文献类型：期刊文献

英文题名：Morphology, Nonisothermal Crystallization Behavior and Mechanical Properties of Polypropylene Modified by Ionomers

作者：Ma, Yulu[1];Yang, Gaopin[1];Xie, Linsheng[1]

机构：[1]E China Univ Sci & Technol, Sch Mech & Power Engn, Shanghai 200237, Peoples R China

年份：2014

卷号：53

期号：12

起止页码：1829

外文期刊名：JOURNAL OF MACROMOLECULAR SCIENCE PART B-PHYSICS

收录：;EI(收录号：20144700234832);WOS:【SCI-EXPANDED(收录号:WOS:000345007700005)】；

基金：The authors are grateful for the financial support from National Natural Science Foundation of China (51273065).

语种：英文

外文关键词：ionomers; nonisothermal crystallization; polypropylene

摘要：The morphology and nonisothermal crystallization behavior of polypropylene modified by ionomers based on ethylene copolymers (Surlyn 8920 and 9320) were investigated by using scanning electron microscopy (SEM) and differential scanning calorimetry (DSC). The crystallization rate of polypropylene was accelerated by the ionomers which initiated heterogeneous nucleation of the polypropylene. At low ionomers content (0.25 wt%), Surlyn 8920, neutralized by sodium, was more efficient to enhance the crystallization rate of polypropylene than Surlyn 9320 (neutralized by zinc). The crystallization process of polypropylene modified by the ionomers was analyzed by different kinetics models. The study showed that the Mo approach was applicable for this system, whereas the Avrami, Jeziorny, and Ozawa methods were not. Furthermore, the notched impact strength of polypropylene modified by the ionomers was increased without any reduction of tensile strength and flexural modulus.