聚甲醛/共聚酰胺共混物的非等温结晶动力学研究

Study on Non-isothermal Crystallization Kinetics of POM/COPA Blends

采用差示扫描量热法(DSC)研究了聚甲醛(POM)和聚甲醛/盐聚酰胺(POM/COPA)二元共混体系在不同降温速率下的非等温结晶行为,并用 Jeziorny 法、Ozawa 法和莫志深法计算了聚甲醛及其共混物的非等温结晶动力学参数。结果表明:提高降温速率,POM 和 POM/COPA 共混物的结晶峰均向低温方向移动,且结晶放热峰逐渐变宽;COPA 的加入使 POM 的结晶温度提高、结晶速率加快,在体系中起到了异相成核的作用;Jeziomy 法和莫志深法处理该体系的非等温结晶过程比 Ozawa 法更为合适。

The non-isothermal crystallization kinetics of polyoxymethylene （POM） and polyoxymethylene/co-polyamide （POM/COPA） at different cooling rates were investigated uisng differential scanning calorimetry （DSC）. The parameters of non-isothermal crystallization kinetics were obtained through Jeziorny, Ozawa, and MO methods. It showed that the increase of cooling rates made the crystallization peaks of POM and POM/COPA moved towards lower temperature and became wider. The addition of COPA increased the crystallization temperature and accelerated the crystallization rate. COPA played a role as a nucleating agent for non-isothermal crystallization of POM. Both Jeziorny and MO methods described this system very well.