摘要
实验室聚合得到乙烯单元含量分别为0.94%、1.67%、3.00%(摩尔分数,下同)的聚丙烯/乙丙抗冲共聚物(PP/EPR)合金样品,用差示扫描量热法研究了样品的等温结晶和非等温结晶行为。实验结果表明,各样品在不同温度下的等温结晶均符合Avrami方程;同一样品,等温结晶温度越高,结晶所需要的时间就越长,结晶速率越低;非等温结晶时随着降温速率的增加,结晶温度范围变宽并向低温移动;对于不同样品,等温结晶的结晶速率随乙烯单元含量增加而降低,但当乙烯单元含量为3.00%时出现相反的情况,非等温结晶时的结晶温度也有同样的规律。
In this paper, polypropylene/ethylene propylene random copolymer in-situ alloys were prepared with ethylene contents of 0. 94 mol%, 1.67 mol % and 3.00 mol %. Isothermal and nonisothermal crystallization behaviors of the samples were investigated using differential scanning calorimetry （DSC）. The isothermal crystallization data was well fitted with Avrami equation. The higher the crystallization temperature, the lower the crystallization rate. For the non-isothermal crystallization, the range of crystallization temperature became wider and moved to lower temperature with increasing cooling rate. It was also found that the higher the content of ethylene, the lower the crystallization rate of isothermal crystallization, except the content of ethylene was 3.00 mol%, and the crystallization temperature of non-isothermal crystallization had the same regularity.
出处
《中国塑料》
CAS
CSCD
北大核心
2009年第3期19-23,共5页
China Plastics
关键词
聚丙烯
乙丙抗冲共聚物
合金
等温结晶
非等温结晶
Avrami方程
polypropylene ethylene propylene random copolymer alloy isothermal crystallization non-isothermal crystallization Avrami equation
