Rheology and Processability of Engineering Plastic Polymer Blends

在大阶跃剪切应变作用下，从两个方向直接观察了聚二甲基硅氧烷基质中聚异丁烯液滴的变形和回复过程。液滴的形状和恢复时间强烈依赖于所施加的应变的大小。就在施加大应变后，液滴几乎与扁平椭球体相近地变形。然后它变成杆状、哑铃和旋转的椭球体，最后变成球体。模型计算表明，形状回复的主要驱动力是界面能，以减小变形液滴的表面积。研究了聚碳酸酯作为工程塑料/聚苯乙烯共混熔体的动态粘弹性能。根据共混物的透射电子显微镜，估算了分散相液滴的平均半径。此外，通过与Plierne理论的动态数据比较，测定了两种聚合物之间的界面张力，结果与用其他方法得到的值符合得很好。研究了聚酰胺6/聚烯烃共混物的摩擦学性能。结果表明，共混物的摩擦学性能受共混物的相形态、结晶结构、母体间的界面粘附性以及组分组成的影响较大。

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.