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首页> 外文期刊>Journal of Applied Polymer Science >Development of thermally conductive polymer matrix composites by foaming-assisted networking of micron- and submicron-scale hexagonal boron nitride
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Development of thermally conductive polymer matrix composites by foaming-assisted networking of micron- and submicron-scale hexagonal boron nitride

机译：通过微米和亚微米级六方氮化硼的发泡辅助网络开发导热聚合物基复合材料

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摘要

Thermally conductive polymer matrix composite (PMC) foams with effective thermal conductivities (k(eff)) higher than their solid counterparts have been developed for the first time. Using a material system consists of low density polyethylene and micron-scale or submicron-scale hexagon boron nitride platelets as a case example, this article demonstrates that foaming-assisted filler networking is a feasible processing strategy to enhance PMC's k(eff), especially at a low hBN loading. Parametric studies were conducted to identify the structure-to-property relationships between foam morphology (e.g., cell population density, cell size, and foam expansion) and the PMC foam's k(eff). In particular, there exists an optimal cell size to maximize the PMC foam's k(eff) for foams with up to 50% volume expansion. However, an optimal cell size is absent for PMC foams with higher volume expansion. X-ray diffraction (XRD) analyses reveal that both the presence of hBN platelets and foam expansion promoted the crystallization of LDPE phase. Moreover, the XRD spectra also provide evidence for the effect of foam expansion on the orientation of hBN platelets. Overall, the findings provide new directions to design and fabricate thermally conductive PMC foams with low filler contents for heat management applications. (C) 2015 Wiley Periodicals, Inc.
机译：具有较高的有效导热系数（k（eff））比其固体对应导热系数高的导热聚合物基复合材料（PMC）泡沫已得到首次开发。以低密度聚乙烯和微米级或亚微米级六方氮化硼薄片组成的材料系统为例，本文证明发泡辅助填料网络是提高PMC的k（eff）的可行加工策略，尤其是在hBN负载低。进行了参数研究，以确定泡沫形态（例如，细胞密度，细胞大小和泡沫膨胀）与PMC泡沫的k（eff）之间的结构与性质的关系。特别是，存在一种最佳的泡孔尺寸，以使PMC泡沫的k（eff）达到最大（体积膨胀高达50％）。然而，对于具有更高体积膨胀的PMC泡沫而言，没有最佳的泡孔尺寸。 X射线衍射（XRD）分析表明，hBN血小板的存在和泡沫膨胀都促进了LDPE相的结晶。此外，XRD光谱还提供了泡沫膨胀对hBN血小板取向的影响的证据。总体而言，这些发现为热管理应用中低填料导热PMC泡沫的设计和制造提供了新的方向。 （C）2015年Wiley Periodicals，Inc.

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