCl for 48 h, the polarization resistance of the coating was still 36.3 kΩ, far more higher than that of other coatings. And the time of neutral salt water resistance and neutral salt spray(NSS) resistance tests of TS-3-TA, which was prepared in alkali system, was 120 h and 168 h.

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Matrix Solid-phase Dispersion Combined with GC-MS for Determination of Chemical Constituents of Essential Oil in Agarwood
Hongxia CHEN, Hao ZHOU, Jianzhong YE, Ran TAO, Wenjun LI, Chengzhang WANG
Chemistry and Industry of Forest Products    2021, 41 (3): 47-54.   DOI: 10.3969/j.issn.0253-2417.2021.03.007
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Matrix solid-phase dispersion-gas chromatography combined with mass spectrometry(MSPD-GC/MS) analysis method for essential oil was established based on Hainan agarwood induced by biotechnological method. The MSPD conditions of extracting agarwood essential oil established by single factor test were magnesium silicate as the adsorbent, adsorbent/sample mass ratio 4:1, isopropanol as the dispersion solvent, dispersion solvent/sample ratio 4:1(mL: g) and 6 mL n-hexane/ethyl acetate 9:1(volume ratio) as the elution solvent. Under these conditions, the extraction yield of MSPD was (9.19±0.15)%, which was higher than ultrasonic assisted ether extraction (6.65±0.22)%. The chemical constituents of essential oil were analysis by GC/MS, and compared with that extracted by ultrasonic assisted ether extraction. The compositions of essential oil extracted by MSPD were similar to ultrasonic assisted ether extraction, the main constituents were 2.13% aromatic, 25.67% sesquiterpenoids, 26.85% chromones and 7.50% aliphatic compounds. The number of sesquiterpenoids in the essential oil extracted by MSPD was more than that of ultrasonic assisted ether extraction, such as γ-selinene, β-santalol, valerena-4, 7(11)-diene, α-guaiene, shyobunol and 1, 9-aristo-ladiene. Thus, the MSPD-GC/MS analysis method could truly reflect the chemical composition of agarwood essential oil, which could be used as a rapid identification method for the quality evaluation of agarwood.

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Research Advance in Preparation of 2, 5-Furanedioic Acid by Oxidation of 5-Hydroxymethylfurfural over Transition Metal-based Catalysts
Jifeng BAI, Yu YANG, Zhixin JIANG, Manfang CHENG, Lin ZHANG, Jingyun WANG
Chemistry and Industry of Forest Products    2021, 41 (5): 100-112.   DOI: 10.3969/j.issn.0253-2417.2021.05.015
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This article reviews the recent research progress of preparation of 2, 5-furandiformaldehyde(DFF) by the oxidation of 5-hydroxymethylfurfural(HMF) with transition metal-based catalysts. The application of manganese-based, copper-based, vanadium-based, iron/cobalt-based and other catalytic systems in the preparation of DFF by HMF oxidation is mainly introduced. The effects of different reaction conditions on the catalytic performance of the catalyst are analyzed in detail, the reaction mechanism of different catalysts is explained, and the advantages and disadvantages of different catalysts are summarized. In addition, based on the analysis of the existed problems in the current catalyst catalysis process, the development prospects of the transition metal-based catalysts catalyzed by HMF oxidation to prepare DFF are also prospected.

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Preparation and Performance of UV-curable Isobornyl Methacrylate-waterborne Polyurethane
Fuhao DONG, Yuehan QIAN, Yuqi WANG, Xiangyu LIN, Xu XU, Shifa WANG
Chemistry and Industry of Forest Products    2021, 41 (3): 71-76.   DOI: 10.3969/j.issn.0253-2417.2021.03.010
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Isobornyl methacrylate(IBOMA) and butyl acrylate(BA) were blended with waterborne polyurethane(WPU), by which these monomers(IBOMA/BA) copolymerized in waterborne polyurethane irradiated by UV light forming a series of IBOMA and BA modified waterborne polyurethane(IMAWPU) films. With the same approach, IMAWPU-0, IMAWPU-1, IMAWPU-2, IMAWPU-3 were prepared with the amount of IBOMA of 0, 1%, 2% and 4%, respectively. The structure of the cured waterborne polyurethane(WPU and IMAWPU) was characterized by FT-IR, and the morphology and performance of the waterborne polyurethane were analyzed. The results of FT-IR, SEM, AFM, and DSC showed that IBOMA and BA were copolymerized in waterborne polyurethane. With the increase of IBOMA content, the surface roughness, initial decomposition temperature as well as the thermal stability, and glass transition temperature of waterborne polyurethane increased. The initial decomposition temperature increased from 185℃ to 195℃. The performance research showed that with the increase of IBOMA content, the crosslinking density and tensile strength of waterborne polyurethane increased gradually, and the performance of IMAWPU-2 was better. Compared IMAWPU-2 with pure WPU, the tensile strength increased from 0.9 MPa to 9.3 MPa, the water absorption decreased from 178% to 31%, the pencil hardness increased from 2B to 2H, and the crosslinking density increased from 0.058 mmol/cm3 to 6.36 mmol/cm3.

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Preparation and Slow-release Properties of Cinnamomum cassia Leaves Essential Oil/ β-Cyclodextrin Microcapsules
Guoliang LI, Xiangping LIU
Chemistry and Industry of Forest Products    2021, 41 (4): 35-41.   DOI: 10.3969/j.issn.0253-2417.2021.04.006
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In order to further broaden the application of Cinnamomum cassia leaves essential oil in food, feed and other fields, C. cassia leaves essential oil/β-cyclodextrin microcapsules were prepared by co-precipitation method with β-cyclodextrin as the wall material and C. cassia essential oil as the core material. The preparation conditions of microcapsules were optimized by orthogonal experimental design. Essential oil/β-cyclodextrin microcapsules were characterized by using gas chromatography-mass spectrometry(GC-MS) and Fourier transform infrared spectroscopy(FT-IR).The results showed that the suitable preparation conditions of microcapsules were wall-core ratio 6:1, temperature 50℃, time 4 h and stirring speed 1 000 r/min. The encapsulation efficiency of C. cassia essential oil of the obtained microcapsule was 74.17%. The GC-MS analysis showed that the main compositions of C. cassia essential oil were trans-cinnamaldehyde(81.39%), followed by o-methoxycinnamaldehyde(7.61%) and the main compositions of C. cassia essential oil in the microcapsule were also trans-cinnamaldehyde(78.68%) and o-methoxycinnamaldehyde(9.34%). FT-IR analysis showed that C. cassia leaves essential oil and β-cyclodextrin formed good inclusion complex. C. cassia leaves essential oil/β-cyclodextrin microcapsules had good thermal stability and slow-release properties.

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