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    25 February 2018, Volume 38 Issue 1 Previous Issue    Next Issue
    Research Progress of Cellulose Conductive Aerogels and Composites in Supercapacitors
    YANG Xi, KONG Lingyu, LIU Xing'e, MA Jianfeng, JIANG Zehui
    2018, 38 (1):  1-8.  doi: 10.3969/j.issn.0253-2417.2018.01.001
    Abstract ( 503 )   PDF (1604KB) ( 863 )   Save
    The technical means that the cellulose aerogels achieving electrically conductive function by carbonization and combining conductive materials and their application in supercapacitors were summarized.The effects of pore structure and hybrid structure of cellulose conductive aerogels on the electrochemical properties were also introduced.This review also detailed the latest researches on improving electrical double-layer capacitor properties by controlling the pore structure according to the electrolyte ionic size;on compositing high conductive material (graphene);on taking advantages of excellent electrical conductivity and high structural stability in carbon aerogel together with the large capacitance and high energy density in metal compounds to achieve the synergistic effect of electric double layer capacitance and pseudocapacitance.Additionally,the prospects of the opportunities and challenges in the fabrication and energy-storage application of cellulose conductive materials were elucidated.
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    Preparation of Hydrophobic Cellulose Aerogel Beads and Its Adsorption Performance
    LIU Zhiming, WU Peng
    2018, 38 (1):  9-17.  doi: 10.3969/j.issn.0253-2417.2018.01.002
    Abstract ( 471 )   PDF (4814KB) ( 516 )   Save
    Take NaOH/urea aqueous system as solvent,hydrophobic cellulose aerogel beads (HCAB) were fabricated by the process of droplet suspension gelation,freeze-drying and surface silylanization.Morphology,chemical state,crystal form and pore structure of HCAB were characterized and analyzed by scanning electron microscopy (SEM),fourier transform infrared spectroscopy (FT-IR),X-ray diffraction (XRD),X-ray photoelectron spectroscopy (XPS) and BET method.Meanwhile,wettability and adsorption performance of HCAB were measured by the contact angle and oil adsorption test.The results showed that the silation caused no change to microscopic feature and crystalline structure of original regenerated cellulose aerogel beads (UCAB),this reaction occurs only in the surface of hydrophilic hydroxyl groups of cellulose,hydrophilic cellulose aerogel beads with good hydrophobic properties.The performance density and total pore volume of HCAB was 17.6 mg/cm3and 56.11 cm3/g,respectively.At the same time HCAB possessed well adsorptive selectivity for non-polar solvent in the test of adsorption,the absorbing capacity to different density of non-polar solvent such as n-hexane,toluene,chloroform and so on was in the range of 30-60 g/g.Besides HCAB also possessed well reusability,the adsorbing capacity to methylbenzene was stable in 40 g/g in 5 times of adsorption-desorption,and maintained high structure stability.
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    Preliminary Study of Identification of Different Kind Activated Carbon from Coconut Shell,Almond Shell and Coal by Stable Isotope Ratio Technique
    WANG Pengfei, SHEN Juanzhang, TAN Weihong
    2018, 38 (1):  18-24.  doi: 10.3969/j.issn.0253-2417.2018.01.003
    Abstract ( 435 )   PDF (1145KB) ( 317 )   Save
    The study is about the identification of activated carbon,which was made by vapor activation,from coconut shell,almond shell and coal was preliminarily studied by stable isotope ratio technique.Statistical Package for the Social Sciences (SPSS) statistics of 65 kinds of activated carbon found that the δ13C values of coal-based activated carbon,the almond shell activated carbon and the coconut shell activated carbon were -24.3‰--22.1‰,-25.9‰--24.4‰ and -25.7‰--24.6‰,respectively.Further studies analyse of the relationship between δ13C and δ18O,δ13C and δ2H,the δ13C value asvertical axis showed that the δ13C values of different kinds of activated carbon were located in different interval.The δ13C values of coal-based activated carbon were above Y=-24.325,which could distinguish clearly from almond shell and coconut shell activated carbon.Between Y=-25.031 and Y=-24.325.The most part of δ13C values of the almond shell activated carbon were Y=-25.031--24.325 and those of the coconut shell activated carbon were below Y=-25.031.Although the interval of coconut shell and almond shell activated carbon were different,but part of those were overlap.According to this model,the correct classification of activated carbon from coal,almond shell and coconut shell were 100%,40% and 90.32%.
