EFFECT OF RUBBER ADDITION ON STRUCTURE AND PROPERTY DISTRIBUTION OF THIN-WALL INJECTION MOLDED POLYPROPYLENE

摘要

In this research, rubber with two different molecular weights was added to thin-wall injection molded polypropylene (PP). The effect of rubber addition on structure and property distribution of these thin-wall injection molded polypropylene (PP) samples was investigated using Polarized Optical Microscopy (POM), Differential Scanning Calorimetry (DSC), Wide Angle X- ray Diffraction (WAXD), a high speed tensile test, and a micro-cutting method. The thin-wall injection molded PP with high molecular weight with rubber exhibited the higher crystalline orientation and β-crystalline fraction as compared to other samples. Micro cutting method results revealed that the addition of rubber to PP samples led to lower shear strength. The relationship between structure and property distribution of thin-wall injection molded PP is discussed on the basis of these results.