Table of Content

25 December 2018, Volume 38 Issue 6 Previous Issue    Next Issue

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Research Progress of Cardanol Based UV-cured Materials CHEN Jian, WU Guomin, HUO Shuping, KONG Zhenwu 2018, 38 (6):  1-10.  doi: 10.3969/j.issn.0253-2417.2018.06.001 Abstract ( 542 )   PDF (1816KB) ( 758 )   Save UV curing coatings could be applied in many fields due to its advantages such as fast drying and curing rate, energy saving, environmental protection and so on. Cardanol derived from natural biomass resources could replace petroleum phenol to be used in coatings, adhesives, polymer materials and other fields. Cardanol had high reactivity resulting fromits phenolic hydroxyl group and unsaturated double bond,which has allowed it be widely used in UV-cured materials through chemical modification. This review briefly introduced the source and molecular structure of cardanol and mainly focused on research progress of the direct UV curing of cardanol and the cardanol modification including phenolic hydroxyl modification (esterification and etherification), side chain modification and composite modification.Inaddition, this review also covers the application in the field of cardanol based UV-cured materials and the future research hotspot of UV-cured materials. References | Related Articles | Metrics

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Preparation of Amino Acid-terminated Nanocellulose and Adsorption Properties of Pb(Ⅱ) CHEN Jinwei, SHANG Shibin, SHEN Minggui, WANG Dan, FU Fei, CAI Zhaosheng 2018, 38 (6):  11-19.  doi: 10.3969/j.issn.0253-2417.2018.06.002 Abstract ( 618 )   PDF (1969KB) ( 685 )   Save Carboxylated nanocellulose(CNC) was synthesized from eucalyptus pulp by using 2,2,6,6-tetramethylpiperidinyl-1-oxy radical(TEMPO) oxidation, then dialdehyde-based nanocellulose(DANC) was synthesized by sodium periodate oxidation. Finally, the amino modification of DANC was carried out by Schiff base reaction with diethylenetriamine to obtain amino-terminated nanocellulose(ANCC). The structure and properties of nanocellulose were characterized by various methods. The results showed that DANC had an aldehyde group of 2.95 mmol/g and ANCC had an amino group of 1.7 mmol/g. The amino group on DETA was successfully grafted to nanocellulose. In the chain, the molecular chain became longer and the thermal stability of the ANCC improved. The adsorption properties of ANCC on Pb(Ⅱ) showed that, under the conditions of room temperature, dosage of ANCC adsorbent 0.1 g, initial mass concentration of adsorption solution 400 mg/L, pH value 5 and adsorption time 3 h, the adsorption capacity was 210.15 mg/g. The adsorption followed the pseudo second order kinetics equation and Langmiur adsorption isotherm, which indicated that the adsorption process was mainly chemical adsorption of single molecular layer. References | Related Articles | Metrics

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Preparation and Characterization of Organosiloxane Modified Poplar Wood Fiber MA Hongliang, CHEN Jian, JIAO Jian, DENG Yongjun, KONG Zhenwu, FANG Guigan 2018, 38 (6):  20-26.  doi: 10.3969/j.issn.0253-2417.2018.06.003 Abstract ( 558 )   PDF (1651KB) ( 719 )   Save 1,1,1,3,5,5,5-heptamethyl-3-[2-(trimethoxysilyl)ethyl] trisiloxane(HTEO) was synthesized by hydrosilylation of vinyltrimethoxysilane (VTMS) and 1,1,1,3,5,5,5-heptamethyltrisiloxane (MDHM) in the presence of Custer catalysts, and the structure of HTEO was characterized by Fourier transform infrared spectroscopy (FT-IR) and nuclear magnetic resonance (1H NMR) respectively. Then two kinds of organosiloxane modified poplar fibers (VPF and HPF) were prepared by surface modification of poplar fibers (PWF) with VTMS and HTEO. The chemical structure and surface properties of PWF before and after modification were investigated by FT-IR, scanning electron microscope (SEM), X-ray diffraction (XRD), X-ray energy dispersive spectrometer (EDS) and contact angle measurements, respectively. It was shown that the O/C value of the modified poplar fiber decreased, the content of Si increased obviously, and the surface of the fiber became rough. The hygroscopicity of the modified poplar fiber decreased and the hydrophobicity was improved. The Si content of HPF was 5.92%. The crystallinities of VPF and HPF were 72.0% and 75.6%, which increased by 14.8% and 20.6% respectively compared with that of PWF. The contact angles of water droplets on VPF and HPF surfaces after static 480 s were 106° and 134°, respectively. References | Related Articles | Metrics

