摘要
采用ZnCl2·4H2O溶液作为纤维素和壳聚糖的共同溶剂,制备纤维素/壳聚糖/ZnCl2·4H2O溶液,研究温度、原料组分和剪切频率等对纤维素/壳聚糖/ZnCl2·4H2O溶液流变性能的影响.研究结果表明:溶液中大分子链间缠结点在高温下更易打开,流动阻力下降;CS/BC分数增加时缠结作用强,流动阻力升高.故溶液的表观黏度、结构黏度指数、零切黏度、储能模量和损耗模量随着温度的升高而减小,随着壳聚糖/纤维素(CS/BC)分数的增加而增大;剪切频率增加,溶液的表观黏度减小,储能模量和损耗模量增大.
ZnCl2·4H2O solution was used as a common solvent of cellulose and chitosan and cellulose/chitosan/ZnCl2·4H2O solution was prepared.The effects of temperature,mass fraction of raw materials and shearing frequency on the rheological properties of cellulose/chitosan/ZnCl2·4H2O solution were investigated.The results show that the entanglement points between the macromol ecular chains in solution at high temperatures are easier to untwist thus the flow resistance decreased and the entanglement increase with the increase of mass fraction of chitosan/cellulose.As a result the apparent viscosity,structural viscosity index,zero shear viscosity,storage modulus and loss modulus decrease with the increase of temperature and increase with the increase of mass fraction of chitosan/cellulose.The apparent viscosity of cellulose/chitosan/ZnCl2·4H2O solution decreases,while the storage modulus and loss modulus increase with the increase of shearing frequency.
出处
《华中师范大学学报（自然科学版）》
CAS
CSCD
北大核心
2012年第6期700-704,共5页
Journal of Central China Normal University：Natural Sciences
基金
国家自然科学基金项目(30671637)
福建省科技重大专项(2008HZ0001-1)
