中国塑料 ›› 2010, Vol. 24 ›› Issue (05): 51-58 .DOI: 10.19491/j.issn.1001-9278.2010.05.012

• 材料与性能 • 上一篇    下一篇

PP/纳米TiO2复合材料的晶体形貌和非等温结晶行为

伍玉娇 何辉 蒙日亮 刘昌贵 蔡启军   

  1. 贵州大学材料与冶金学院
  • 收稿日期:2010-01-18 修回日期:2010-03-16 出版日期:2010-05-26 发布日期:2010-05-26

Nonisothermal Crystallization Behaviors and Crystal Morphology of PP/Nano-TiO2 Composites

  

  • Received:2010-01-18 Revised:2010-03-16 Online:2010-05-26 Published:2010-05-26

摘要: 用熔融共混法制备了聚丙烯(PP)/纳米TiO2复合材料,用透射电子显微镜、偏光显微镜、差示扫描量热仪和广角X射线衍射仪对其纳米粒子分散性、晶体形貌和非等温结晶行为进行了研究。结果表明,纳米TiO2以纳米级尺寸均匀分散于PP基体中;130 ℃冷却和室温冷却时,PP/纳米TiO2复合材料的晶粒比纯PP的细,并且随着纳米TiO2含量的增加,PP/纳米TiO2复合材料的晶粒尺寸先减小后增大,纳米TiO2含量为2 %(质量分数,下同)时晶粒最细;纳米TiO2对PP结晶具有加速作用;复合材料的结晶活化能高于纯PP的,并且纳米TiO2含量多且均匀时复合材料结晶活化能高;纳米TiO2含量较少时可诱导较多的β晶生成,当纳米TiO2含量为1 %时,复合材料中β晶含量达到25.2 %。

关键词: 聚丙烯, 纳米TiO2, 非等温结晶, 复合材料, 晶体形貌

Abstract: The polypropylene(PP)/nano-TiO2 composites were prepared via melt mixing. The dispersion of nano-TiO2, spherulitic morphology, and nonisothermal crystallization behavior of PP were studied using transmission electron microscopy (TEM), polarized optical microscope (POM) ,differential scanning calorimetry (DSC), and wide angle X-ray diffraction (WAXD). Results showed that nano-TiO2 dispersed uniformly in the nanoscale in PP. The spherulites in PP/nano-TiO2 composite was smaller than that in neat PP. With increasing content of nano-TiO2 , the size of spherulites decreased firstly and then increased. When the content of nano-TiO2 was 2 %, the spherulites of PP/nano-TiO2 composite was the smallest. The addition of nano-TiO2 accelerated the crystallization rate of PP. Nano-TiO2 promoted the formation of β crystals , when the content of nano-TiO2 was 1 %, the content of β crystal in the composite reached 25.2 %.

Key words: polypropylene, nano-titanium dioxide, nonisothermal, composite, crystal morphology

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