Correlation between chain microstructure and mechanical properties of two polypropylene/poly (ethylene-co-propylene) in-reactor alloys

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• 作者：Rongbo Li (1) (2)
  Qian Xing (3)
  Ying Zhao (1)
  Dujin Wang (1)
  Xuteng Hu (2)
  
  1. Beijing National Laboratory for Molecular Sciences ; CAS Key Laboratory of Engineering Plastics ; Institute of Chemistry ; Chinese Academy of Sciences ; Beijing ; 100190 ; People鈥檚 Republic of China
  2. Petrochina Petrochemical Research Institute ; Beijing ; 100195 ; People鈥檚 Republic of China
  3. School of Chemistry and Chemical Engineering ; University of Chinese Academy of Sciences ; Beijing ; 100049 ; People鈥檚 Republic of China
  
• 关键词：Polypropylene in ; reactor alloy ; Microstructure ; Mechanical properties ; Cross fractionation
• 刊名：Colloid & Polymer Science
• 出版年：2015
• 出版时间：April 2015
• 年：2015
• 卷：293
• 期：4
• 页码：1011-1021
• 全文大小：1,759 KB
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• 刊物类别：Chemistry and Materials Science
• 刊物主题：Chemistry
  Polymer Sciences
  Physical Chemistry
  Soft Matter and Complex Fluids
  Characterization and Evaluation Materials
  Food Science
  
• 出版者：Springer Berlin / Heidelberg
• ISSN：1435-1536

文摘

This study concentrated on evaluating the structure-property correlation of two polypropylene/poly (ethylene-co-propylene) in-reactor alloys (A and B). Systematic investigation and comparison have been performed on the molecular structure and phase morphology of the polypropylene (PP)-based alloys. Especially, the bivariate distribution of chemical composition and molecular weight for each fraction was obtained simultaneously by adopting cross fractionation chromatography. The results illustrated the following structure difference which determines the ultimate mechanical properties of the PP in-reactor alloys. It has been found that the relative content of components polypropylene homopolymer (HPP) and ethylene-co-propylene random copolymer (EPR) is a little more in sample A than those in sample B, and meanwhile both of them in sample A show higher molecular weight and broader molecular weight distribution. Furthermore, the fraction of HPP in sample A eluted at a higher temperature, meaning that this fraction possesses better stereo-tacticity and can form more perfect crystals with higher crystallinity. These advantages in structure characteristics endow sample A with better rigidity-toughness balance than sample B.