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Synthesis and Characterization of Hydroxylated Woody Oil ZHANG Fei, HU Yun, LIU Chengguo, ZHOU Yonghong 2018, 38 (6):  27-32.  doi: 10.3969/j.issn.0253-2417.2018.06.004 Abstract ( 509 )   PDF (1959KB) ( 599 )   Save The epoxidized wilsoniana fruit oil (EWFO) and epoxidized rubber seed oil (ERSO) were prepared by peracetic acid method from wilsoniana oil (WFO) and rubber seed oil (RSO). The hydroxylation of EWFO and ERSO were carried out to obtain hydroxyl wilsoniana fruit oil (HWFO) and hydroxyl rubber seed oil (HRSO) using tetrafluoroborate as catalyst, and ethylene glycol as the hydroxyl reagent. The results of orthogonal test showed that the optimum preparation process of EWFO was as followed:the weight of WFO 30 g, the amount of acetic acid 11 g, the amount of hydrogen peroxide 23 g, the amount of concentrated sulfuric acid 0.4 g, the reaction time 2 h, the reaction temperature 65℃, and the epoxy value of the EWFO could reach 4.13%. The conditions of hydroxylation of EWFO and ERSO were potimized based on the hydroxy value of hydroxylation products. The results showed that the hydroxy value of the HRSO could reach 241.1 mg/g under the conditions of m(ethylene glycol):m(ERSO)=3:1, the amount of catalyst 1%,90℃ and 2 h; the hydroxy value of HWFO could reach 179.7 mg/g under the conditions of m(ethylene glycol):m(EWFO)=2:1, the amount of catalyst 1%, 100℃ and 2 h. FT-IR and 1H NMR analyses indicated that the epoxidation and hydroxylation reactions were carried out successfully under the above experimental conditions, and the corresponding epoxy woody oil and hydroxyl woody oil were obtained. References | Related Articles | Metrics

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Identification of Wild Agarwood and Cultivated Agarwood by HPLC Coupled with Multivariate Data Analysis SHANG Lili, CHEN Yuan, YAN Tingting, WANG Qian, LI Gaiyun 2018, 38 (6):  33-41.  doi: 10.3969/j.issn.0253-2417.2018.06.005 Abstract ( 478 )   PDF (1789KB) ( 584 )   Save In order to establish the identification method for wild and cultivated agarwood, Similarity Evaluation System for Chromatographic Fingerprint of Chinese Materia Medica (version 2012.130723) was used to evaluate the similarity of the HPLC chromatograms of 48 batches of agarwood samples. The identification peaks of wild and cultivated agarwood were screened by HPLC coupled with multivariate data analysis. On this basis, the Fisher linear recognition model and the partial least squares discriminant method (PLS-DA) recognition model were established. The results showed that the HPLC chromatograms of wild and cultivated agarwood were different, which provided the basis for the establishment of the identification model of wild and cultivated agarwood. The nine chromatographic peaks showed good representation in efficiently analyzing the wild and cultivated agarwood by multivariate analysis. Based on Fisher discriminant analysis, the classification accuracies of wild and cultivated agarwood within three years all reached 100%. Therefore, this model could be used for the identification of wild and cultivated agarwood within three years. The Fisher linear recognition model were y=-0.193 14x1-0.086 49x2+0.073 02x3+0.136 65x4+0.053 01x5 -0.058 5x6+0.097 58x7+0.040 24x8 -0.130 12x9,y1=-1.555 3, y2=2.641 8, y0=0.543 3. References | Related Articles | Metrics

