Journal of South China University of Technology (Natural Science Edition) ›› 2014, Vol. 42 ›› Issue (6): 32-39.doi: 10.3969/j.issn.1000-565X.2014.06.006

• Materials Science & Technology • Previous Articles     Next Articles

Visualization Research on Polypropylene Melting Process in Vane Extruder

Zhang Gui- zhen Liu Huan- yu Chen Jia- jia Qu Jin- ping   

  1. National Engineering Research Center of Novel Equipment for Polymer Processing∥The Key Laboratory of Polymer ProcessingEngineering of the Ministry of Education,South China University of Technology,Guangzhou 510640,Guangdong,China
  • Received:2013-08-03 Revised:2014-04-01 Online:2014-06-25 Published:2014-05-01
  • Contact: 瞿金平(1957-)，男，中国工程院院士，教授，博士生导师，主要从事聚合物成型理论及装备研究． E-mail:jpqu@scut.edu.cn
  • About author:张桂珍(1984-)，女，博士，主要从事聚合物成型加工新理论与新装备研究．E-mail:guizhenzhang@scut．edu．cn
  • Supported by:

    国家 “十二五” 科技支撑计划项目(2011BAE15B02);国家 “973” 计划项目(2012CB025902);教育部新世纪优秀人才支持计划项目 (NCET-11-0152);NSFC- 广东省政府联合基金资助项目 ( U1201242);广州市珠江科技新星专项(2011J2200058);华南理工大学中央高校基本科研业务费专项资金资助项目(2014ZB0021)

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Abstract:

The melting process of crystalline polypropylene with different sizes was observed on line by means ofdynamic visualization technique through a self- developed assembled vane extruder,and the melting law and mecha-nism of the polymer were also analyzed.The results show that (1) the melting process in the vane extruder includesthree stages,namely the full- solid melting stage,the solid- rich melting stage and the melt- rich meting stage;(2) in the full- solid and the solid- rich melting stages,solid pellets may generate large plastic deformation,and themelting process is dominated by heat conduction and plastic dissipation heat,while in the melt- rich meting stage,themelting process of solid pellets can be obviously observed,and the melting process is dominated by viscous dissipationheat of the melt; and (3) the number of VPCU groups in the melt- rich meting stage is controlled by the hardest melt-ing pellets (namely the largest pellets),and more VPCU groups are required for the melting of small pellets.

Key words: vane extruder, polypropylene, melting process, visualization