摘要
采用差示扫描量热法(DSC)研究了不同冷却速率下聚甲醛(POM)以及 POM/热塑性聚氨酯弹性体(TPU)共混物的非等温结晶过程,分别采用 Jeziorny 法、Ozawa 法和 Mo 法进行处理。结果表明:随着冷却速率的增大,POM及其共混物的结晶峰都变宽,结晶峰值温度(T_c)都降低;在相同冷却速率下,POM/TPU 共混物的 T_c 较纯 POM 有所提高;Jeziorny 法和 Mo 法处理非等温结晶过程比较理想,而由于次级结晶的存在 Ozawa 法并不适用;Jeziorny 法和Mo 法处理所得的数据表明,TPU 的加入能够提高 POM 的结晶速率,减小半结晶时间(t_(1/2)),并且导致 POM 的结晶成核和生长发生了改变。
The non-isothermal crystallization behavior of POM and POM/TPU blends were investigated by differential scanning calorimetry （DSC）. The Jeziorny, Ozawa, and Mo methods were employed to analyze the DSC data. The results showed that the width of the crystallization peak was broadened, the crystallization temperature （Tc） decreased with increasing cooling rate. At the same cooling rate, Tc of the blends was higher than that of neat POM. Jeziomy method could well be used to treat the nonisothermal crystallization. It showed that TPU increased the crystallization rate, decreased the half crystallization time （t1/2）, and changed the nucleating mechanism during crystallization of POM. However, Ozawa method did not fit the polymer blends, because it ignored the influence of secondary crystallization.
出处
《中国塑料》
CAS
CSCD
北大核心
2008年第7期42-46,共5页
China Plastics
关键词
聚甲醛
热塑性聚氨酯弹性体
非等温结晶动力学
polyoxymethylene
thermoplastic polyurethane elastomer
non-isothermal crystallization
