摘要
为解决纳米纤维素(CNC)用于复合材料的增强过程中易于形成自团聚现象,提高其在基质中的分散性,利用端基含有—NCO基团的脲基嘧啶酮类化合物UPy-NCO对CNC进行表面化学修饰,在CNC表面成功接枝—UPy基团。将其作为分子桥与PVA有机结合,通过多重氢键作用构筑了具有良好机械性能的超分子复合膜。对超分子复合膜的微观形貌、特征结构、热稳定性和力学性能等性质进行分析表征。测试结果表明CNC-UPy在水介质中定向排列并能均匀分散在PVA介质中,利用UPy-CNO对纳米纤维素进行修饰并未改变纳米纤维素的晶体结构,仍为纤维素Ⅰ型;力学性能测试的结果显示当CNC-UPy的含量增加到5%时,超分子复合膜的拉伸强度由34.97MPa增加到65.35MPa,增加了86.87%;热性能分析结果表明随着CNC-UPy含量的增加,超分子复合膜的初始热分解温度由231℃提高到242℃,同时最大失重速率温度由288℃提升到332℃。
In order to solve the problem of easy agglomeration of cellulose nanocrystals in composite materials and improve their dispersion in the matrix,UPy-NCO was used to chemically modify the cellulose nanocrystals,and UPy group was successfully grafted on the surface of cellulose nanocrystals.The supramolecular composite film with good mechanical properties was prepared by using CNC-UPy as a molecular bridge to combine with PVA through multiple hydrogen bonds.The micromorphology,characteristic structure,thermal stability and mechanical properties of supramolecular composite films were analyzed and characterized.CNC-UPy was oriented in aqueous medium and could be evenly dispersed in PVA matrix.Besides,the crystal structure of CNC-UPy was not destroyed,presenting typical cellulose I-type conformation.The results of mechanical property test showed that when the content of CNC upy increased to 5%,the tensile strength of supramolecular composite film increased by 86.87%The results of thermal property analysis showed that with the increase of CNC-UPy content,the initial thermal decomposition temperature of supramolecular composite membrane increased from 231℃to 242℃,and the maximum weight loss rate temperature increased from 288℃to 332℃.
作者
王汉琛
吴嘉茵
黄彪
卢麒麟
WANG Hanchen;WU Jiayin;HUANG Biao;LU Qilin(College of Material Engineering,Fujian Agriculture and Forestry University,Fuzhou 350002,China;Fujian Key Laboratory of Novel Functional Textile Fibers and Materials,Minjiang University,Fuzhou 350108,China)
出处
《纺织科技进展》
CAS
2022年第8期25-32,共8页
Progress in Textile Science & Technology
基金
福建省科技创新重点项目(高校类)(2021G02011)
福建省自然科学基金(2021J011034)
福州市科技计划项目(2021-S-089)
闽江学院引进人才项目(MJY18010)
闽江学院青年人才优培计划。
关键词
超分子复合膜
纳米纤维素
UPy
分子桥
多重氢键
supramolecular composite film
cellulose nanocrystals
UPy
molecular bridge
multiple hydrogen bonds
