流场下不相容聚合物共混物分散相形态的研究进展

Research Progress in Morphology of Dispersed Phases in Immiscible Polymer Blends under Flow Field

介绍了流场下不相容聚合物共混物分散相形态及演变研究进展,并指出这是获得性能优异共混材料的关键。在流场下,不相容共混物分散相尺寸由破碎和凝聚等动力学过程决定。鉴于模型的理想化,早期研究主要针对牛顿流体,且分散相的变形、破碎和凝聚等理论均发源于此。对于聚合物共混物,其在本质上与牛顿流体有很多相似之处,然而,独特黏弹性质却是影响其相形态的重要因素。最后,对一些预测分散相尺寸的理论模型进行了总结,并重点讨论了分散相浓度、聚合物弹性、增容和填料等因素对流场下分散相形态的影响。

The morphology evolution during melt blending plays an important role in the final microstructure and performance of multiphase polymeric materials. The dispersed phase size of immiscible polymer blends under flow field is determined by the breakup and coalescence processes of droplets. The earlier studies are mainly limited to Newtonian systems. Much of the deformation, breakup and coalescence theories of droplets have originated from the Newtonian systems. In essence, polymer blends have many similarities with the Newtonian fluid. However, their unique viscoelastic properties play an important role that can not be neglectable during the morphological evolution. Recent experimental and theoretical progresses in the morphology of immiscible polymer blends with droplet structure under flow field were summarized. Several theoretical models in predicting the dispersed phase size were compared. The influences of various factors such as shear rate, composition, elasticity, compatibilizers and fillers on the morphology of dispersed .