Comparative Investigation on Step-cycle Tensile Behaviors of Two Bimodal Pipe-grade Polyethylene with Different Slow Crack Growth Resistance

Yan-Qin Huang; Qing-Long Zhang; Xiao-Ying Lu; Yi-Bin Gong; Hao Zhou; Jia-Chun Feng

doi:10.1007/s10118-020-2364-3

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Comparative Investigation on Step-cycle Tensile Behaviors of Two Bimodal Pipe-grade Polyethylene with Different Slow Crack Growth Resistance

ARTICLE | Updated：2019-12-05

- Comparative Investigation on Step-cycle Tensile Behaviors of Two Bimodal Pipe-grade Polyethylene with Different Slow Crack Growth Resistance
- Chinese Journal of Polymer Science Vol. 38, Issue 6, Pages: 611-619(2020)
- Affiliations：
  
  a.State Key Laboratory of Molecular Engineering of Polymers, Department of Macromolecular Science, Fudan University, Shanghai 200433, China
  b.Laboratory for Synthetic Resin Research, PetroChina Petrochemical Research Institute, Beijing 100083, China
  c.Institute of Dushanzi Petrochemical Corporation, PetroChina Company Limited, Dushanzi 833699, China
- Author bio：
  
  jcfeng@fudan.edu.cn
- Funds：
- DOI：10.1007/s10118-020-2364-3
  CLC： M
- Received：14 August 2019，
  
  Revised：2019-9-17，
  
  Accepted：17 October 2019，
  
  Online First：05 December 2019，
  
  Published：2020-06
- Accepted：
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Huang, Y. Q.; Zhang, Q. L.; Lu, X. Y.; Gong, Y. B.; Zhou, H.; Feng, J. C. Comparative investigation on step-cycle tensile behaviors of two bimodal pipe-grade polyethylene with different slow crack growth resistance. Chinese J. Polym. Sci. 2020, 38, 611–619

Yan-Qin Huang, Qing-Long Zhang, Xiao-Ying Lu, et al. Comparative Investigation on Step-cycle Tensile Behaviors of Two Bimodal Pipe-grade Polyethylene with Different Slow Crack Growth Resistance[J]. Chinese Journal of Polymer Science, 2020, 38(6): 611-619.
Huang, Y. Q.; Zhang, Q. L.; Lu, X. Y.; Gong, Y. B.; Zhou, H.; Feng, J. C. Comparative investigation on step-cycle tensile behaviors of two bimodal pipe-grade polyethylene with different slow crack growth resistance. Chinese J. Polym. Sci. 2020, 38, 611–619 DOI： 10.1007/s10118-020-2364-3.

Yan-Qin Huang, Qing-Long Zhang, Xiao-Ying Lu, et al. Comparative Investigation on Step-cycle Tensile Behaviors of Two Bimodal Pipe-grade Polyethylene with Different Slow Crack Growth Resistance[J]. Chinese Journal of Polymer Science, 2020, 38(6): 611-619. DOI： 10.1007/s10118-020-2364-3.

摘要

Abstract

In this work

step-cycle tensile behavior of two bimodal polyethylene (PE) materials

a PE100 grade pipe material

XS10

and a PE100-RC (Resistant Crack) grade pipe material

XSC50

was comparatively investigated. By decomposing the strain into a recoverable part and an unrecoverable part

it was found that the deformation recovery capability of XSC50 during stretching was larger than that of XS10. Structural evolution characterized by

in situ

synchrotron small angle X-ray scattering indicated that the fragmentation of initial crystals in XSC50 occurred at lower strain than in XS10. Considering that XSC50 had relatively small lamellar thickness and similar crystallinity to XS10

we speculated that the larger deformation recovery capability of XSC50 during stretching probably derived from stronger entangled amorphous region caused by larger density of tie molecules and entanglements

which were usually regarded to have a significant influence on the slow crack growth (SCG) resistance of PE materials. As expected

the experimental result of strain hardening modulus test suggested that the deformation recovery capability during stretching was positively correlated with the SCG resistance for XS10 and XSC50 used in this work. The step-cycle tensile test had the potential to be developed into a supplement for comparison of SCG resistance of PE materials.

关键词

Keywords

references

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