摘要
利用差示扫描量热仪结合Avrami方程研究了玻璃纤维(GF)增强聚丙烯(PP)复合体系的非等温结晶动力学,探讨了GF含量及长度对PP结晶行为的影响。通过偏光显微镜观察了复合材料的结晶形态。结果表明,引入GF改变了PP的结晶温度,对其结晶有成核作用,并随着GF含量的增加,PP的半结晶时间(t1/2)呈下降趋势,结晶速率逐渐上升;同时随着GF长度的增加,PP的结晶速率是先增大后减小。PP和PP/GF复合材料的Avrami指数均在2.99～3.40,说明PP的结晶成核机理和生长方式没有改变。
The influence of glass fiber content and length on non-isothermal crystallization behavior of PP was investigated. The crystalline morphology was examined using polarized optical microscope. It showed that the glass fibers provided nucleating sites for crystallization. With increasing glass fiber content, the crystallization rate increased gradually and tl/2 decreased. As the length of glass fiber increased, the crystallization rate increased first and then decreased. The Avrami exponent was in the range of 2. 9943. 40, which implied the nucleation mechanism and geometry of crystal growth of PP was not changed.
出处
《中国塑料》
CAS
CSCD
北大核心
2012年第12期62-65,共4页
China Plastics
关键词
聚丙烯
玻璃纤维
非等温结晶动力学
结晶速率
polypropylene
glass fiber
non-isothermal crystallization kinetics
crystallization rate