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    Quantitative Research on Solubility Property of Straw Wheat Alkali Lignin
    NI Haiyue, REN Shixue, FANG Guizhen, MA Yanli, LIU Xiaole
    2018, 38 (1):  25-32.  doi: 10.3969/j.issn.0253-2417.2018.01.004
    Abstract ( 478 )   PDF (597KB) ( 340 )   Save
    For quantitative characterizing the solubility properties of wheat straw alkali lignin,the solubility parameters were measured by inverse gas chromatography (IGC) and Hansen solubility parameter (HSP) method.By IGC method,the solubility parameter (δ2) and the related thermodynamic properties of wheat straw alkali lignin were determined in 403.15-443.15 K;wheat straw alkali lignin was used as the stationary phase,and 7 classes of 20 kinds of organic solvents,namely aliphatic,cycloaliphatic,aromatic hydrocarbons,alcohols,ketones,halohydrocarbons and tetrahydrofuran totally 7 classes of 20 kinds of organic solvents were used as the probe molecules;the δ2 was derived as 20.09(J/cm3)0.5 at 298.15 K by linear extrapolation and the δ2 increased with the increase of temperature in 403.15-443.15 K.By HSP method,the solubility parameter (δT) was measured as 20.68(J/cm3)0.5 at 298.15 K.The δ2 and δT values were consistent by IGC and HSP method.And tetrahydrofuran,alcohols and ketones had a good trend of solving straw alkali lignin.
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    Preparation of Chaenomeles speciosa Seed Oil Microcapsule by Spray Drying Technology and Its Properties
    DENG Yejun, HUANG Lixin, ZHANG Caihong, XIE Pujun, DING Shasha, WANG Xiaojie
    2018, 38 (1):  33-38.  doi: 10.3969/j.issn.0253-2417.2018.01.005
    Abstract ( 366 )   PDF (958KB) ( 239 )   Save
    Based on the single-factor experiments,orthogonal experiment was used to optimize the technical parameters for preparing Chaenomeles speciosa(Sweet) Nakai seed oil microcapsules and the optimum technical paramenters were as follows:homogeneous pressure 30 MPa,inlet temperature 190℃,feeding rate 16 mL/min.The microcapsules produced under these processing parameters were determined as canary yellow powders,with microencapsulation efficiency 83.59%,water content 2.51%,density 0.625 g/cm3,hygroscopicity 9.191%,and particle size 39.440 μm.The microcapsule powders observed by SEM were found to have regular spherical shape with smooth surface and compact structure.The results of storage stability study showed that the microcapsules were more stable against oxidation in air than the oil which was not entrapped.The properties of microcapsule products were excellent,and the shelf life of C.Speciosa seed oil was greatly extended.
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    Synthesis and Properties of Gallic Acid-based Non-isocyanate Polyurethanes Modified with Polysiloxane
    LIU Guifeng, WU Guomin, CHEN Jian, KONG Zhenwu
    2018, 38 (1):  39-46.  doi: 10.3969/j.issn.0253-2417.2018.01.006
    Abstract ( 445 )   PDF (2606KB) ( 336 )   Save
    A cyclic carbonate-functionalized polysiloxane (CCPS) was successfully synthesized by hydrosilylation of poly (methylhydrosiloxane)(PMHS) with allyl glycidyl carbonate (AGC) by using H2PtCl6 as catalyst.The CCPS was subsequently incorporated into gallic acid-based non-isocyanate polyurethane (GNIPU) networks to form GNIPU-CCPS composites.The chemical structure of CCPS was characterized by FT-IR,1H NMR and 13C NMR,as well as,the effects of CCPS on mechanical and thermal properties of GNIPU were investigated.The GNIPU-CCPS coatings exhibited excellent properties such as flexibility (0.5 mm),adhesion (grade 1) and impact strength (≥ 50 kg·cm).Furthermore,with the increase of CCPS content,the thermal stability,flexibility and water resistance of the coatings were increased,while the glass transition temperature and pencil hardness of the coatings were decreased.
