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首页> 外文期刊>Nanotechnology >Thermally conductive, electrically insulating and melt-processable polystyrene/boron nitride nanocomposites prepared by in situ reversible addition fragmentation chain transfer polymerization
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Thermally conductive, electrically insulating and melt-processable polystyrene/boron nitride nanocomposites prepared by in situ reversible addition fragmentation chain transfer polymerization

机译：通过原位可逆加成裂解链转移聚合制备的导热，电绝缘和可熔融加工的聚苯乙烯/氮化硼纳米复合材料

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摘要

Thermally conductive and electrically insulating polymer/boron nitride (BN) nanocomposites are highly attractive for various applications in many thermal management fields. However, so far most of the preparation methods for polymer/BN nanocomposites have usually caused difficulties in the material post processing. Here, an in situ grafting approach is designed to fabricate thermally conductive, electrically insulating and post-melt processable polystyrene (PS)/BN nanosphere (BNNS) nanocomposites by initiating styrene (St) on the surface functionalized BNNSs via reversible addition fragmentation chain transfer polymerization. The nanocomposites exhibit significantly enhanced thermal conductivity. For example, at a St/BN feeding ratio of 5:1, an enhancement ratio of 1375% is achieved in comparison with pure PS. Moreover, the dielectric properties of the nanocomposites show a desirable weak dependence on frequency, and the dielectric loss tangent of the nanocomposites remains at a very low level. More importantly, the nanocomposites can be subjected to multiple melt processing to form different shapes. Our method can become a universal approach to prepare thermally conductive, electrically insulating and melt-processable polymer nanocomposites with diverse monomers and nanofillers.
机译：导热和电绝缘的聚合物/氮化硼（BN）纳米复合材料在许多热管理领域的各种应用中具有很高的吸引力。然而，到目前为止，大多数聚合物/ BN纳米复合材料的制备方法通常在材料后处理中造成困难。在这里，一种原位接枝方法被设计为通过可逆的加成断裂链转移聚合反应在表面官能化的BNNS上引发苯乙烯（St），从而制造导热，电绝缘和可后熔融加工的聚苯乙烯（PS）/ BN纳米球（BNNS）纳米复合材料。 。纳米复合材料表现出显着增强的导热性。例如，在St / BN进料比为5：1的情况下，与纯PS相比，可实现1375％的增强率。此外，纳米复合材料的介电性质显示出对频率的期望的弱依赖性，并且纳米复合材料的介电损耗角正切保持在非常低的水平。更重要的是，可以对纳米复合材料进行多次熔融加工以形成不同的形状。我们的方法可以成为制备具有多种单体和纳米填料的导热，电绝缘和可熔融加工的聚合物纳米复合材料的通用方法。

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