植物纤维的阳离子化改性及其对纤维结构的影响  

Cationic Modification of Plant Fibers and its Effect on Fiber Structure

作　　者：张世超 刘佳璇 李群[1] ZHANG Shichao;LIU Jiaxuan;LI Qun(Tianjin Key Laboratory of Pulp and Paper,College of Light Industry Science and Engineering,Tianjin University of Science&Technology,Tianjin 300457,China)

机构地区：[1]天津市制浆造纸重点实验室,天津科技大学轻工科学与工程学院,天津300457

出　　处：《天津科技大学学报》2020年第5期15-19,共5页Journal of Tianjin University of Science & Technology

基　　金：国家重点研发计划项目资助(2017YFB0307900)。

摘　　要：通过对纤维阳离子化预处理过程进行优化,制备表面带有正电荷的阳离子纳纤化纤维素(CNFC).采用红外光谱(FTIR)、X射线衍射光谱(XRD)和热重分析(TG)对阳离子化前后纤维的结构和热稳定性变化进行分析.利用扫描电镜(SEM)对CNFC的表面形貌进行观察.结果表明最佳醚化条件为:醚化温度50℃、醚化时间2.5 h、NaOH与醚化剂EPTMAC的物质的量比为2.0,醚化剂EPTMAC与纤维素葡萄糖单元的物质的量比为1.5.经过阳离子化处理,纤维素的结晶度和热稳定性降低.Cationic nanofibril cellulose(CNFC)with positive charge on the surface was prepared through optimizing the pretreatment process of fiber cationization.Fourier transform infrared spectroscopy(FTIR),X ray diffraction spectroscopy(XRD),and thermogravimetric(TG)were used to analyze the changes of fiber structure and thermal stability before and after cationization.The surface morphology of CNFC was observed with scanning electron microscopy(SEM).The results showed that the optimum etherification conditions were as follows:the etherification temperature was 50℃,etherification time 2.5 h,the molar ratio of NaOH to etherification agent EPTMAC 2.0,and the molar ratio of EPTMAC to cellulose glucose unit was 1.5.After the cationic treatment,the crystallinity and thermal stability of the cellulose decreased.

关 键 词：阳离子化 纳纤化纤维素 阳电荷密度 结晶结构 热稳定性 

分 类 号：TS721.1[轻工技术与工程—制浆造纸工程]