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    The Effect of Mixed Alcohols on Physical Properties of Bio-oil
    WANG Shuyang, LIU Xinhao, WU Yunpeng, JIANG Ziqi, TAN Wenying
    2018, 38 (1):  47-52.  doi: 10.3969/j.issn.0253-2417.2018.01.007
    Abstract ( 403 )   PDF (536KB) ( 291 )   Save
    In order to improve the physical properties and stability of bio-oil,the mixed alcohol of methanol and ethanol with the mass ratio of 1:1 as additive was added different mass fraction into the bio-oil obtained from fast pyrolysis of agricultural and forestry wastes as the sample.And the effect of different mass fraction of additive on the main physical properties of bio-oil,such as kinematic viscosity,water content,heat value,flash point,density and pH value were studied.The experimental results showed that the mixed alcohol could improve the physical properties of bio-oil.As the additions amount of 5%-40%,the kinematic viscosity of bio-oil increased by 1.289-2.049 mm2/s,the moisture content decreased by 10.07%-44.75%,the calorific value increased by 1.70%-11.14%,the flash point decreased by 1.99%-14.44%,the density decreased by 1.56%-12.23%,the pH value increased by 8.51%-70.21%,and the rate of change reduced,which indicated the physical properties of bio-oil could be improved by adding the mixed alcohol.
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    Improving Conversion of Glucose Dehydration to 5-Hydroxymethylfurfural Catalyzed by Solid Acid in γ-Valerolactone/Water with NaCl as Promoter
    ZHANG Qilin, WANG Chao, ZHANG Xueming, YANG Guihua, XU Feng
    2018, 38 (1):  53-58.  doi: 10.3969/j.issn.0253-2417.2018.01.008
    Abstract ( 557 )   PDF (544KB) ( 322 )   Save
    The degradation of glucose to produce 5-hydroxymethylfurfural (HMF),which was catalyzed by solid Brønsted acid (Amberlyst 36) with the alkali metal salts as promoters,was studied in the γ-valerolactone (GVL)/water solvent system.In particular,the effects of several elements such as different kinds and concentrations of salts,residence time,temperature,dosage of catalyst and solvent ratio of system on the conversion of glucose to HMF were investigated emphatically.The maximum yield of HMF (47.5%) was obtained under the conditions of 140 ℃,the NaCl concentration 0.3 mol/L,the solvent ratio of GVL and H2O (V(GVL):V(H2O))5:1 and 60 min.Adding alkaline metal salts resulted in a great enhancement in glucose conversion generally whereas the existence of nitrate was detrimental to HMF generation.However,the extremely high temperature,excessive catalyst dosage and residence time would lead to a negative effect on the yield of HMF.Biomass such as xylose residues in this system could be converted directly to HMF with reasonable yield of 32.5 %,which suggests that this system is potential to be industrialized.
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    Synthesis and Characterization of Self-reinforced Cellulose Nanocrystals Based Thermoplastic Elastomers by SI-ATRP
    LU Chuanwei, GUO Tengfei, WANG Chunpeng, CHU Fuxiang, WANG Jifu
    2018, 38 (1):  59-65.  doi: 10.3969/j.issn.0253-2417.2018.01.009
    Abstract ( 393 )   PDF (1085KB) ( 274 )   Save
    Degreasing cotton was used to prepare an initiator for surface-initiated atom transfer radical polymerization (SI-ATRP).Subsequently,SI-ATRP of tetrahydrofurfuryl methacrylate (THFMA) and lauryl methacrylate (LMA) was carried out in the presence of sacrificial initiator (EBiBr) to prepared self-reinforced CNCs based thermoplastic elastomers (CTPEs).FT-IR,1H NMR and GPC were applied to characterize the structure of CTPEs.DSC analysis showed that the glass transition temperature (Tg) of CTPEs was increased from-0.04℃ to 22.58℃ with the increasing of THFMA content.Mechanical properties test showed that the tensile strength was increased from 0.14 MPa to 6.17 MPa with the increasing of THFMA content in the feeding.And compared to the linear copolymer P (LMA-co-THFMA) which has the same THFMA/LMA composition,the tensile strength of CTPEs was increased by 3 times,which indicated that CNCs could greatly improve the mechanical properties of CTPEs.
