Non-isothermal crystallization behavior of dynamically vulcanized long chain branched polypropylene/ethylene-propylene-diene monomer blends

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• 作者：Zinan Zhang ; Fengyuan Yu ; Wei Yu ; Hongbin Zhang
• 关键词：Crystallization ; Polyolefins ; Rheology ; Thermoplastics ; Elastomers
• 刊名：Journal of Polymer Research
• 出版年：2015
• 出版时间：October 2015
• 年：2015
• 卷：22
• 期：10
• 全文大小：2,132 KB
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• 作者单位：Zinan Zhang (1)
  Fengyuan Yu (1)
  Wei Yu (1)
  Hongbin Zhang (1)
  
  1. Advanced Rheology Institute, Department of Polymer Science and Engineering, School of Chemistry and Chemical Engineering, Shanghai Jiao Tong University, Shanghai, 200240, People鈥檚 Republic of China
  
• 刊物类别：Chemistry and Materials Science
• 刊物主题：Chemistry
  Polymer Sciences
  Industrial Chemistry and Chemical Engineering
  Characterization and Evaluation Materials
  
• 出版者：Springer Netherlands
• ISSN：1572-8935

文摘

The non-isothermal crystallization behaviors of long chain branched isotactic polypropylene (LCB PP), dynamically vulcanized LCB PP/ethylene-propylene-diene monomer (EPDM) blends at various weight ratios were investigated by DSC, rheology and optical microscopy. LCB PP/EPDM blends were found to show a different crystallization behavior in comparison with linear PP/EPDM blends, showing a minimum in the peak temperature of crystallization with increasing the content of EPDM while the latter showing a maximum. The nucleation and the crystallization kinetics of PP were induced and accelerated by long chain branches and EPDM. The acceleration of crystallization kinetics of LCB PP induced by LCB structures was attributed to the grafted efficient nucleation agent. The influence of EDPM on the crystallization combines the effects of enhancement and retardation, depending on its content in the blends. Based on the thermodynamics theory of crystallization, a modified crystallization model was developed to reveal the crystallization mechanism of LCB PP/EPDM blends. Keywords Crystallization Polyolefins Rheology Thermoplastics Elastomers