Rheology and Processability of Engineering Plastic Polymer Blends

在大的阶跃剪切应变作用下，从两个方向直接观察到嵌在聚二甲基硅氧烷基体中的聚异丁烯液滴的变形和回复。液滴的形状和恢复时间强烈依赖于所施加的应变的大小。在施加大的应变后，液滴几乎变形成扁平的椭球体。然后，它变成杆状，哑铃形，旋转椭球形，最后变成球形。模型计算表明，界面能是形状恢复的主要驱动力，其作用是减小变形液滴的表面积。研究了工程塑料聚碳酸酯/聚苯乙烯共混物熔体的动态粘弹性。从共混物的透射电子显微照片估计分散相的液滴的平均半径。用动力学数据和Plierne理论计算了两种聚合物的界面张力，结果表明界面张力与其它方法所得结果吻合较好。结果发现，共混物的摩擦学性能的强烈影响的相形态，结晶结构，以及母体聚合物之间的界面粘合力，以及组分的组成。

The deformation and recovery of a poly (isobutylene) droplet embedded in a poly (dimethylsiloxane) matrix are directly observed from two directions after application of a large step shear strain. The droplet shape and recovery time strongly depended on the magnitude of the applied strain. Just after application of a large strain, a droplet deforms almost affinely to a flat ellipsoid. It then changes into a rod-like shape, a dumbbell and to an ellipsoid of revolution, and finally to a sphere. Model calculations show that the primary driving force for the shape recovery is the interfacial energy in order to reduce the surface area of the deformed droplet.Dynamic viscoelatic properties of polycarbonate as a engineering plastic/polystirene blend melts were investigated. The average radius of droplets of dispersed phase was estimated from transmission electron micrographs of the blend. Further the interfacial tension between these two polymers were determined by comparison of the dynamic data with thge Plierne theory, and found to agree fairly well with the values obtained by other methods.Tribological properties of polyamide 6/polyolefin blends were investigated. It was found that the tribological properties of the blends are strongly affected by the phase morphology, crystalline structure, and interfacial adhesion between parent polymers as well as the composition of the components.