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    Effect of Metal Elements on Integrated Process for Hydrogen Production from Biomass
    DING Ding, YAN Bochao, ZHANG Suping
    2018, 38 (1):  66-72.  doi: 10.3969/j.issn.0253-2417.2018.01.010
    Abstract ( 360 )   PDF (589KB) ( 339 )   Save
    The effects of different metals (K,Ca,Mg,Fe,Zn) on hydrogen yield,gas composition and carbon conversion were studied based on the integrated hydrogen production process from corn cob.The catalytic activities of different metal elements were found as the following sequence:K > Fe > Mg > Ca > Zn.Particularly,K showed the best catalytic effect with the carbon conversion of 85.65% and then,the effects of K on pyrolysis and gasification processes were discussed in detail.The results showed that the addition of K could promote the conversion of biomass during pyrolysis and gas-solid simultaneous gasification process.The carbon conversion were improved by 5.31 and 10.30 percent points in each step,respectively.Potential hydrogen yield of 86.97 g/kg and carbon conversion of 90.11% were achieved under the pyrolysis temperature of 600℃ and gas-solid simultaneous gasification temperature of 850℃.With the increase of temperature,the yield of biomass carbon decreased and the loss of K increased,which reached 13.56% and 74.44%,respectively at 850℃.
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    Antioxidant Activity of Sesquiterpenes from Cryptoporus volvatus (Peck) Hubbard
    ZHOU Lingyun, LU Bin, YU Xiaohong, ZHANG Mingrui, HUA Yan
    2018, 38 (1):  73-80.  doi: 10.3969/j.issn.0253-2417.2018.01.011
    Abstract ( 422 )   PDF (877KB) ( 249 )   Save
    The antioxidant activities of four extracts (alkali extracts,ethyl acetate extract,60% ethanol extract and crude polysaccharide) from Cryptoporus volvatus(Peck) Hubbard were evaluated by methods of 1,1-diphenyl-2-picrylhydrazyl (DPPH) radical,2,2'-azino-di-(3-ethyl-2,3-dihydrobenzthiazoline-6-sulfonate)(ABTS),Salicylic acid,and Fenton reaction.The results indicated that ethyl acetate extract showed the strongest free radical scavenging ability with IC50=(67.43±1.41) mg/L by the ABTS method.Further study by bioassay-guided fractionation of the ethyl acetate extract led to the isolation and identification of nine cryptoporic compounds including cryptoporic acid A trimethyl ester (1),cryptoporic acid A (2),cryptoporic acid D tetra-methyl ester (3),cryptoporic acid D (4),cryptoporic acid C (5),cryptoporic acid C pentamethyl ester (6),cryptoporic acid E pentamethyl ester (7),cryptoporic acid B trimethyl ester (8) and crytoporic acid B (9).Among them,compounds 1,3,6,8 were isolated for the first time from this fungus.The results of the ABTS scavenging ability showed that compound 8(cryptoporic acid B trimethyl ester) has a higher antioxidant activity with IC50=(5.29±0.25) mg/L than the positive control VC with IC50=(5.76±0.58) mg/L.In addition,the structure-relationship of sesquiterpenes as antioxidant agents was analyzed.
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    Antimidew and Antibacterial Characteristics of Larix Bio-oil
    CHEN Chao, YU Yuxiang, HAN Liping, XING Jingchen, CHANG Jianmin
    2018, 38 (1):  81-86.  doi: 10.3969/j.issn.0253-2417.2018.01.012
    Abstract ( 418 )   PDF (530KB) ( 303 )   Save
    To evaluate the antimidew and antibacterial characteristics of bio-oil,the main volatile chemical components of Larix bio-oil were analyzed by GC-MS,and the filter paper and agar dilution methods were used to evaluate their antimidew and antibacterial effects on three common wood molds (Aspergillus niger,Penicillium citrinum and Trichoderma viride).The results showed that the Larix bio-oil contained a variety of antimicrobial components,such as phenols (34.59%),ketones (17.53%),aldehydes (11.31%),esters (6.66%),alcohols (6.55%),organic acids (6.04%),and etc.The maximum diameters of the bacteriostatic circles of Larix bio-oil for A.niger,P.citrinum and T.viride were 15.67,19.67 and 14.28 mm,respectively and the bacteriostatic circles were not found in the contrast samples indicated that the Larix bio-oil has good bacteriostatic effect.With the increase of bio-oil volume fraction,the inhibitory rates of 3 kinds of fungi increased,the minimum inhibitory concentration of three kinds of mould was 25% by agar dilution method.
