The Role of Mold Temperature on Morphology and Mechanical Properties of PE Pipe Produced by Rotational Shear

Zu-Chen Du; Hao Yang; Xie-Huai Luo; Ze-Xiang Xie; Qiang Fu; Xue-Qin Gao

doi:10.1007/s10118-020-2363-4

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The Role of Mold Temperature on Morphology and Mechanical Properties of PE Pipe Produced by Rotational Shear

ARTICLE | Updated：2019-12-04

- The Role of Mold Temperature on Morphology and Mechanical Properties of PE Pipe Produced by Rotational Shear
- Chinese Journal of Polymer Science Vol. 38, Issue 6, Pages: 653-664(2020)
- Affiliations：
  
  College of Polymer Science and Engineering, Sichuan University, Chengdu 610065, China
- Author bio：
  
  gaoxueqin@scu.edu.cn
- Funds：
- DOI：10.1007/s10118-020-2363-4
  CLC：
- Received：07 September 2019，
  
  Revised：2019-9-28，
  
  Accepted：13 October 2019，
  
  Online First：04 December 2019，
  
  Published：2020-06
- Accepted：
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Du, Z. C.; Yang, H.; Luo, X. H.; Xie, Z. X.; Fu, Q.; Gao, X. Q. The role of mold temperature on morphology and mechanical properties of PE pipe produced by rotational shear. Chinese J. Polym. Sci. 2020, 38, 653–664

Zu-Chen Du, Hao Yang, Xie-Huai Luo, et al. The Role of Mold Temperature on Morphology and Mechanical Properties of PE Pipe Produced by Rotational Shear[J]. Chinese Journal of Polymer Science, 2020, 38(6): 653-664.
Du, Z. C.; Yang, H.; Luo, X. H.; Xie, Z. X.; Fu, Q.; Gao, X. Q. The role of mold temperature on morphology and mechanical properties of PE pipe produced by rotational shear. Chinese J. Polym. Sci. 2020, 38, 653–664 DOI： 10.1007/s10118-020-2363-4.

Zu-Chen Du, Hao Yang, Xie-Huai Luo, et al. The Role of Mold Temperature on Morphology and Mechanical Properties of PE Pipe Produced by Rotational Shear[J]. Chinese Journal of Polymer Science, 2020, 38(6): 653-664. DOI： 10.1007/s10118-020-2363-4.

摘要

Abstract

The role of mold temperature on the morphology and properties of rotational shearing polyethylene (PE) pipes was studied

via

a self-developed rotational shear system (RSS). The result indicated that when the mold temperature was 150 °C

the hoop tensile strength and Vicat softening temperature were enhanced rapidly

which were 383.6% and 137.9% higher than those of the conventional PE pipes

respectively. Morphology and crystal structure studies by SEM and DSC revealed that once the rotational shear was applied

the shish-kebab structure began to appear. With the increase of the mold temperature

due to the relaxation of most of the oriented molecular chains

the preservation of shish-kebab structure became difficult. When the mold temperature was 190 °C

only the inner layer of the pipes

where the cooling rate was the largest

could preserve the shish-kebab structure. According to WAXD

there was less shish structure

and the growth of kebab was distorted in the inner layer of the pipes at 210 °C. The result of SAXS suggested that the length of shish changed most within the temperature range from 170 °C to 190 °C. The results of DSC and WAXD showed less change in crystallinity and degree of orientation between the two temperatures. It can be concluded that the reduction of shish length leads to a decrease in mechanical properties and heat-resistance.

关键词

Keywords

references

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