壳聚糖/聚乙烯醇的流变行为及其可纺性研究  

Rheological Behavior of Chitosan/Polyvinyl Alcohol and Its Spinnability

作　　者：曾文超 孙浩东 张宗威 李建国 陈礼辉[1,2] ZENG Wenchao;SUN Haodong;ZHANG Zongwei;LI Jianguo;CHEN Lihui(College of Materials Engineering,Fujian Agriculture and Forestry University,Fuzhou 350108,China;National Forestry&Grassland Administration Key Laboratory for Plant Fiber Functional Materials,Fuzhou 350108,China)

机构地区：[1]福建农林大学材料工程学院,福建福州350108 [2]植物纤维功能材料国家林业和草原局重点实验室,福建福州350108

出　　处：《林产化学与工业》2023年第5期25-31,共7页Chemistry and Industry of Forest Products

基　　金：国家自然科学基金资助项目(31971612)。

摘　　要：采用乙酸(HAc)作为溶剂,配制壳聚糖(CS)/聚乙烯醇(PVA)纺丝液,探究纺丝液稳态流变和动态流变性能并考察其静电纺丝的可行性。研究结果表明:随着CS质量分数的增加,纺丝液的稠度系数、结构黏度指数、表观黏度、储能模量(G′)、损耗模量(G″)和复合黏度(η*)均相应增加,非牛顿指数相应减小,不利于CS/PVA纺丝液静电纺丝。随着测试温度的增加,纺丝液的稠度系数、结构黏度指数、表观黏度、G′、G″和η*均相应减小,非牛顿指数相应增加,纺丝液流动性能加强,可纺性提升。当CS质量分数为3.0%时,纺丝液在测试温度30℃下的稠度系数和结构黏度指数均较小,分别为7.9781和2.16,且非牛顿指数为0.8877接近于1,表明该纺丝液具有良好的流动性和加工性。结合SEM和流变行为分析,在室温条件下CS质量分数为3.0%的CS/PVA纺丝液呈现优异的可纺性,可以构建连续、均匀且不带珠状连结的纳米纤维。The chitosan(CS)/polyvinyl alcohol(PVA)spinning solution was prepared using acetic acid(HAc)as solvent.The steady-state rheological and dynamic rheological properties were investigated,and the feasibility of electrospinning was examined.The results showed that with the increase of CS mass fraction,the consistency coefficient,structural viscosity index,apparent viscosity,storage modulus(G′),loss modulus(G″)and composite viscosity(η*)of the spinning solution increased accordingly,while the non-Newtonian index decreased accordingly,which was not conducive to the electrospinning of CS/PVA spinning solution.With the increase of the test temperature,the consistency coefficient,structural viscosity index,apparent viscosity,G′,G″ndη*of the spinning solution decreased correspondingly,whereas the non-Newtonian index increased,the flow performance of the spinning liquid was strengthened and the spinnability was improved.When the mass fraction of CS was 3.0%,the apparent viscosity,consistency coefficient and structural viscosity index of the spinning solution at the test temperature of 30℃were small,which were 1.650 Pa·s,7.9781 and 2.16,respectively,and the non-Newtonian index was 0.8877 close to 1,indicating that the spinning solution had good fluidity and processability.Combined with SEM and rheological behavior analysis,under room temperature the CS/PVA spinning solution with a CS mass fraction of 3.0%exhibited excellent spinnability and could construct continuous,uniform nanofibers without beaded connections.

关 键 词：壳聚糖 稳态流变性能 动态流变性能 静电纺丝 纳米纤维 

分 类 号：TQ35[化学工程]