巨龙竹全组分乙酰化膜的制备与性能表征
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摘要
选用云南省一种具有极大开发利用价值的大型丛生竹——巨龙竹作为研究对象,竹粉经1-甲基咪唑/二甲基亚砜(NMI/DMSO)溶剂体系预处理后,加入过量乙酸酐,得到的乙酰化原料用于制备全组分基膜材料,并引入增塑剂聚乙二醇(PEG)进一步对膜性能进行改性.经原料组分含量测定、红外光谱、紫外光谱、扫描电镜、力学性能和亲水性测定对膜材料表征分析.结果表明:乙酰化原料木质素、纤维素、半纤维素的质量分数分别为:22.3%、63.2%和13.6%,说明三大组分都得以有效利用,红外光谱进一步验证了乙酰化反应取代羟基效果明显;基膜紫外光区透过率为零,可见光区透过率也较低,但随着聚乙二醇添加量的增大,透光率增大;改性后的膜力学性能大幅提高,加入50%聚乙二醇的膜力学性能最优,拉伸强度提高了168%,伸长率提高了250%;接触角数值可以看出,聚乙二醇的添加使得膜亲水性能变好.
Dendrocalamus sinicus,which is of great value for development and utilization in Yunnan Province,was selected as the research object.Bamboo powder was pretreated with an NMI/DMSO(1-methylimidazole/dimethyl sulfoxide)solvent system,and acetylation was performed by adding acetic anhydride to carry out acetylation reaction.Acetylated raw materials were used to prepare an all-component membrane and plasticizer polyethylene glycol(PEG)was used to modify the material.Through the determination of raw material composition,infrared spectroscopy,ultraviolet spectroscopy,contact angle,scanning electron microscopy and mechanical property testing,the membrane material was characterized.The contents of lignin,cellulose and hemicellulose of the acetylated raw material were shown to be 22.3%,63.2%and 13.6%respectively,demonstrating that all the three major components of bamboo were well utilized.Fourier transform infrared(FTIR)spectroscopy indicated that the acetylation reaction had an obvious effect on the substitution of hydroxyl groups.The UV transmittance of the base film was zero,and the visible light area transmittance was also low,but with the increase in the amount of the polyethylene glycol added,the transmittance of the membrane increased.The mechanical properties of the modified film were significantly improved.The addition of 50% PEG gave the best results,with an increase in tensile strength by 168%and in elongation by 250%.Contact angle measurement proved that the addition of polyethylene glycol made the hydrophilic properties of the film better.
Dendrocalamus sinicus,which is of great value for development and utilization in Yunnan Province,was selected as the research object.Bamboo powder was pretreated with an NMI/DMSO(1-methylimidazole/dimethyl sulfoxide)solvent system,and acetylation was performed by adding acetic anhydride to carry out acetylation reaction.Acetylated raw materials were used to prepare an all-component membrane and plasticizer polyethylene glycol(PEG)was used to modify the material.Through the determination of raw material composition,infrared spectroscopy,ultraviolet spectroscopy,contact angle,scanning electron microscopy and mechanical property testing,the membrane material was characterized.The contents of lignin,cellulose and hemicellulose of the acetylated raw material were shown to be 22.3%,63.2%and 13.6%respectively,demonstrating that all the three major components of bamboo were well utilized.Fourier transform infrared(FTIR)spectroscopy indicated that the acetylation reaction had an obvious effect on the substitution of hydroxyl groups.The UV transmittance of the base film was zero,and the visible light area transmittance was also low,but with the increase in the amount of the polyethylene glycol added,the transmittance of the membrane increased.The mechanical properties of the modified film were significantly improved.The addition of 50% PEG gave the best results,with an increase in tensile strength by 168%and in elongation by 250%.Contact angle measurement proved that the addition of polyethylene glycol made the hydrophilic properties of the film better.
引文
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[2]与所查不符.严东辉,董娜,王凯英,等.树木内生真菌转化农林废弃物直接生产生物燃料新途径---"水解纤维素产烃树木内生真菌资源利用技术引进"项目成果[J].科技成果管理与研究,2017,12(5):80-81.
[3]GOPAKUMAR D A,MANNA S,PASQUINI D,et al.Nanocellulose:Extraction and Application as a Sustainable Material for Wastewater Purification[J].New Polymer Nanocomposites for Environmental Remediation,2018,21(7):469-486.
[4]MARZORATI S,SCHIEVANO A,COLOMBO A,et al.Ligno-Cellulosic Materials as Air-Water Separators in LowTech Microbial Fuel Cells for Nutrients Recovery[J].Journal of Cleaner Production,2018,170(1):1167-1176.
[5]凡祖伟.编织管增强型醋酸纤维素中空纤维膜研究[D].天津:天津工业大学,2016.
[6]SANTOS D C,RIBEIOR-SANTOS R,VENTURA L A F,et al.Antimicrobial Activity Studies and Characterization of Cellulose Acetate Films Containing Essential Oils[J].Italian Journal of Food Science,2016,28(2):248-257.
[7]王丽莉,欧阳土龙,戴兴兴,等.过氧化氢漂白富纤维素材料制备透明纤维素膜研究[J].森林工程,2018,34(1):41-45,59.
[8]ZHANG X Q,ZHANG A P,LIU C F,et al.Per-O-Acylation of Xylan at Room Temperature in Dimethylsulfoxide/N-Methylimidazole[J].Cellulose,2016,23(5):2863-2876.
[9]袁腾.超亲水超疏油复合网膜的制备及其油水分离性能研究[D].广州:华南理工大学,2015.
[10]JAVID A,KUMAR M,WEN L,et al.Surface Energy and Wettability Control in Bio-Inspired PEG Like thin Films[J].Materials&Design,2016,92(1):405-413.
[11]SLUITER A,HAMES B,RUIZ R,et al.NREL/TP-510-42618,Determination of Structural Carbohydrates and Lignin in Biomass:Laboratory Analytical Procedure(LAP)[S].Golden,Colorado:National Renewable Energy Laboratory,2008:12-42.
[12]ZASADOWSKI D,YANG J,EDLUND H,et al.Antisolvent Precipitation of Water-Soluble Hemicelluloses from TMPProcess Water[J].Carbohydrate Polymers,2014,113(1):411-419.
[13]刘峙嵘,刘大前,王长福,等.腐秆剂快速分解的水稻秸秆活性成分分析与红外光谱表征[J].江苏农业科学,2018,46(1):189-192.
[14]黄曹兴,何娟,闵斗勇,等.毛竹竹青和竹黄半纤维素的提取与结构表征[J].林产化学与工业,2015,35(5):29-36.
[15]邢山川.生物质中纤维素的提取及功能化研究[D].石家庄:河北科技大学,2018.
[16]杨凯元,王丽熙,张其土.多波段吸收PC滤光镜片的制备与性能研究[J].功能材料,2015,46(19):106-109.
[17]HE B,Lee J,PATANKAR N A.Contact Angle Hysteresis on Rough Hydrophobic Surfaces[J].Colloids&Surfaces APhysicochemical&Engineering Aspects,2016,248(1):101-104.