Study On Preparation And Structure Properties Of High Pliable And Thermal Conductive Elastomer Composite

With the rapid development of electronic technology, the fixed density of electronic components is increasing, which provides better used function and leads to the drastically increase of heat. While in the field of microelectronic, thermal management is a new subject, which to research distributed heat style and components and materials of every kind of electronic components. Thermal interface material (TIM) has an important role in the thermal management and is an important research subject. Thermal conductive elastomer materials as a kind of TIM have been applied in the many electronic products such as drives, hard disks and note computers, but have a better distributed heat effect when used in the high fixed pressure. In order to fill the gap between electronic components and distributed heat appliances with TIM, the more compliance materials is, the better. Therefore, elastomer composites which have better compliance is a key technological problem when elastomer composites are filled with a lot of fillers. In this paper, thermal conductive alumina (A12O3)/silicone rubber (SiR) composite was prepared by melt blending. Thermal conductivity and mechanical properties are also studied. The main works are as follow:(1) The effect of the networks of thermal fillers and cross-linking density on thermal conductivity of Al2O3/SiR were studied systematically:the thermal conductivity of composite was raised most obviously with increasing alumina loading during the evolution course from local filler-network structure to full-scale one. The cross-linking density had no much influence on the thermal conductivity. However, when the cross-linking density was very lower, the thermal conductivity would be decreased slightly;(2) The effect of the networks of thermal fillers and cross-linking density on mechanical properties of Al2O3/SiR was studied systematically:both the filler-network structure of Al2O3and the cross-linking density played an important role in the mechanical performances.(3)(3) The effect of tropism of Al2O3on thermal conductivity of composites was studied systematically:as for anisotropy alumina, the factors affecting thermal conductivity anisotropy include crystal face tropism, thermal conductive network tropism and quantity of touch point between crystal face. While as for isotropy alumina, the factor affecting thermal conductivity anisotropy is only thermal conductive network tropism. In addition, viscosity also had an effect on the three factors above;(4) When silicone rubber was filled with alumina disposed by surface disposed reagent and ball alumina, the satisfied properties of composites could be reached:thermal conductivity1.21W/m.K and hardness shore A8.