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    Preparation and Antioxidant Properties of Dehydrogenation Polymer of Isoeugenol
    CHEN Xuekuan, ZHAO Houkuan, WU Hongfei, YE Zhezi, XIE Yimin
    2018, 38 (1):  87-92.  doi: 10.3969/j.issn.0253-2417.2018.01.013
    Abstract ( 459 )   PDF (878KB) ( 277 )   Save
    The lignin dehydrogenation polymers (DHP) were prepared using lignin precursor isoeugenol as raw material and laccase as catalyst.The structure of DHP was characterized by FT-IR,13C NMR spectroscopy and GPC.The antioxidant activity of DHP was also studied by investigating the effect of the product on the half inhibitory concentration (IC50) of diphenyl picrylhydrazyl radical (DPPH·) and on retarding the oxidation of β-carotene.The results showed that the structure of DHP was similar to the Ginkgo milled wood lignin (MWL).The 13C NMR spectrum showed that the typical lignin substructures such as β-5,β-O-4,β-1,β-β exist in the DHP.The content of free phenolic hydroxyl in DHP decreased with the increase of molecular weight.After classification,it was found that the ether-soluble fraction (DHP①) had the best antioxidant properties.The IC50 value of this fraction was only 0.12 g/L.The increase of the volume or concentration of DHP could improve the ability of inhibition of oxidation of β-carotene.
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    Pyrolysis Characteristics and Kinetics of Chinese Silvergrass and Corn Stalk Based on Iso-conversional Methods
    YAO Can, TIAN Hong, QIN Jingping, LIU Zhengwei, HU Zhangmao
    2018, 38 (1):  93-100.  doi: 10.3969/j.issn.0253-2417.2018.01.014
    Abstract ( 492 )   PDF (770KB) ( 275 )   Save
    The pyrolysis characteristics of Chinese silvergrass and corn stalk at different heating rates (5,10,20 and 40℃/min) were studied by thermogravimetric analysis.Pyrolysis kinetics were studied using Kissinger-Akahira-Sunose (KAS),Starink and Ozawa integration method.The TG and DTG curves demonstrated that the pyrolysis process of Chinese silvergrass and corn stalk could be divided into 4 stages:dehydration stage,transition stage,main pyrolysis stage and carbonization stage.Along with the increase of heating rate,the pyrolysis curves moved to the high temperature side,and the rate of weight loss increased,which indicated that the increase of heating rate could promote the pyrolysis reaction.The results of pyrolysis of Chinese silvergrass showed that the correlation coefficients of the three methods were more than 0.9,and the values of activation energy calculated by KAS and Starink methods were very close to each other,but the activation energy calculated by Ozawa method was lower.The activation energy of corn stalk pyrolysis obtained by Ozawa method was the highest,followed by that of Starink method and KAS method.The activation energies of Chinese silvergrass pyrolysis obtained by three methods fluctuated obviously with the increase of conversion rate in the whole pyrolysis process,which showed that a series of complex chemical reactions occurred in the pyrolysis process.When the conversion rates were 0.1-0.4,the activation energy of corn stalk pyrolysis increased sharply;but when the conversion rates were 0.4-0.8,the activation energy of corn stalk pyrolysis decreased slowly until it reached a plateau.The conversion rates of 0.1-0.3,0.3-0.7 and 0.7-0.8 corresponded to the main pyrolysis stage of hemicellulose,the main pyrolysis of cellulose,and the main pyrolysis stage of lignin,which indicated that the pyrolysis difficulty degree of the three components in Chinese silvergrass was the order of lignin > cellulose > hemicellulose.
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    Synthesis of Phenol-urea-formaldehyde Resin and Its Reaction Mechanism
    WANG Rongxing, ZHANG Zuxin, CHEN Riqing, ZHAO Linwu, WANG Chunpeng, CHU Fuxiang
    2018, 38 (1):  101-109.  doi: 10.3969/j.issn.0253-2417.2018.01.015
    Abstract ( 712 )   PDF (1082KB) ( 443 )   Save
    Phenol-urea-formaldehyde (PUF) resin wood adhesives with different amount of urea instead of phenol were synthesized.and a simple phenol-urea-formaldehyde resin formulation and synthesis technology was investigated.The bonding strength of the five PUF pressed plywoods with different dosage of urea all met the requirements of classⅠ.The cure,decomposition and reaction processes of PUF resin were characterized by 13C NMR and TG respectively.13C NMR showed the content of hydroxymethyl,methylene and methylene ether bonds in PUF resin varied with the amount of urea and the reaction time during the preparation.Furthermore,the reaction mechanism of PUF synthesis was analyzed and the heat resistance of the synthesized PUF resin was characterized by TG.The results showed that the synthesis process of PUF resin was the electrophilic addition of formaldehyde and the thermostability firstly increased and subsequently reduced.
