A new strategy for preparation of long-chain branched polypropylene via reactive extrusion with supercritical CO2 designed for an improved foaming approach

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• 作者：Kun Wang ; Shusheng Wang ; Fei Wu ; Yongyan Pang ; Wei Liu…
• 刊名：Journal of Materials Science
• 出版年：2016
• 出版时间：March 2016
• 年：2016
• 卷：51
• 期：5
• 页码：2705-2715
• 全文大小：1,615 KB
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• 作者单位：Kun Wang (1)
  Shusheng Wang (1)
  Fei Wu (1)
  Yongyan Pang (1)
  Wei Liu (1)
  Wentao Zhai (1)
  Wenge Zheng (1)
  
  1. Ningbo Key Laboratory of Polymer Materials, Polymers and Composites Division, Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, 1219 Zhongguan West Road, Ningbo, 315201, Zhejiang, China
  
• 刊物类别：Chemistry and Materials Science
• 刊物主题：Chemistry
  Materials Science
  Characterization and Evaluation Materials
  Polymer Sciences
  Continuum Mechanics and Mechanics of Materials
  Crystallography
  Mechanics
  
• 出版者：Springer Netherlands
• ISSN：1573-4803

文摘

A novel strategy was designed for the preparation of a long-chain branched polypropylene (PP) with improved foamability via reactive extrusion in the presence of supercritical CO₂ (scCO₂). Benzoyl peroxide was used as a radical initiator and trimethylolpropane triacrylate (TMPTA) was applied as a polyfunctional reactive monomer during extrusion. Fourier transform infrared spectroscopy and high temperature GPC confirmed that TMPTA was grafted onto PP chains, and the presence of scCO₂ promoted the grafting and branching reactions, and hindered polymer degradation. A possible mechanism was proposed to explain the effect of scCO₂ on the branching reactions. In addition, rheological behavior of pure PP and modified PP samples was studied to investigate the effect of long chain branching of PP on the melt viscosity and strength, and foaming behavior was studied to confirm the subsequent effect on its foamability. It was found that the long chain branching increased the melt viscosity and strength of modified PP samples, which favored the foamability, and that the foaming windows were expanded in the presence of scCO₂. Thus, it provided an advanced foaming approach via preparation of long-chain branched PP through reactive extrusion with scCO₂ both working as the reactive medium and the foaming agent.