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Annealing-induced crystalline structure and mechanical property changes of polypropylene random copolymer

Published online by Cambridge University Press:  19 November 2013

Jing-wei Chen ,
Jian Dai ,
Jing-hui Yang ,
Ting Huang ,
Nan Zhang  and
Yong Wang
Jing-wei Chen
Affiliation:
Key Laboratory of Advanced Technologies of Materials (Ministry of Education), School of Materials Science and Engineering, Southwest Jiaotong University, Chengdu 610031, China
Jian Dai
Affiliation:
Key Laboratory of Advanced Technologies of Materials (Ministry of Education), School of Materials Science and Engineering, Southwest Jiaotong University, Chengdu 610031, China
Jing-hui Yang
Affiliation:
Key Laboratory of Advanced Technologies of Materials (Ministry of Education), School of Materials Science and Engineering, Southwest Jiaotong University, Chengdu 610031, China
Ting Huang
Affiliation:
Key Laboratory of Advanced Technologies of Materials (Ministry of Education), School of Materials Science and Engineering, Southwest Jiaotong University, Chengdu 610031, China
Nan Zhang
Affiliation:
Key Laboratory of Advanced Technologies of Materials (Ministry of Education), School of Materials Science and Engineering, Southwest Jiaotong University, Chengdu 610031, China
Yong Wang*
Affiliation:
Key Laboratory of Advanced Technologies of Materials (Ministry of Education), School of Materials Science and Engineering, Southwest Jiaotong University, Chengdu 610031, China
*
a)Address all correspondence to this author. e-mail: yongwang1976@163.com
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Abstract

In this work, the effects of annealing treatment on the crystalline structure and mechanical property changes of polypropylene random copolymer (PPR) were comparatively investigated. Wide angle x-ray diffraction and differential scanning calorimetry were used to study the crystalline structure evolution of the annealed PPR sample. The relaxation behavior of the annealed PPR sample was analyzed using dynamic mechanical analysis. The mechanical properties and the toughening mechanism were also investigated. The results showed that the crystalline structure evolution of the annealed PPR sample depended on the annealing temperature. Due to the largely increased molecular chain mobility in the amorphous region, which promoted the plastic deformation of the annealed PPR sample under the impact condition, largely enhanced impact strength was achieved at a moderate annealing temperature. Further results showed that relatively shorter annealing duration could induce the apparent changes of crystalline structure and mechanical properties of the PPR sample.

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Articles
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Journal of Materials Research , Volume 28 , Issue 22 , 28 November 2013 , pp. 3100 - 3108
Copyright
Copyright © Materials Research Society 2013 

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References

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