纤维增强PET复合材料非等温结晶行为的研究

用差示扫描量热法 (DSC)研究了 PET及增强 PET的非等温结晶动力学 ,结果表明 ,增强纤维的加入能促进 PET的结晶 ,且 Kevlar浆粕和碳纤维的效果较好。玻纤和碳纤维经等离子处理后 ,前者的成核效果下降而碳纤维的成核效果得以提高 ;在体系中加入成核剂能进一步促进 PET的结晶。另外还用偏光显微镜研究了体系的结晶形态 ,发现没有形成横穿晶 ,增强纤维的加入只是起了成核位的作用。

STUDY ON THE NONISOTHERMAL CRYSTALLIZATION BEHAVIORSOF FIBER- REINFORCED PET COMPOSITES

The non- isothermal crystallization kinetics of fiber- reinforced PET is studied by differential scanning calorimetry ( DSC) ,using Ozawa Method to analyze the kinetics data.It is found that the introduction of fibers into PET matrix substantially increase the crystallization of PET with much smaller undercoolings and Avrami exponents.After plasma treating,carbon fiber can enhance the crystallization of PET further but glass fiber is contrary.The undercooling can be further decreased by adding nucleating agents.By using po- larizing light microscope,it is found that the morphology of PET matrix has not been changed by reinforcing fibers,they just enhance the heterogeneous nucleation of PET crystallites.