纳米SiO2填充LLDPE复合材料耐热性的研究

采用DSC方法研究了纳米二氧化硅(SiO2)填充线性低密度聚乙烯(LLDPE)的熔融特性。结果表明：填充LLDPE的高温熔融峰峰值温度Tm2变化不大，低温熔融峰温Tml则随着纳米SiO2用量的增加明显向低温偏移，显示出纳米粒子的异相成核作用；在纳米SiO2用量相同的情况下，与表面未处理SiO2及经表面偶联剂处理纳米SiO2填充体系相比较，加有大分子相容剂的体系的Tml和Tm2均有所下降，同时熔融峰宽化；填充LLDPE的热变形温度HDT和软化温度Tg均随纳米SiO2用量的增加而提高；与表面未处理填充体系相比，硅烷偶联剂处理纳米SiO2填充体系的HDT有所上升，加有大分子相容剂的体系的HDT上升则更为明显。

Study of Heat Resistance of LLDPE Filled with Nano-scale SiO2

The melt property of LLDPE filled with nano-scale SiO 2 was studied.The results indicated that T m2 changed little and T m1 decreased with the increase of the content of nano-scale SiO 2.The T m2 and T m1 of the system added with macromolecular compatibilizer decreased and the melting peak widened compared with those of the system without compatibilizer.Compared to the system filled with nano-scale SiO 2 treated with a silane coupling agent,the HDT and T s of the filled system increased with the increase of the content of nano-scale SiO 2.The study of thermal deformation demonstrated that both HDT and T s increased with increasing of SiO 2 content.Compared with the LLDPE filled with non-surface treated nano-scale SiO 2,the HDT of the system filled with silane coupling agents treated nano-scale SiO 2 increased and the HDT of the system filled with macromolecular compatibilizer was more higher.