Selectivity of shear flow on chains for the degradation reaction of melt polyolefin elastomer with dicumyl peroxide

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• 作者：Jianye Liu (1)
  Shijun Zhang (1)
  Wei Yu (2)
  Chixing Zhou (2)
  
• 关键词：POE ; Shear flow field ; Degradation ; Selectivity
• 刊名：Colloid & Polymer Science
• 出版年：2014
• 出版时间：December 2014
• 年：2014
• 卷：292
• 期：12
• 页码：3261-3269
• 全文大小：1,322 KB
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• 作者单位：Jianye Liu (1)
  Shijun Zhang (1)
  Wei Yu (2)
  Chixing Zhou (2)
  
  1. SINOPEC Beijing Research Institute of Chemical Industry, Beijing, 100013, People鈥檚 Republic of China
  2. Department of Polymer Science and Engineering, Shanghai Jiao Tong University, Shanghai, 200240, People鈥檚 Republic of China
  
• ISSN：1435-1536

文摘

The degrading behaviors of three kinds of melt polyolefin elastomers (POEs) at presence of dicumyl peroxides (DCPs) in transient shear flow were evaluated at elevated temperature by parallel plate rheometer. The critical shear rates for degradations of all POEs were different from one to another. The rheological and gel permeation chromatograph (GPC) results showed that the degradation was more and more distinct and the duration to achieve one similar level of molecular weight decreased as the shear rate increased. For quantitative information on chain structure, linear viscoelasticity combined with branch-on-branch (BOB) dynamic model was used to predict probable compositions and chain topologies of the modified products, which were reasonably explained by the suggested mechanism of radical reactions and could confirm that there was a kind of selectivity of shear rate on POE chains for degradation. Higher shear rate can enlarge the differences in mobility of the two scission parts and can further increase the possibility of effective degradation on the original chains.