Origin of High Elastic Recovery of Hard-elastic Polypropylene Film at Room Temperature: the Mixed Contribution of Energy Elasticity and Entropy Elasticity

Jia-Yi Xie; Rui-Jie Xu; Cai-Hong Lei

doi:10.1007/s10118-020-2432-8

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Origin of High Elastic Recovery of Hard-elastic Polypropylene Film at Room Temperature: the Mixed Contribution of Energy Elasticity and Entropy Elasticity

ARTICLE | Updated：2020-06-19

- Origin of High Elastic Recovery of Hard-elastic Polypropylene Film at Room Temperature: the Mixed Contribution of Energy Elasticity and Entropy Elasticity
- Origin of High Elastic Recovery of Hard-elastic Polypropylene Film at Room Temperature: the Mixed Contribution of Energy Elasticity and Entropy Elasticity
- Chinese Journal of Polymer Science 2020年38卷第12期页码：1325-1334
- Affiliations：
  
  Guangdong Provincial Key Laboratory of Functional Soft Condensed Matter, Guangdong Provincial Engineering Laboratory of Energy Storage Materials and Devices, School of Materials and Energy, Guangdong University of Technology, Guangzhou 510006, China
- Author bio：
  
  xu565786@163.com (R.J.X.)
  lch528@gdut.edu.cn (C.H.L.)
- Funds：
  
  The work was financially supported by the National Natural Science Foundation of China (Nos. 51773044 and 51603047), Research and Development Plan for Key Areas in Guangdong Province (No. 2019B090914002), Guangdong Province Science and Technology Plan Project (No. 2016A010103030), the PhD Start-up Fund of Natural Science Foundation of Guangdong Province, China (No. 2016A030310344).
- DOI：10.1007/s10118-020-2432-8
  中图分类号：
- 收稿：2020-01-28，
  
  修回：2020-3-4，
  
  录用：2020-3-24，
  
  网络首发：2020-06-19，
  
  纸质出版：2020-09-10
- Accepted：
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Xie, J. Y.; Xu, R. J.; Lei, C. H. Origin of high elastic recovery of hard-elastic polypropylene film at room temperature: the mixed contribution of energy elasticity and entropy elasticity. Chinese J. Polym. Sci. 2020, 38, 1325–1334

Jia-Yi Xie, Rui-Jie Xu, Cai-Hong Lei. Origin of High Elastic Recovery of Hard-elastic Polypropylene Film at Room Temperature: the Mixed Contribution of Energy Elasticity and Entropy Elasticity[J]. Chinese Journal of Polymer Science, 2020, 38(12): 1325-1334.
Xie, J. Y.; Xu, R. J.; Lei, C. H. Origin of high elastic recovery of hard-elastic polypropylene film at room temperature: the mixed contribution of energy elasticity and entropy elasticity. Chinese J. Polym. Sci. 2020, 38, 1325–1334 DOI： 10.1007/s10118-020-2432-8.

Jia-Yi Xie, Rui-Jie Xu, Cai-Hong Lei. Origin of High Elastic Recovery of Hard-elastic Polypropylene Film at Room Temperature: the Mixed Contribution of Energy Elasticity and Entropy Elasticity[J]. Chinese Journal of Polymer Science, 2020, 38(12): 1325-1334. DOI： 10.1007/s10118-020-2432-8.

摘要

Abstract

The crystalline and amorphous regions were alternately arranged in the hard elastic polypropylene (PP) films with row-nucleated lamellae. In this work

their structure evolution during stretching and recovery at room temperature was followed and the elastic recovery mechanism was discussed by twice cyclic tensile experiment. During the first stretching to 100%

the lamellae crystals are parallel separated and the intercrystallite crazing is formed at the first yield point. Many nano-cavities within the intercrystallite crazing appear when the strain reaches 20%. The strain-hardening process accompanies with the lamellae long period increasing and the intercrystallite crazing enlargement. After the secondary yield point

the lamellae cluster is further separated and more nano-cavities appear. The first and second recovery processes are complete overlap. During recovery

firstly

the energy elasticity provided by nano-cavities surface tension drives the shrinkage of material

and then the entropy elasticity related to amorphous chain relaxation plays a leading role when the strain is smaller than the secondary yield point. The elastic recovery process of hard elastic material is the co-contribution of energy elasticity and entropy elasticity. This work gives a clearer recognition about the source of hard elastic property and the role of amorphous region in material’s deformation.

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references

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