聚合物共混体系相行为的动态流变学研究进展

对具有临界相行为(LCST、UCST)的聚合物共混体系，小应变状态下的动态流变行为对体系在相分离过程中形态结构的形成与演化极其敏感，非均相结构的产生使体系在长时松弛区域表现出与均相聚合物体系不同的粘弹松弛行为．即弹性显著增加、松弛时间明显增长以及时-温叠加原理失效，偏离经典的线性粘弹理论模型。这为用动态流变学方法研究聚合物共混体系的相行为提供了理论依据。文中综述了该领域的研究进展。

DYNAMIC RHEOLOGY STUDIES ON THE PHASE BEHAVIOR OF POLYMER BLENDS

Using the dynamic rheology to explore the phase behavior of polymer blends exhibiting critical phase behavior (LCST, UCST) is theoretically based on the fact that their dynamic rheological response under the small strain condition is very sensitive to the formation and evolution of the morphology and structure during the phase separation process, and the presence of the heterogeneous structure leads to the different viscoelastic relaxation behavior from the corresponding homogeneous counterparts in the long time relaxation region. That is, it deviates from the classical linear viscoelastic theoretical models by the enhanced elasticity, much longer relaxation time and breakdown of time-temperature superposition principle. The advances in this field were reviewed in this paper.