STUDIES ON THE CRYSTAL STRUCTURE OF POLYPROPYLENE OBTAINED BY COOLING MELT NEAR MELTING POINT UNDER SHEAR FLOW
剪切应力场中聚丙烯熔体在近熔点处冷却结晶的晶体结构研究

In order to study the crystal structure of polypropylene obtained by cooling melt near melting point under shear flow,samples were prepared by using a dynamic packing injection molding (DPIM) device which was designed by ourselves. With the aid of scanning electron microscopy ( SEM ),differential scanning calorimetry (DSC) and wide-angle x-ray diffraction (WAXD),crystal stuctures and morphologies were studied from skin to shear regions in these samples obtained by cooling melt near melting point under shear...