中国塑料 ›› 2010, Vol. 24 ›› Issue (11): 20-25 .DOI: 10.19491/j.issn.1001-9278.2010.11.005

• 材料与性能 • 上一篇    下一篇

流动场下含β成核剂的玻璃纤维增强聚丙烯复合材料结构与性能研究

张正驰 陈妍慧 李忠明 唐建华   

  1. 四川大学高分子科学与工程学院 四川大学 四川大学
  • 收稿日期:2010-08-09 修回日期:1900-01-01 出版日期:2010-11-26 发布日期:2010-11-26

Structure and Properties of Glass Fiber Reinforced Isotactic Polypropylene Modified by β-nucleating Agent Under Flow Field

  

  • Received:2010-08-09 Revised:1900-01-01 Online:2010-11-26 Published:2010-11-26

摘要: 采用普通注射成型和动态保压注射成型分别制备了不同玻璃纤维(GF)含量和β成核剂含量的等规聚丙烯(iPP)复合材料,测试了复合材料的力学性能,并采用二维广角X射线衍射、扫描电子显微镜和二维小角X射线散射研究了复合材料的iPP分子链取向、GF取向及结晶性能。结果表明,在动态保压注射成型条件下,GF含量为30 %(质量分数,下同)、β成核剂含量为0.2 %时,复合材料具有最优异的综合性能,拉伸强度为58.52 MPa,冲击强度为9.26 kJ/m2,这是由于在流动场下含GF与β成核剂的复合材料形成了"皮刚芯韧"类竹子的仿生结构。

关键词: 等规聚丙烯, 玻璃纤维, 成核剂, 复合材料, 动态保压注射成型, 结构

Abstract: Isotactic polypropylene containing β-nucleating agent and glass fiber was prepared by conventional injection molding (CIM) and dynamic packing injection molding (DPIM), respectively. Molecular orientation of iPP, GF orientation, and crystallization behavior were characterized by wide angle X-ray diffraction (WAXD), scanning electronic microscopy (SEM), and small angle X-ray scattering (SAXS). It was found that the DPIM sample with 30 wt % GF and 0.2 wt % β-nucleating agent had the best mechanical properties, with the tensile strength achieved 58.52 MPa and the impact strength 9.26 kJ/m2. This could be attributed to the bamboo-like 'hard skin, soft core' bionic structure formed in the samples.

Key words: isotactic polypropylene, glass fiber, nucleating agent, composite, dynamic packing injection molding, structure