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Main-Chain Smectic Liquid Crystalline Polymer Exhibiting Unusually High Thermal Conductivity in an Isotropic Composite

机译:在各向同性复合材料中具有异常高导热性的主链近交液晶聚合物

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摘要

The thermal conductivity (TC) of an isotropic composite comprising of a main-chain smectic liquid crystalline PB-10 polyester and 50-μm-sized roughly spherical magnesium oxide (MgO) particles is investigated. The increase in the composite TC with higher MgO fractions is steeper than that expected by Bruggeman's theory for the TC of a polydomain PB-10 polyester (0.52 W m~(-1) K~(-1)). When the filler content is larger than 30 vol %, the composite TC approaches a value that can be explained only if the polyester functions as a matrix with 1.0 W m~(-1) K~(-1), which is five times as high as those of isotropic common polymers (0.2 W m~(-1) K~(-1)). Such an unusually high TC for a polymer matrix is attributed to some polymer lamellae that lie parallel to the particle surface and are stacked toward neighboring particles, thus creating effective heat paths between the particles and a continuous thermal network in a composite.
机译:研究了由主链近晶液晶PB-10聚酯和50μm大小的大致球形氧化镁(MgO)颗粒组成的各向同性复合材料的导热系数(TC)。 MgO分数较高的复合材料TC的增加比Bruggeman理论对多域PB-10聚酯(0.52 W m〜(-1)K〜(-1))的TC所期望的增长更为陡峭。当填料含量大于30体积%时,复合材料TC接近仅当聚酯作为具有1.0W m〜(-1)K〜(-1)的基体起作用时才可解释的值,是1.0W m〜(-1)K〜(-1)。与各向同性普通聚合物(0.2 W m〜(-1)K〜(-1))一样高。聚合物基体的这种异常高的TC归因于一些平行于颗粒表面并朝着相邻颗粒堆叠的聚合物薄片,从而在颗粒与复合材料中的连续热网络之间形成了有效的热通道。

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