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机械活化甘蔗渣制备羧甲基纤维素及性能表征
引用本文:陈渊,韦庆敏,杨家添,朱万仁,余桂英,黄祖强.机械活化甘蔗渣制备羧甲基纤维素及性能表征[J].农业工程学报,2015,31(23):300-307.
作者姓名:陈渊  韦庆敏  杨家添  朱万仁  余桂英  黄祖强
作者单位:1. 玉林师范学院化学与材料学院;,1. 玉林师范学院化学与材料学院;,1. 玉林师范学院化学与材料学院;,1. 玉林师范学院化学与材料学院;,1. 玉林师范学院化学与材料学院;,广西农产品加工重点实验室<培育基地>;
基金项目:广西科学研究与技术开发计划项目(桂科攻1598007-1);广西高校专利倍增计划(ZL2014091);教授科研启动基金(G20140006);全国、广西大学生创新创业训练计划项目(201410606019;201410606001)
摘    要:为进一步提高甘蔗渣的利用率,获得高取代度的羧甲基纤维素,该文采用自制搅拌磨对甘蔗渣进行机械活化预处理,以不同活化时间的甘蔗渣为原料,氯乙酸为醚化剂,氢氧化钠为催化剂制备羧甲基纤维素。以羧甲基纤维素的取代度为评价指标,分别探讨机械活化时间、固液比、氢氧化钠与氯乙酸摩尔比、反应时间、反应温度、水与底物比等因素对甘蔗渣羧甲基化反应的影响。并采用红外光谱(Fourier transform infrared spectroscopy,FTIR)、X-射线衍射(X-ray diffraction,XRD)、氢核磁共振谱(1HNMR spectroscopy,1HNMR)对甘蔗渣和羧甲基化产物表征。结果表明,机械活化对甘蔗渣羧甲基化反应具有明显的强化作用,经机械活化预处理后的甘蔗渣比原甘蔗渣更容易进行羧甲基化反应,取代度随着活化时间的延长先增大后减少。机械活化破坏了甘蔗渣中木素对纤维素的包裹作用,结晶结构受到破坏,降低纤维素的结晶度,醚化化试剂更容易渗透到甘蔗渣内部使纤维素发生羧甲基化反应,降低了对固液比、氢氧化钠/氯乙酸比、H2O/底物比、反应时间、反应温度的依赖性,提高了反应活性。在固液比为1∶18 g/mL,氢氧化钠/氯乙酸(摩尔比)为2∶1,H2O/底物比为1∶1 mL/g,75℃醚化2.0 h条件下,制得甘蔗渣羧甲基纤维素的取代度高达1.521,黏度为13 mPa·s。研究结果将为制备高取代度羧甲基纤维素提供依据和基础数据。

关 键 词:废弃物  红外光谱  扫描电镜  甘蔗渣  羧甲基纤维素  机械活化  羧甲基化
收稿时间:2015/8/13 0:00:00
修稿时间:2015/10/5 0:00:00

Preparation and characterization of carboxymethyl cellulose from mechanically activated bagasse cellulose
Chen Yuan,Wen Qingmin,Yang Jiatian,Zhu Wanren,Yu Guiying and Huang Zuqiang.Preparation and characterization of carboxymethyl cellulose from mechanically activated bagasse cellulose[J].Transactions of the Chinese Society of Agricultural Engineering,2015,31(23):300-307.
Authors:Chen Yuan  Wen Qingmin  Yang Jiatian  Zhu Wanren  Yu Guiying and Huang Zuqiang
Institution:1. College of Chemistry and Material, Yulin Normal University, Guangxi Key Laboratory of Farm Products Processing , Colleges and Universities Key Laboratory for Efficient Use of Agricultural Resources in the Southeast of Guangxi, Yulin 537000, PR China,1. College of Chemistry and Material, Yulin Normal University, Guangxi Key Laboratory of Farm Products Processing , Colleges and Universities Key Laboratory for Efficient Use of Agricultural Resources in the Southeast of Guangxi, Yulin 537000, PR China,1. College of Chemistry and Material, Yulin Normal University, Guangxi Key Laboratory of Farm Products Processing , Colleges and Universities Key Laboratory for Efficient Use of Agricultural Resources in the Southeast of Guangxi, Yulin 537000, PR China,1. College of Chemistry and Material, Yulin Normal University, Guangxi Key Laboratory of Farm Products Processing , Colleges and Universities Key Laboratory for Efficient Use of Agricultural Resources in the Southeast of Guangxi, Yulin 537000, PR China,1. College of Chemistry and Material, Yulin Normal University, Guangxi Key Laboratory of Farm Products Processing , Colleges and Universities Key Laboratory for Efficient Use of Agricultural Resources in the Southeast of Guangxi, Yulin 537000, PR China and 2. School of Chemistry and Chemical Engineering, Guangxi University, Nanning 530004, China
Abstract:
Keywords:wastes  infrared spectroscopy  scanning electron microscopy  sugarcane bagasse  carboxymethyl cellulose  mechanical activation  carboxymethylation
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