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Construction and Electrochemical Performance of Paper-based Carbon Electrode Materials XU Sheng, LÜ Zongze, YI Xueting, ZHANG Wen, LI Zhiguo 2018, 38 (6):  42-50.  doi: 10.3969/j.issn.0253-2417.2018.06.006 Abstract ( 508 )   PDF (2285KB) ( 683 )   Save Using industrial filter paper as carbon-based material, Pluronic F127 as soft template,1,3,5-trimethylbenzene aspore-expanding agent, paper-based composite materials were prepared through hydrothermal synthesis reaction from 3-aminophenol (nitrogen source) and hexamethylenetetramine. Nitrogen-doped mesoporous carbon materials(NMC-700) was obtained by carbonization, and actived NMC(ANMC-700) was prepared by KOH activation. At the same time,the carbon-700(C-700) samples were obtained by direct carbonization of industrial filter paper and used as the control sample. Three carbonized materials were characterized by SEM, TEM, XRD and XPS. The results showed that carbon microspheres with particle size of 0.6-7 μm were formed on the surface of ANMC-700. And the pore structure was consisted of randomly distributed, worm-like pores with specific surface area of 1 559 m2/g and pore volume of 0.80 cm3/g. The nitrogen atom was successfully doped into the carbon skeleton with the nitrogen content of 3.60% and the oxygen content of 13.65%. Electrochemical performance test results showed that the capacitance of the prepared carbon materials could reach 284 F/g at the current density of 1 A/g in 6 mol/L KOH electrolyte, and could retain 173 F/g at the current density of 20 A/g, exhibiting outstanding cycling stability(98.6% capacitance retention after 10 000 charge/discharge cycles). References | Related Articles | Metrics

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Preparation and Optical Properties of Fluorescent Probes Based on Cellulose Nanocrystals SONG Ruyuan, ZHAO Luyang, XIA Zihua, WU Weibing, JING Yi, DAI Hongqi 2018, 38 (6):  51-58.  doi: 10.3969/j.issn.0253-2417.2018.06.007 Abstract ( 738 )   PDF (2377KB) ( 606 )   Save Multifunctional fluorescent cellulose nanocrystals (F-CNC) was prepared by the covalently bonded carboxylated cellulose nanocrystals (C-CNC) with 4-((2-aminoethyl)amino)-9-methyl-1,8-naphthalimide (AANI). Then, F-CNC was characterized by transmission electron microscopy (TEM), X-ray diffraction (XRD) and infrared spectroscopy (FT-IR), respectively. The optical properties and fluorescence-labeled imaging properties of F-CNC were further analyzed. The characterization results showed that AANI was successfully attached to the surface of C-CNC and the CNC substrate improved the hydrophilicity of the dye. The maximum solubility of AANI in H2O was 0.8 mmol/L, while the concentration of dye in the prepared F-CNC mother liquor was 1.2 mmol/L. F-CNC was stable in aqueous solution and exhibited a good bright yellow fluorescence emission property. At the same time, F-CNC retained the rod shape of C-CNC and had little change in size. The crystallinity and crystal structure didn't changed significantly. The crystallinities of C-CNC and F-CNC were 61.2% and 67.7%, respectively. The decrease of the solvent polarity compressed the double layer of the F-CNC and caused the aggregation of the F-CNC to some extent, resulting in higher fluorescence sensitivity of F-CNC to solvent polarity than that of AANI. The results of fluorescent labeling showed that when the mass concentrations of F-CNC were 0, 3.375×10-4 and 6.75×10-4 g/L, the survival rates of cells after incubated for 10 h were 49.08%, 44.21% and 40.71%, respectively. F-CNC had good fluorescent-labeled imaging performance for Hela cells, and had low toxicity to cells. References | Related Articles | Metrics

