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Annealing induced microstructure and mechanical property changes of impact resistant polypropylene copolymer

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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 °C to 160 °C 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 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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Authors and Affiliations

  1. Key Laboratory of Advanced Technologies of Materials (Ministry of Education), School of Materials Science & Engineering, Southwest Jiaotong University, Chengdu, 610031, China

    Jing-wei Chen, Jian Dai, Jing-hui Yang, Nan Zhang, Ting Huang & Yong Wang  (王勇)

  2. State Key Laboratory of Oral Diseases, Sichuan University, Chengdu, 610041, China

    Chao-liang Zhang

Authors
  1. Jing-wei Chen
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  2. Jian Dai
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  3. Jing-hui Yang
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  4. Nan Zhang
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  5. Ting Huang
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  6. Yong Wang  (王勇)
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  7. Chao-liang Zhang
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Corresponding author

Correspondence to Yong Wang  (王勇).

Additional information

This work was financially supported by the National Natural Science Foundation of China (No. 51173151) and the Distinguished Young Scholars Foundation of Sichuan (No. 2012JQ0057).

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Chen, Jw., Dai, J., Yang, Jh. et al. Annealing induced microstructure and mechanical property changes of impact resistant polypropylene copolymer. Chin J Polym Sci 33, 1211–1224 (2015). https://doi.org/10.1007/s10118-015-1668-1

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  • DOI: https://doi.org/10.1007/s10118-015-1668-1

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