Crosslinking Kinetics of Polyethylene with Small Amount of Peroxide and Its Influence on the Subsequent Crystallization Behaviors

Niu Yan-hua; Liang Wen-bin; Zhang Yin-ling; Chen Xue-lian; Lai Shih-yaw; Li Guang-xian; Wang Du-jin

doi:10.1007/s10118-016-1819-z

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Crosslinking Kinetics of Polyethylene with Small Amount of Peroxide and Its Influence on the Subsequent Crystallization Behaviors

PAPERS | Updated：2021-05-12

- Crosslinking Kinetics of Polyethylene with Small Amount of Peroxide and Its Influence on the Subsequent Crystallization Behaviors
- Chinese Journal of Polymer Science Vol. 34, Issue 9, Pages: 1117-1128(2016)
- Affiliations：
  
  a. College of Polymer Science and Engineering, State Key Laboratory of Polymer Materials Engineering of China, Sichuan University, Chengdu 610065, China
  b. Performance Material Center, National Institute of Clean-and-low-carbon Energy (NICE), Beijing 102209, China
  c. CAS Key Laboratory of Engineering Plastics, Beijing National Laboratory for Molecular Sciences, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China
- Author bio：
  
  Yan-hua Niu(牛艳华),E-mail:yhniu@scu.edu.cn
- Funds：
- DOI：10.1007/s10118-016-1819-z
  CLC：
- Received：01 March 2016，
  
  Revised：2016-3-23，
  
  Accepted：23 March 2016，
  
  Published：05 October 2016
- Accepted：
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Niu Yan-hua, Liang Wen-bin, Zhang Yin-ling, et al. Crosslinking Kinetics of Polyethylene with Small Amount of Peroxide and Its Influence on the Subsequent Crystallization Behaviors[J]. Chinese Journal of Polymer Science, 2016, 34(9): 1117-1128.
DOI：

Niu Yan-hua, Liang Wen-bin, Zhang Yin-ling, et al. Crosslinking Kinetics of Polyethylene with Small Amount of Peroxide and Its Influence on the Subsequent Crystallization Behaviors[J]. Chinese Journal of Polymer Science, 2016, 34(9): 1117-1128. DOI： 10.1007/s10118-016-1819-z.

摘要

Abstract

Crosslinking reactions of high density polyethylene with low peroxide concentrations ranging from 0.1 wt% to 1.0 wt% at temperatures of 170

180 and 190℃ were monitored by rheological measurements. A critical gel forms at the peroxide concentration of 0.2 wt%

where the transition from long chain branching generation to crosslinking network formation could occur. Rheokinetics of crosslinking can be fitted well by Ding-Leonov’s model. The curing rate

at the earlier stage exhibits about 3 times acceleration per 10℃ with increasing temperature

while the equilibrium modulus

′at the fully cured stage is almost independent of temperature. Influences of crosslinking on the subsequent crystallization behaviors were detected by DSC measurements. Above the critical gel concentration

crystallization is largely retarded as evidenced by the lower crystallization temperature

and crystallinity

due to the network formation. The secondary crystallization valley located at the temperature near 80℃ can be observed above the critical concentration

which becomes more evident with the increasing peroxide concentration and curing temperature. This phenomenon provides another evidence of crystallization retardation by the crosslinking network.

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