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High Efficient Preparation Process of p-Menthane-1,8-diamine WANG Jing, XU Shichao, ZENG Xiaojing, DONG Huanhuan, JIANG Jianxin, ZHAO Zhendong 2018, 38 (6):  59-66.  doi: 10.3969/j.issn.0253-2417.2018.06.008 Abstract ( 877 )   PDF (659KB) ( 968 )   Save p-Menthane-1,8-diamine was prepared by hydrolysis of p-menthane-1,8-diacetamide in a sealed reaction kettle with n-butanol as solvent and sodium hydroxide as catalyst. While the amount of raw material was 0.1 mol, n-butanol was 150 mL, the molar ratio of the raw material to the catalyst was 1:5, the reaction temperature was 175℃, the system pressure spontaneously increased to 0.35-0.4 MPa, and the reaction time was 18 h, a good result was obtained with 100% conversion of raw materials and more than 96% selectivity for the product, the GC content of which was 96.47%. Compared with the atmospheric process, the reaction time of the sealed process was shortened by 50%, the product selectivity was increased by 20 percentage points. Besides, good results were obtained when the inventory was increased by 10 times, furthermore, the adding proportion of solvent could be furtherly decreased. The product from sealed process was separated and purified by vacuum distillation while vacuum rectification for product from atmospheric process, the results showed that the separation and purification time of vacuum distillation was reduced by 7/8, solvent was recovered by 5.3 percentage point and could be reused, and the product yield was improved by 55.7 percentage point to 85.6% with the purity of 96.51%. References | Related Articles | Metrics

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Preparation Technology and Properties of Lacquer Wax Fatty Powder CHEN Hongxia, WANG Chengzhang, YE Jianzhong, ZHOU Hao, TAO Ran 2018, 38 (6):  67-74.  doi: 10.3969/j.issn.0253-2417.2018.06.009 Abstract ( 515 )   PDF (1131KB) ( 648 )   Save Using lacquer wax as core material, different kinds of wall materials were used to prepare lacquer wax fatty powder by spray drying. The emulsifying ability and entrapping rate were taken as response values. The preparation conditions of lacquer wax fatty powder were optimized by single factor experiment.The results showed that the wall material was the blend of maltodextrin and soybean protein isolate(SPI)(mass ratio 4:1);the emulsifier was sucrose fatty acid ester and glyceryl monostearate(mass ratio 8:2), and the addition amount was 3.5%(based on the total mass of core wall); the amount of arabic gum was 2.5%, the ratio of wall to core was 2:1, the total solid content was 30%. Under these conditions the emulsifying ability of emulsion was 94.2% and the embedding rate was 83.46%. Fourier transform infrared spectroscopy (FT-IR) showed that the entrapped structure of lacquer wax fatty powder was initially formed. The results of GC-MS showed the emulsification and spray drying almost no influence to the composition of main fatty acids in lacquer wax fatty powder. The lacquer wax fatty powder contained 68.329% palmitic acid, 19.245% oleic acid and 8.673% stearic acid. Scanning electron microscopy (SEM) and particle size analyzer showed that the lacquer wax fatty powder was spherical, and its particle size was mainly distributed from 1 to 5 μm. The accelerated oxidation storage test showed that the peroxide value (67.8 mmol/kg) of lacquer wax was significantly higher than that of lacquer wax fatty powder(27.2 mmol/kg) after microencapsulation, indicating that microencapsulation could effectively reduce the oxidative rancidity of lacquer wax. References | Related Articles | Metrics