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    Synthesis of Isobornyl Acetate from Camphene Isomeric Esterification Catalyzed by Lewis Acids
    CUI Juntao, YANG Yuzhen, LIANG Xinghua, ZHAO Zhendong, HUANG Jinlong
    2018, 38 (1):  110-114.  doi: 10.3969/j.issn.0253-2417.2018.01.016
    Abstract ( 1021 )   PDF (655KB) ( 524 )   Save
    Isomeric esterification of camphene with glacial acetic acid catalyzed by Lewis acids was studied to produce isobornyl acetate.And the suitable esterification conditions were examined and optimized as following:FeCl3 as catalyst,catalyst dosage 10%(mass ratio of camphene),reaction temperature 25℃,reaction time 2 h,n(camphene):n(acetic acid)1:3.As results,using 94.9% camphene (the total of camphene 84.8% and tricyclene 10.1%) as raw material,the conversion rate of camphene was nearly 99%,the selectivity of isobornyl acetate reached 94%,and the yield of isobornyl acetate reached more than 88% in the product.
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    Synthesis,Characterization and Properties of Amphoteric Polymeric Surfactant CHPDMDHA-g-N,O-CMC
    LI Man, PEI Lijun, CAI Zhaosheng, FANG Guigan
    2018, 38 (1):  115-120.  doi: 10.3969/j.issn.0253-2417.2018.01.017
    Abstract ( 433 )   PDF (757KB) ( 418 )   Save
    3-Chloro-2-hydroxypropyl dimethyl dehydroabietyl ammonium chloride grafted N,O-carboxymethyl chitosan oligosaccharide (CHPDMDHA-g-N,O-CMC) was obtained through the grafting reaction between 3-chloro-2-hydroxypropyl dimethyl dehydroabietyl ammonium chloride (CHPDMDHA) and N,O-carboxymethyl chitosan oligosaccharide (N,O-CMC) with 25% NaOH aqueous solution as catalyst.The structure of CHPDMDHA-g-N,O-CMCs was confirmed by FT-IR and 1H NMR,and the grafting degree (DQ) of CHPDMDHA-g-N,O-CMCs was determined by elemental analysis.The critical micelle concentration (CCMC) and surface tension (γCMC) were determinated according to the variation of the surface tension of CHPDMDHA-g-N,O-CMCs in aqueous solution with the concentration.The emulsifying power of CHPDMDHA-g-N,O-CMCs was investigated according to the stability time of emulsion which was formed by oscillametric method and composed of water and benzene.The experimental results showed when the grafting degrees of CHPDMDHA-g-N,O-CMCs were 18.7%,21.5% and 23.1%,the critical micelle concentrations were 4.82×10-4,1.33×10-4 and 7.50×10-5 mol/L,the surface tensions at cmc ware 35.1,33.7 and 32.7 mN/m,respectively.The stability time of emulsion composed of 1.0 g/L CHPDMDHA-g-N,O-CMC,whose DQ was 23.1%,aqueous solution and benzene at the same volume was up to 195s,which was the longest one among CHPDMDHA-g-N,O-CMC3,sucrose stearate and monoglyceride.
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    Effect of Laccase Pretreatment on Extract of Bagasse Hemicellulose
    LI Jiaoyang, HUANG Jizhen, LIU Yuxin, SUN Bing, LIANG Xing, ZHANG Bao
    2018, 38 (1):  121-126.  doi: 10.3969/j.issn.0253-2417.2018.01.018
    Abstract ( 434 )   PDF (4189KB) ( 321 )   Save
    A novel laccase pretreatment was developed to enhanced hemicelluloses extraction from bagasse by microwave-assistedalkali extracting method.The morphology and porosity characterization of bagasse and relative molecular weight of hemicelluloses were characterized by scanning electron microscope,surface and aperture analyzer and gel permeation chromatograph.The results indicated that the surface structure of bagasse was fractured and a number of holes were discovered after laccase pretreatment,and the total pore volume and surface area were increased by 26.7% and 90.5%,respectively.The maximum yield of hemicelluloses (approximately 89.0%) and higher molecular weights were obtained under the conditions of the dosage of laccase 160 U/g,sodium hydroxide concentration 8%,microwave power 800 W and extraction time 50 min,ratio of solid and liquid 1:20,extraction temperature 90℃.
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