丙烯酰胺改性甲壳素聚电解质的流变性质研究

Rheological Properties of Acrylamide Modified Chitin Polyelectrolyte

研究了丙烯酰胺改性甲壳素(AMC)聚电解质溶液的流变学性质.结果表明,AMC水溶液的线性粘弹流体应变范围为0~25%,溶液由粘性流体向弹性流体转变的临界质量分数为3wt%.AMC水溶液在极低质量分数时溶液呈现出牛顿流体行为,随着质量分数的增加,AMC水溶液逐渐向假塑性流体行为转变.外加盐的物质的量浓度在高剪切速率区对AMC溶液的稳态流动行为影响较小,在低速率区,物质的量浓度为0.2mol/L和0.6mol/L的NaCl会增加AMC溶液的表观粘度.频率扫描和温度扫描结果显示,随着AMC溶液质量分数的增加,储能模量(G′)、损耗模量(G″)的交点逐渐向低频区移动,3wt%、4wt%的AMC水溶液的凝胶转变温度分别为20℃和30℃.

The rheological properties of acrylamide modified chitin polyelectrolyte (AMC) solution were investigated in this papers.The results indicated that AMC aqueous solution presented a linear viscoelastic fluid in the strain range from 0 to 25%.The critical mass fraction for transition from viscous fluid to elastic fluid was determined to be 3 wt%.Steady-shear flow study showed the behavior of AMC dilute solution was a Newtonian fluid.And it would have the behavior of pseudoplastic fluid with the increase of mass fraction.The apparent viscosity of AMC solution would be increased in the appropriate concentration of salt solution at the low shear rate region.The intersections of storage modulus (G′) and loss modulus (G″) gradually moved to the low frequency region with the increase of concentration.The gel transition temperatures of 3 wt% and 4 wt% AMC aqueous solution were 20 ℃ and 30 ℃,respectively.