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Synthesis and Characterization of Lignin Based Chain Transfer Agent Used for RAFT Polymerization WANG Guangbin, CHEN Jiabao, GU Limin, WANG Chunpeng, XU Yuzhi 2018, 38 (6):  75-80.  doi: 10.3969/j.issn.0253-2417.2018.06.010 Abstract ( 672 )   PDF (1164KB) ( 750 )   Save Lignin based chain transfer agent (lignin-CTA) was synthesized by one-pot reaction with using lignin, carbon disulfide and methyl 2-bromobutyrate as raw materials and was characterized by FT-IR, 1H NMR and 13C NMR spectroscopy, respectively.Then this lignin-CTA was used for performing reversible addition-fragmentation chain transfer polymerization(RAFT) of acrylamide to prepare lignin-acrylamide copolymer(lignin-g-PAM). And the polymerization characteristics of the reaction was studied. In FT-IR spectra of lignin before and after functional modification, the intensity of peak corresponding to hydroxyl group decreased obviously after modification. In addition, the peak at 1148 cm-1 corresponding to CS bond and the peak at 1732 cm-1 corresponding to ester carbanyl groupappeared in the spectrum of lignin-CTA, which indicated that the methyl 2-bromobutyrate was successfully grafted on the lignin. The peak at δ 0.90 in the 1H NMR spectrum of lignin-CTA was corresponded to the protons of end methyl of methyl 2-bromobutyrate and the peak at δ162 in 13C NMR spectrum of lignin-CTA was attrubuted to the carbon atom of -C=S bond. These all proved that methyl 2-bromobutyrate was grafted on lignin successfully. In the RAFT polymerization of acrylamide, number-average molecular weight (Mn) and PDI values vs conversions presented linear relationship and the polydispersity index was low and distributed in a narrow range, indicating that this polymerization process was highly efficient and well controlled. References | Related Articles | Metrics

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Methylene Blue Adsorption onto Hemp Hurd Powder Modified by Potassium Permanganate XU Pengbo, HE Jing, YU Juan, FAN Yimin 2018, 38 (6):  81-87.  doi: 10.3969/j.issn.0253-2417.2018.06.011 Abstract ( 594 )   PDF (846KB) ( 704 )   Save The potassium permanganate modified hemp hurd powder (K-HP) was firstly prepared by oxidation with potassium permanganate. The adsorption performance of hemp hurd powder on methylene blue dye before and after modification were systematically investigated. The effects of initial concentration, adsorption time, adsorption temperature and pH value on adsorption performance were discussed. Results showed that the successful introduction of Mn-O bond into hemp hurd powder and the oxidization of hydroxyl group to the carboxyl group had no effect on the particle structure of hemp. The adsorption capacity of hemp hurd powder increased with the increment of the initial concentration of dye solution, while the dye removal rates decreased. The maximum saturation adsorption capacity for hemp before and after modification was investigated at 25℃, pH value 5 with 0.010 0 g adsorbents added into 10 mL dye solution. HP had the maximum adsorption capacity of 71 mg/g and the equilibrium adsorption time was 30 min. After modification, the maximum adsorption capacity of K-HP increased to 199 mg/g and the equilibrium adsorption time was 60 min. The adsorption performance of HP and K-HP was not affected by temperature within the range of 25-45℃ and the optimal adsorption pH value was 5. The adsorption simulation and fitting results of HP and K-HP conformed to Langmuir isothermal adsorption model, which indicated that the adsorption process was an ideal monolayer adsorption. The adsorption kinetics of methylene blue could be described by the pseudo second-order reaction model, which indicated that the adsorption rate was controlled by chemisorption. References | Related Articles | Metrics

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Destructive Distillation of Chinese Fir Chips and Components of Its Products MENG Binbin, ZHU Kai 2018, 38 (6):  88-94.  doi: 10.3969/j.issn.0253-2417.2018.06.012 Abstract ( 697 )   PDF (565KB) ( 767 )   Save Essential fir oil was prepared by destructive distillation using Chinese fir chips as raw material. The yields of destructive distillation oil, wood vinegar, tar and charcoal were 4.0%, 38.0%, 14.3% and 28.8%, respectively. Non-condensable flammable gas was also generated during destructive distillation, the yield of gas was 15.0%. The property and composition of destructive distillation oil, wood vinegar and non-condensable gas were studied. The results showed that all of the fir chips were converted into products with conversion rate over 80%. The compositions of destructive distillation oil were α-cedrene 29.36%, β-cedrene 11.87%, cedrol 12.10%, etc. The main organic components of the vinegar were 1-methyl-ethylidene-cyclohexane 24.07%, acetic acid 19.77%, 4-ethylguaiacol 11.71%, furfural 8.06%, etc. Main components of non-condensable combustible gas were H2, CO and CH4. References | Related Articles | Metrics

