华南理工大学学报(自然科学版) ›› 2007, Vol. 35 ›› Issue (2): 79-84.

• 材料科学与技术 • 上一篇    下一篇

聚丙烯与三单体固相接枝物的等温结晶行为

洪浩群 何慧贾德民   

  1. 华南理工大学 材料科学与工程学院,广东 广州 510640
  • 收稿日期:2005-11-15 出版日期:2007-02-25 发布日期:2007-02-25
  • 通信作者: 何慧,副教授. E-mail: pshuihe@scut.edu.cn E-mail:polymerscut@yahoo.com.cn
  • 作者简介:洪浩群(1976-),男,博士后,主要从事高分子合成、制备与改性研究.
  • 基金资助:

    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

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

摘要: 采用固相接枝法合成聚丙烯(PP) 与3 种羊休(马来酸肝、甲基丙烯酸甲西旨和丙烯酸丁酣)的固相接枝物,利用傅立叶变换红外光谱研究接枝物的结构,通过差示扫描量热法和偏光显微镜研究固相接枝物的等温结晶行为,采用的raml 方程研究固相接枝物的等温结晶动力学.研究结果表明,接枝物的Avrami 指数n 和PP 的相近,在0-3 之间,说明接枝物存在混合式的成核生长方式.接枝支链充当异相成核剂,提高了成核速率,降低了结晶活化能;同时,接枝支链阻碍了PP 基体的结晶进程,延长了接枝物完成结晶的时间.PP 和PP 接枝物结晶参数的拟合值与实验值基本一致,说明的raml 方程能有效地描述三羊体固相接枝物的等温结晶行为.

关键词: 聚丙烯, 三羊休固相接枝物, 等温结晶Avrami 方程

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