In this study, the crystallization behavior of oriented isotactic polypropylene during solid-state stretching was investigated by in-situ wide-angle X-ray scattering. Results showed that a new arc appeared on (040) reflection with previous arcs remained when direction inclined to initial orientation direction, as result induced crystallization. The process occurred later than yielding but earli...

High-impact polypropylenes (HIPPs) are complex blends, featuring a crystalline isotactic polypropylene matrix and dispersed phase consisting of an amorphous ethylene/propylene copolymer (EPR). The relative amount EPR its composition heavily affect the application properties material need to be accurately controlled. Standard analytical methods time- labor-intensive require considerable amounts ...

In sharp contrast with their amorphous counterparts, crystalline polymers provide a wealth of information on chain conformation, the packing chains in unit-cells, existence or not mirror symmetric conformations, lamellae, folds linking stems, and so forth. Three illustrations these insights are presented here: (a) orientation polymer (b) complete structural analysis alpha phase isotactic polypr...

This study was conducted in the Khartoum refinery Algylee to properties of polypropylene (grade 113 &114) which are produced by addition technique; they used refined propylene from Liquefied Petroleum Gas and Ziegler-Natta catalyst. The samples were taken (1-15)/08/2010 three features (powder, granulates, specimens). Both grades homopolymer isotactic polypropylene. They checked component li...