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Adsorption of Chlorogenic Acid from Eucommia ulmoides Leaves on ZSM-5 Molecular Sieve LIU Yunlong, SONG Ke, XIAO Zhuobing, GUO Jie 2018, 38 (6):  95-102.  doi: 10.3969/j.issn.0253-2417.2018.06.013 Abstract ( 485 )   PDF (790KB) ( 727 )   Save The adsorption isotherm, kinetics and thermodynamics of chlorogenic acid in Eucommia ulmoides Oliv. leaves on ZSM-5 molecular sieve was investigated. Batch adsorption experiments revealed that the optimum solid-liquid ratio was 2:20 (g:mL) and pH value was 5. The amount of absorbed chlorogenic acid reached 2.075 mg/g at 40℃.The results of kinetics study showed that the behavior of adsorption of chlorogenic acid on the adsorbent of molecular sieve accorded with the pseudo-second-order kinetic model;the chemisorption played a major role in the adsorption process; and there existed three regions of the diffusion of chlorogenic acid molecules into the molecular sieve depicted from the plot of intraparticle diffusion model, which meant it contained the effects of intraparticle diffusion, external diffusion and boundary diffusion. The result of thermodynamics study showed that theisothermal adsorption curve was more consistent with the Freundlich model, indicating that the adsorption process took place on a heterogeneous surface corresponding to a multilayer adsorption mechanism; the process of adsorption was spontaneous, the enthalpy and entropy were 40.13 kJ/mol and 157.58 J/(mol·K), respectively, which meant endothermic and entropy increased during the adsoption process. References | Related Articles | Metrics

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Preparation and Characterization of Lignin Based Phenolic Foam ZHOU Fanglang, ZHENG Zhifeng, YANG Jing, YANG Haiyan, DENG Jia, SHI Zhengjun 2018, 38 (6):  103-109.  doi: 10.3969/j.issn.0253-2417.2018.06.014 Abstract ( 567 )   PDF (1394KB) ( 704 )   Save Lignin was used to partially replaced phenol andreact with formaldehyde to form a lignin based phenolic resin under alkaline condition. Then this lignin based phenolic resin was applied to prepared a foam by foaming process. When the replacement percentages of phenol by lignin were 0%, 10%, 20%, and 30%, the phenolic foams were denoted as LPF-0%, LPF-10%, LPF-20%, LPF-30%, respectively. The research results on the properties of phenolic foams showed that lignin could partially replace the phenol and carry out condensed reaction with formaldehyde to form phenolic resin. Four kinds of lignin-based phenolic foam had good thermal stability.The maximum carbon residue of foam was 54.60% when the replacement percentage of phenol by lignin was 20% (LPF-20%), and the thermal stability was better than other phenolic foams. As the substitution amount of lignin increased, the color of lignin-based phenolic foam gradually changed from yellow to brown,its density increased from 0.05 g/cm3 to 0.11 g/cm3, and the compressive strength increased from 0.26 MPa to 0.56 MPa, the degree of surface power decreased from 13.73% to 3.48%, and the water absorption rate decreased from 3.73% to 1.92%.Lignin-based phenolic foam showed a good flame retardant property and the oxygen index of LPF-30% was as high as 33.67%. References | Related Articles | Metrics

