PE—LLD／纳米Al2O3复合材料非等温结晶动力学研究

摘要

采用差示扫描量热法研究了线形低密度聚乙烯（PE-LLD）／纳米氧化铝（Al2O3）复合材料的非等温结晶行为，分别利用Avrami方程和莫志深方程对结晶动力学进行了分析，运用Kissinger方程计算了结晶过程中的活化能。结果表明，添加5％（质量分数，下同）和10％的纳米Al2O3，在PE-LLD的非等温结晶过程中起到的异相成核作用较为微弱，PKLLD／纳米Al2O3复合材料的结晶起始温度、峰值温度和结晶速率均较PE-LLD略有提高，但结晶活化能有所降低。%Non-isothermal crystallization behavior of linear low density polyethylene (PE-LLD)/ nano-Al2O3 composites was investigated using differential scanning calorimetry. The nonisothermal crystallization kinetics was analyzed with Avrami and Mo methods. Kissinger method was used to estimate the activation energy for non-isothermal crystallization. When the content of nano-Al2O3 was between 5 % and 10 %, the heterogeneous nucleation in the crystallization process of PE-LLD was sufficient, the crystallization onset temperature, peak temperature, and crystallization rate increased only slightly. The addition of nano-Al2 O3 decreased the activation energy of PE-LLD.