Journal of South China University of Technology (Natural Science Edition) ›› 2007, Vol. 35 ›› Issue (2): 79-84.

• Materials Science & Technology • Previous Articles     Next Articles

Isothermal Crystallization Behaviour of Ternary-Monomer Solid-Phase Graft Polypropylene

Hong Hao-qun  He Hui  Jia De-min   

  1. School of Materials Science and Engineering , South China Univ. of Tech. , Guangzhou 510640 , Guangdong , China
  • Received:2005-11-15 Online:2007-02-25 Published:2007-02-25
  • Contact: 何慧，副教授. E-mail: pshuihe@scut.edu.cn E-mail:polymerscut@yahoo.com.cn
  • About author:洪浩群(1976-)，男，博士后，主要从事高分子合成、制备与改性研究.
  • Supported by:

    国家自然科学基金资助项目( 20304003 ) ;广东省自然科学基金资助项目(039172) ;华南理工大学博士后创新科学基金资助项目

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Abstract:

Temary-monomer solid-phase graft polypropylene (PPTM) was synthesized by the solid-phase grafting of maleic anhydride , methyl methacrylate and butyl acrylate onto polypropylene (PP). Then , the structure of PPTM was investigated by means of Fourier infrared spectroscopy , the isothermal crystallization behaviour of PPTM was studied by using the differential scanning calorimetry and the polarizing microscope , and the isothermal crystalliza-tion kinetics of PPTM was revealed via A vrami equation. The results show that (1) the A vrami index n of PPTM ,which approximates that of PP , is within the range of 0 to 3 , indicating that PPTM has a complex nucleation; (2)the grafted branch chains act as the heterogeneous nuclei , thus increasing the nucleation rate and decreasing the ac-tivation energy of crystallization; (3) the grafted branch chains hinder the crystallization of the PP chains , thus de-laying the PPTM crystallization; and (4) the fitted isothermal crystallization parameters of PP and PPTM prove to be consistent with the experimental data , which indicates the effectiveness of A vrami equation in describing the iso-thermal crγstallization behaviour of PPTM.

Key words: polypropylene, temary-monomer solid-phase graft, isothermal crystallization, Avrami equation