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首页> 外文期刊>Journal of Applied Polymer Science >Enhanced mechanical and anisotropic thermal conductive properties of polyimide nanocomposite films reinforced with hexagonal boron nitride nanosheets
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Enhanced mechanical and anisotropic thermal conductive properties of polyimide nanocomposite films reinforced with hexagonal boron nitride nanosheets

机译：用六边形氮化硼纳米液加固的聚酰亚胺纳米复合膜的增强机械和各向异性导热性能

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摘要

To attain thermally conductive but electrically insulating polymer films, in this study, polyimide (PI) nanocomposite films with 1-30 wt% functionalized hexagonal boron nitride nanosheets (BNNSs) were fabricated via solution casting and following imidization. The microstructures, mechanical and thermal conductive properties of PI/BNNS nanocomposite films were examined by taking account of the relative content, anisotropic orientation, and interfacial interaction of BNNS and PI matrix. The scanning electron microscopy, X-ray photoelectron spectroscopy, Fourier transform infrared spectroscopy, and X-ray diffractometry data revealed that BNNSs with hydroxy and amino functional groups have specific molecular interactions with PI matrix and they form stacked aggregates in the nanocomposite films with high BNNS loadings of 10-30 wt%. The tensile mechanical strength/modulus, thermal degradation temperatures, and thermal conductivity of the nanocomposite films were found to be significantly enhanced with increasing the BNNS loadings. For the nanocomposite films with 1-30 wt% BNNS loadings, the in-plane thermal conductivity was measured to be 1.82-2.38 W/mK, which were much higher than the out-of-plane values of 0.35-1.14 W/mK. The significant anisotropic thermal conductivity of the nanocomposite films was found to be owing to the synergistic anisotropic orientation effects of both BNNS and PI matrix. It is noticeable that the in-plane and out-of-plane thermal conductivity values of the nanocomposite film with 30 wt% BNNS were similar to 1.31 and similar to 3.35 times higher than those of neat PI film, respectively.
机译：为了获得导热但电绝缘的聚合物薄膜，在本研究中，通过溶液浇铸和亚胺化制备了含1-30 wt%功能化六角氮化硼纳米片（BNNSs）的聚酰亚胺（PI）纳米复合薄膜。通过考虑BNNS和PI基体的相对含量、各向异性取向和界面相互作用，研究了PI/BNNS纳米复合薄膜的微观结构、力学性能和导热性能。扫描电子显微镜、X射线光电子能谱、傅里叶变换红外光谱和X射线衍射数据显示，含羟基和氨基官能团的BNNS与PI基体具有特定的分子相互作用，并在高BNNS负载量为10-30 wt%的纳米复合膜中形成堆积聚集体。研究发现，随着BNN负载量的增加，纳米复合薄膜的拉伸机械强度/模量、热降解温度和热导率显著提高。对于BNNS含量为1-30 wt%的纳米复合薄膜，测量的面内热导率为1.82-2.38 W/mK，远高于0.35-1.14 W/mK的面外热导率。发现纳米复合薄膜的显著各向异性热导率是由于BNNS和PI基体的协同各向异性取向效应。值得注意的是，含有30 wt%BNN的纳米复合薄膜的面内和面外热导率值分别是纯PI薄膜的1.31倍和3.35倍。

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