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

Jing-wei Chen; Jian Dai; Jing-hui Yang; Nan Zhang; Ting Huang; Yong Wang; Chao-liang Zhang

doi:10.1007/s10118-015-1668-1

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

PAPER | Updated：2021-06-21

- Annealing Induced Microstructure and Mechanical Property Changes of Impact Resistant Polypropylene Copolymer
- Chinese Journal of Polymer Science Vol. 33, Issue 9, Pages: 1211-1224(2015)
- Affiliations：
  
  a.Key Laboratory of Advanced Technologies of Materials (Ministry of Education), School of Materials Science & Engineering, Southwest Jiaotong University, Chengdu 610031, China
  b.State Key Laboratory of Oral Diseases, Sichuan University, Chengdu 610041, China
- Author bio：
  
  **Yong Wang (王勇), E-mail: yongwang1976@163.com
- Funds：
- DOI：10.1007/s10118-015-1668-1
  CLC：
- Received：02 January 2015，
  
  Revised：2015-01-12，
  
  Accepted：15 January 2015，
  
  Published：2015-09
- Accepted：
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Jing-wei Chen, Jian Dai, Jing-hui Yang, et al. Annealing Induced Microstructure and Mechanical Property Changes of Impact Resistant Polypropylene Copolymer[J]. Chinese Journal of Polymer Science, 2015, 33(9): 1211-1224.
DOI：

Jing-wei Chen, Jian Dai, Jing-hui Yang, et al. Annealing Induced Microstructure and Mechanical Property Changes of Impact Resistant Polypropylene Copolymer[J]. Chinese Journal of Polymer Science, 2015, 33(9): 1211-1224. DOI： 10.1007/s10118-015-1668-1.

摘要

Abstract

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

PP 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 IPC 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 temperature (140 °C)

largely enhanced impact strength was achieved for the annealed IPC sample. The toughening mechanisms were analyzed based on the phase reorganization and relaxation behavior.

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