摘要
以氧化镁、丙烯腈-丁二烯-苯乙烯共聚物(ABS)为原料,通过共混、模压法制备了ABS导热塑料。研究发现氧化镁填充量受粒径影响很大。大粒径氧化镁可以填充到600份,而小粒径氧化镁最高只可达400份。在300份时,小粒径氧化镁填充的导热ABS具有较高的热导率。采用渗滤理论分析热导率与填充体积分数的关系,发现大粒径氧化镁填充的ABS导热塑料在300-600份范围内很好的符合临界体积分数(φc)为0．198的面心立方场点渗滤的渗滤理论。SEM观察到了大粒径氧化镁填充ABS导热塑料中氧化镁颗粒连通的导热路径;小粒径氧化镁填充的 ABS导热塑料在所研究范围内受界面热阻影响,不符合渗滤理论。采用大小粒径氧化镁复配,由小粒径氧化镁填充到大粒径氧化镁导热网络中的空隙可得更好的导热性能。
Thermally conductive ABS was prepared by filling MgO. It was found that the filling capacity was strongly affected by the particles size. MgO of large particle size （44- 420 μm） may be up to 600 phr, while the smaller ones （5-10 μm） less than 400 phr. When the filler content is 300 phr, the thermal conductivity of ABS containing small MgO particles was higher than that containing large ones. A percolation threshold（ Фc）of face center cubic, 0. 198, was observed for the large particle system, which was consistent with the percolation theory. However, small particle system did not show this value. When small and large partides were used together, higher thermal conductivity could be obtained.
出处
《中国塑料》
CAS
CSCD
北大核心
2006年第4期91-94,共4页
China Plastics
基金
广州市科技攻关计划项目(2004Z3-D0161)
关键词
热导率
渗滤理论
界面热阻
氧化镁
丙烯腈-丁二烯-苯乙烯共聚物
thermal conductivity
percolation theory
interfacial thermal resistance
magnesium oxide
acrylnitrile-butadiene-styrene copolymer
