Supercritical CO2 in controlling phase morphology of polypropylene/polystyrene blends and the corresponding mechanical properties and foamability

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• 作者：Kun Wang ; Shusheng Wang ; Fei Wu ; Yongyan Pang ; Wentao Zhai ; Wenge Zheng
• 关键词：Supercritical CO2 ; Phase morphology ; PP/PS blends ; Mechanical properties ; Foamability
• 刊名：Polymer Bulletin
• 出版年：2016
• 出版时间：April 2016
• 年：2016
• 卷：73
• 期：4
• 页码：941-957
• 全文大小：2,002 KB
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• 作者单位：Kun Wang (1)
  Shusheng Wang (1)
  Fei Wu (1)
  Yongyan Pang (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
  Polymer Sciences
  Characterization and Evaluation Materials
  Soft Matter and Complex Fluids
  Physical Chemistry
  
• 出版者：Springer Berlin / Heidelberg
• ISSN：1436-2449

文摘

The objective of this study was to investigate the effect of supercritical carbon dioxide (scCO₂) during continuous extrusion on controlling phase structure of polypropylene (PP)/polystyrene (PS) blends and the corresponding mechanical properties and foamability. Viscosity reduction of PP and PS was studied using a slit die rheometer attached to a tandem extrusion system. The scCO₂ was injected at 2.0, 4.0 and 6.0 wt% to PP/PS blends during extrusion. It was found that a sharp decrease in the size of the dispersed phase was achieved with the injection of scCO₂. The size of the minor phase for 75/25 PP-2/PS blend with 4.0 wt% scCO₂ was significantly reduced to 50 nm, due to the viscosity ratio of PP-2 to PS close to one. The mechanical properties of the polymer blends were closely related to the phase structure, and better dispersion favored enhanced mechanical properties. Foamability of the PP/PS blends was also found to be closely dependent on phase morphology, and better dispersion endorsed uniform cell structure with smaller cell size and high cell densities.