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Synthesis and Characterization of 3'-(3,3-Dimethylbicyclo[2.2.1] hept-2-ylidene)-5'-phenyl-isoxazoline HUANG Jing, BAO Han, ZHANG Xia, MO Yue, LUO Jinyue, LIU Zuguang 2018, 38 (6):  110-116.  doi: 10.3969/j.issn.0253-2417.2018.06.015 Abstract ( 446 )   PDF (1150KB) ( 646 )   Save The unreported 3'-(3,3-dimethylbicyclo[2.2.1] hept-2-ylidene)-5'-phenyl-isoxazoline was synthesized by cycloaddition reaction of 2-(3,3-dimethylbicyclo[2.2.1] heptan-2-ylidene)acetaldehyde oxime (camphene aldoxime, CAO) and syrene. The structure of the product was identified by FT-IR, GC-MS, 1H NMR and 13C NMR. The effects of the types of solvent, type and dosage of catalyst, amount of oxidant Oxone, dosage of syrene and reaction time on reaction rate and product yield were discussed. The optimum conditions were obtained as follows:potassium chloride as the catalyst, 50% methanol as solvent, n(camphene aldoxime):n(potassium chloride):n(Oxone):n(syrene)=1.0:0.5:1.5:2.0, reaction time 10 h. Under the above conditions, the product yield was 88.07%. References | Related Articles | Metrics

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Synthesis and Anticancer Activity of Dehydroabietyl Primary Amine Derivatives QI Zhiwen, WANG Chengzhang, JIANG Jianxin 2018, 38 (6):  117-123.  doi: 10.3969/j.issn.0253-2417.2018.06.016 Abstract ( 518 )   PDF (708KB) ( 637 )   Save The primary amine derivatives of dehydroabietic acid:dehydroabietic amide formic acid (1), dehydroabietic amide acetic acid (2), dehydroabietic amide propionic acid (3) and dehydroabietic amide butyric acid (4) were synthesized by a simple and efficient one-pot method with levopimaric acid (0.3 mmol) as raw material, triethylamine (TEA) as base, 1-(3-dimethylamino propyl)-3-ethyl carbodiimide hydrochloride (EDCI) as dehydrant, 1H benzotriazole-1-yl-oxytripyrrolidinophosphonium hexafluorophosphate/4-dimethylamino pyridine (n(PyBOP):n(DMAP)=0.03 mmol:0.01 mmol) as catalyst and acetonitrile as solvent. The yield of the compound 3 were up to 78%. The compound 3 modified by primary amine had a high proliferation inhibitory activity toward human gastric cancer MKN-45 cell line with the IC50 of 31.26 μmol/L. References | Related Articles | Metrics

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Preparation of Rice Husk Based Super Absorbent Polymer and Its Effect on Growth and Development of Elymus nutans Seed ZHANG Xiaozhou, LIANG Meng, YANG Yan, JIA Hongge 2018, 38 (6):  124-128.  doi: 10.3969/j.issn.0253-2417.2018.06.017 Abstract ( 474 )   PDF (598KB) ( 439 )   Save The rice hull-based super absorbent polymer (SAP) was prepared with rice husk as raw material. The preparation conditions were optimized by orthogonal test, and its structure was characterized by infrared spectroscopy. The effects of addition of different amounts of SAP on the emergence rate of Elymus nutans and the dry and fresh weight during plant growth were further analyzed. The results showed that the amount of cross-linking agent had the greatest influence on the water absorption rate of SAP. Under the conditions of the rice hull content was 20%, the mass ratio of monomeric acrylic acid (AA) and acrylamide (AM) was 3:5, and the acrylic acid neutralization degree was 75%, the initiator accounted for 0.56% of the monomer amount and the crosslinking agent accounted for 0.34% of the monomer amount, the prepared SAP water absorption rate could reach 120 g/g. It was found that the emergence rate of E. nutans and the dry and fresh weight of the plants after adding SAP were significantly higher than those of the blank control group by planting experiments. The emergence rate and the dry and fresh weight of the plants were significantly improved with the addition of SAP. When the SAP dosage was 12 g/m2, they gradually became stable, and the comprehensive effect was the best. At this time, the emergence rate was 85.9%, which was 2.74 times of that of the blank control group; the dry and fresh weights of the plants were 2 times and 3.375 times of that of the blank control group, respectively. It indicated that the SAP prepared in the present study could effectively increase water content of soil, emergence rate of seed and the dry matter accumulation of plant. References | Related Articles | Metrics