摘要
利用DSC研究了不同结晶速率下四种具有不同乙烯含量的抗冲共聚聚丙烯的非等温结晶动力学,采用Avrami方程和Avrami-Ozawa方程的结合(莫氏法)分析了非等温结晶动力学,结果表明,四种样品的Avrami指数在5～6范围内,说明具有不同乙烯含量的四种样品中的PP的结晶方式并不随冷却速率的变化而变化.F(T)的值随结晶度的增加而增加,a的值也有相似的变化,但变化不大,表明冷却速率越快,在单位时间内的结晶度越大,结晶方式并无多大变化.
The non-isothermal behaviors for four impact copolymer polypropylenes with different ethylene content under different cooling rates have been studied by DSC. Avrami equation and a combination of Avrami-Ozawa（Mo methods） were used to analyze the non-isothermal crystallization kinetics. The fact that all samples had Avrami exponents in a range of 5～6 implied the mode of PP in impact copolymer polypropylenes with different ethylene content was not changed by varied cooling rates. The value of F（T） increased with increasing degree of crystallinity, and the value of a increased, but not significantly. It showed that the faster of the cooling rate, the higher of the crystallinity at the unit crystallization time. And the crystallization modes did not significantly change.
出处
《高分子材料科学与工程》
EI
CAS
CSCD
北大核心
2005年第6期138-141,145,共5页
Polymer Materials Science & Engineering
基金
国家"973"计划项目资助(G1999064808)
关键词
抗冲共聚聚丙烯
差示扫描量热法
非等温结晶
结晶动力学
结晶度
impact copolymer polypropylene
DSC
Non-isothermal crystallization
crystallization kinetics
degree of crystallinity
