PE—LLD／纳米CaCO3复合材料非等温结晶动力学研究

摘要

利用DSC研究线形低密度聚乙烯（PDLLD）和PE—LLD／纳米碳酸钙（PDLLD／Nano—CaCO3）复合材料的非等温结品行为．并用Jeziorny法和莫志深法对所得的数据进行动力学分析。结果表明．Jeziorny法、莫志深法能够较好地处理非等温结晶过程。用Jeziorny法处理结果表明，PE-LLD的结晶速率大于PDLLD／Nano—CaCO3复合材料；在相同的降温速率下，Nano—CaCO3加入使得复合体系结晶速率先略微下降后再升高，且当Nano-CaCO3的质量分数为10％时，复合体系的结晶速率最低。Avrami指数n在1．47～2．13之间变化。用莫志深法得出的结论与Jeziorny法一致，b值在0．75～1．22之间变化。%The PE-I.I.D/nano-CaCO3 composites were prepared through melting mixing using a two-roll plasticator. Nonisothermal crystallization behaviors of neat PE-LLD and the composites were studied by means of differential scanning calorimetry. Jeziorny and Mo methods were used to analyze the data. It showed that both Jeziorny and Mo methods could describe this system very well. According to the Jeziorny method, nano-CaCO3 increased the value of To. At the same time, the values of (To--Tp) and t1/2 also increased. This meant that the crystallization rate of PE-LLD was faster than that of PE-LI.D/nano-CaCO3. For a given cooling rate, with increase of the content of nano-CaCO3, the value of crystallization rate decreased at first, then increased. When the content of nano-CaCO3 was 10 %, the value of crystallization rate was the lowest. The value of 77 changed from 1.47 to 2. 13. The conclusion of Mols was the same as that of Jeziorny's. The value of b changed from 0. 75 to 1.22.