LLDPE/H-HIPS的非等温结晶动力学研究

摘要

采用差示扫描量热法研究了不同降温速率下线性低密度聚乙烯(LLDPE)和 LLDPE/H-HIPS(氢化高抗冲聚苯乙烯)共混物的非等温结晶行为,并用Jeziorny法进行处理分析。结果表明：降温速率的增大会使得以上两种样品的结晶峰均向温度较低的方向移动,LLDPE/H-HIPS共混物的结晶峰向低温方向移动的同时结晶峰逐渐变宽,结晶焓减小；在相同降温速率下,LLDPE/H-HIPS共混物的峰值结晶温度较纯 LLDPE有所降低；LLDPE/H-HIPS的 Avrami指数n的起始值增大且范围变窄；由Kissinger法估算的 LLDPE和 LLDPE/H-HIPS的结晶活化能分别为309.45,326.63 kJ/mol。%The non-isothermal crystallization behavior of LLDPE and LLDPE/H-HIPS was studied by differential scanning calorimeter at different cooling rates.Jeziorny method was used to study the non-isothermal crystallization of LLDPE and LLDPE/H-HIPS.The results show that the crystallization peaks of LLDPE and LLDPE/H-HIPS move to lower temperature with the increasing of the cooling rate,and the crystallization peak of LLDPE/H-HIPS blends gradually becomes wider and the crystallization enthalpy of LLDPE/H-HIPS decreases.The peak crystallization temperature of LLDPE/H-HIPS is smaller than that of LLDPE at the same cooling rate.The initial value of Avrami index (n)of LL-DPE/H-HIPS increases and the scope becames narrow.The crystallization activation en-ergies of LLDPE and LLDPE/H-HIPS are respectively 309.45 and 326.63 kJ/mol esti-mated by Kissinger method.