Molecular Mobility in the Amorphous Phase Determines the Critical Strain of Fibrillation in the Tensile Stretching of Polyethylene

Rui Li; Guo-Xing Yang; Ya-Nan Qin; Li Liu; Zhi-Yong Jiang

doi:10.1007/s10118-020-2362-5

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Molecular Mobility in the Amorphous Phase Determines the Critical Strain of Fibrillation in the Tensile Stretching of Polyethylene

ARTICLE | Updated：2019-11-27

- Molecular Mobility in the Amorphous Phase Determines the Critical Strain of Fibrillation in the Tensile Stretching of Polyethylene
- Chinese Journal of Polymer Science Vol. 38, Issue 7, Pages: 740-747(2020)
- Affiliations：
  
  a.School of Chemistry and Chemical Engineering, State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology, Harbin 150001, China
  b.Daqing Petrochemical Research Center, Petrochemical Research Institute, China National Petroleum Corporation, Daqing 163714, China
  c.State Key Laboratory of Polymer Physics and Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, China
- Author bio：
  
  jiangzhy@ciac.ac.cn
- Funds：
- DOI：10.1007/s10118-020-2362-5
  CLC：
- Received：11 September 2019，
  
  Revised：2019-10-5，
  
  Accepted：08 October 2019，
  
  Online First：27 November 2019，
  
  Published：2020-07
- Accepted：
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Li, R.; Yang, G. X.; Qin, Y. N.; Liu, L.; Jiang, Z. Y. Molecular mobility in the amorphous phase determines the critical strain of fibrillation in the tensile stretching of polyethylene. Chinese J. Polym. Sci. 2020, 38, 740–747

Rui Li, Guo-Xing Yang, Ya-Nan Qin, et al. Molecular Mobility in the Amorphous Phase Determines the Critical Strain of Fibrillation in the Tensile Stretching of Polyethylene[J]. Chinese Journal of Polymer Science, 2020, 38(7): 740-747.
Li, R.; Yang, G. X.; Qin, Y. N.; Liu, L.; Jiang, Z. Y. Molecular mobility in the amorphous phase determines the critical strain of fibrillation in the tensile stretching of polyethylene. Chinese J. Polym. Sci. 2020, 38, 740–747 DOI： 10.1007/s10118-020-2362-5.

Rui Li, Guo-Xing Yang, Ya-Nan Qin, et al. Molecular Mobility in the Amorphous Phase Determines the Critical Strain of Fibrillation in the Tensile Stretching of Polyethylene[J]. Chinese Journal of Polymer Science, 2020, 38(7): 740-747. DOI： 10.1007/s10118-020-2362-5.

摘要

Abstract

The microstructural development of bimodal high density polyethylene subjected to tensile deformation was investigated as a function of strain after annealing at different temperatures by means of a scanning synchrotron small angle X-ray scattering (SAXS) technique. Two different deformation mechanisms were activated in sequence upon tensile deformation: intralamellar slipping of crystalline blocks dominates the deformation behavior at small deformations whereas a stress-induced crystalline block fragmentation and recrystallization process occurs at a critical strain yielding new crystallites with the molecular chains preferentially oriented along the drawing direction. The critical strain associated with the lamellar-to-fibrillar transition was found to be

. 0.9 in bimodal sample

which is significantly larger than that observed for unimodal high-density polyethylene (0.4). This observation is primarily due to the fact that the bimodal sample possesses a greater mobility of the amorphous phase and thereby a reduced modulus of the entangled amorphous network. The conclusion of the mobility of the amorphous phase as a determining factor for the critical strain was further proven by the

H-NMR

relaxation time. All these findings contribute to our understanding of the excellent slow crack growth resistance of bimodal polyethylene for pipe application.

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references

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