PE/多层石墨导热复合材料的制备与性能  

Preparation and Properties of PE/Multilayer Graphite High Thermal Conductive Materials

作　　者：涂文英[1] 张海燕[1] 洪浩群[1] 张琇滨 

机构地区：[1]广东工业大学材料与能源学院,广东广州510006

出　　处：《塑料》2012年第5期73-75,106,共4页Plastics

基　　金：国家自然科学基金(20971027)

摘　　要：PE、GPE为基材,多层石墨、石墨为填料,采用机械混炼法制备高导热塑料复合材料。SEM分析表明PE/多层石墨比GPE/多层石墨复合材料的插层效果更好。研究填料对复合材料的热导率和热稳定性的影响。结果表明:导热复合材料的热导率随填料填充量的增大而增大,多层石墨的填充量达到100%时,热导率为4.15 W.m-1.k-1。并且在相同填充量下PE/多层石墨较之GPE/多层石墨、PE/石墨、GPE/石墨的导热率更高。TGA分析表明:填充多层石墨、石墨的导热塑料复合材料热稳定性高于未填充的PE。经研究提出,形状比(径厚比)大和导热率高的导热填料更易形成导热网链;为了不影响导热填料的分散性,可先使基体材料与填料先混合均匀再增加其韧性、黏度等。With polyethylene （PE） or Polyethylene grafting maleic anhydride （GPE） as the base plastic, filled with muhilayer graphite or graphite,the high thermal conductivity composite were prepared by the method of mechanical blending. SEM analysis showed that the intercalated effect of PE/multilayer graphite was better than GPE/muhilayer graphite. The affect of filler on thermal conductivity and thermal stability of the composite were investigated, and it was found that thermal conductivity of the composite increased with increasing filler loading. The thermal conductivity reached 4.15 W ~ m - l. k - l when the filler loading of multilayer graphite reached 100 % by weight. And the thermal conductivity of PE/muhilayer graphite composite was higher when compared with GPE/multilayer graphite, PE/graphite, GPE/graphite. Thermal gravimetry analysis （TGA） showed that the thermal stability of composites filled with graphite and multilayer graphite were superior to the blank. The research suggested that high shape ratio （diameter divided thickness） and high thermal conductivity of filler were more likely to form thermal conductive nets chain. In order to have no influence on the dispersion of thermal conductive filler, substrate material and thermal conductive filler could be mixed first,then increased composite toughness and viscosity.

关 键 词：多层石墨 石墨 热导率 热稳定性 导热复合材料 

分 类 号：TB332[一般工业技术—材料科学与工程] TQ325.12[化学工程—合成树脂塑料工业]