应用动态流变实验测定了温敏共聚物的流体特性,分析其在溶胶-凝胶转变过程共聚物溶液随温度变化形成凝胶机理。以室内合成的四元共聚物溶液为基础,采用动态流变实验测定了该共聚物溶液在不同温度、浓度下的剪切模量和损耗模量的变化,确定了凝胶特性,并与试管倒置法比较了凝胶温度。实验结果表明,临界温度为143℃,在一定浓度下（高于接触浓度C＊）,低于此温度共聚物溶液具有一般粘性流体特性;高于此温度可形成凝胶网络结构;溶液在测试温度（65～240℃）内,其损耗角从56.27°逐渐变为31.04°,溶液体系从粘性流体逐渐到粘弹性流体过渡;说明该溶液在一定浓度下具有温敏特性。
Dynamic rheological experiment was done to characterize the rheological property of thermal thickening copolymers in situ gel and to analyze its solution to gel for explaining the mechanism.Based on the tetra-polymer solution,the shear modulus and loss modulus of thermal thickening copolymers under different temperatures,concentrations were characterized,the gel properties,and compare the gel temperature with tube inversion were determined.The results show that the critical temperature is 143℃,under a certain concentration（higher than contact concentration C＊）,lower this temperature copolymer has the general characteristics of viscous fluid;higher this temperature can form the gel network structure;under 65 to 240℃ loss angle of solution is changed from 56.27 to 31.04 ° and properties of solution is also changed viscous to viscoelastic fluid;this shows that the solution has thermal thickening properties under a certain concentration.
参考文献
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