Annealing Induced Microstructure and Mechanical Property Changes of Impact Resistant Polypropylene Copolymer

作     者：Jing-wei Chen Jian Dai Jing-hui Yang Nan Zhang Ting Huang 王勇 Chao-liang Zhang 

作者机构：Key Laboratory of Advanced Technologies of Materials (Ministry of Education) School of Materials Science & Engineering Southwest Jiaotong University State Key Laboratory of Oral Diseases Sichuan University 

出 版 物：《Chinese Journal of Polymer Science》 (高分子科学（英文版）)

年 卷 期：2015年第33卷第9期

页      面：1211-1211,1212-1224页

核心收录：

学科分类：0817[工学-化学工程与技术] 08[工学] 081401[工学-岩土工程] 0805[工学-材料科学与工程（可授工学、理学学位）] 080502[工学-材料学] 0703[理学-化学] 0814[工学-土木工程] 

基　　金：financially supported by the National Natural Science Foundation of China(No.51173151) the Distinguished Young Scholars Foundation of Sichuan(No.2012JQ0057) 

主　　题：Impact resistant polypropylene copolymer Annealing Microstructure Mechanical properties. 

摘      要：The effects of annealing on microstructure and mechanical properties of an impact resistant polypropylene copolymer （IPC） were investigated. Different annealing temperatures ranging from 80 ℃ to 160 ℃ were selected. The phase reorganization of IPC during annealing process was studied through morphological characterization technologies, including scanning electron microscopy （SEM） and transmission electron microscopy （TEM）. The crystalline structure changes in the IPC sample, including the iPP matrix and PE component, were investigated using wide angle X-ray diffraction （WAXD） and differential scanning calorimetry （DSC）. Dynamic mechanical analysis （DMA） was used to analyze the relaxation extent of 1PC before and after annealing. The results showed that annealing induced phase reorganization in IPC and the degree of phase reorganization depended on annealing temperature. The annealed IPC samples exhibited largely increased crystallinity compared with the unannealed one. Intensified damping peak with increased molecular chain mobility was achieved for the annealed IPC samples. At an appropriate annealing tem. perature （140 ℃）, largely enhanced impact strength was achieved for the annealed IPC sample. The toughening mechanisms were analyzed based on the phase reorganization and relaxation behavior.