功能化碳化硅纳米线/液晶环氧复合材料的制备与导热性能  

Fabrication and thermally conductive properties of functionalized SiC nanowires/liquid crystal epoxy composites

作　　者：向小莲 马忠雷[2] 石林 韩浪 宋晓宁 邵亮 XIANG Xiaolian;MA Zhonglei;SHI Lin;HAN Lang;SONG Xiaoning;SHAO Liang(Shaanxi Key Laboratory of Chemical Additives for Industry,College of Chemistry and Chemical Engineering,Shaanxi University of Science and Technology,Xi’an 710021,China;Shaanxi Key Laboratory of Polymer Science and Technology,College of Chemistry and Chemical Engineering,Northwestern Polytechnical University,Xi’an 710029,China)

机构地区：[1]陕西科技大学化学与化工学院陕西省轻化工助剂重点实验室,西安710021 [2]西北工业大学化学与化工学院陕西省高分子科学与技术重点实验室,西安710129

出　　处：《复合材料学报》2022年第8期3747-3756,共10页Acta Materiae Compositae Sinica

基　　金：国家自然科学基金(51903145);中央高校基本科研业务费专项资金(D5000210627)。

摘　　要：高导热聚合物基复合材料在电子设备领域具有重要的应用价值。本论文基于“本征-填充”协同作用,以合成的本征型导热液晶环氧树脂为基体,以液晶环氧功能化改性碳化硅纳米线(SiCNWs-LCE)为高导热填料,采用液相共混法制得低填充且高导热SiCNWs-LCE/液晶环氧复合材料。分析了合成液晶环氧树脂的化学结构和结晶行为,以及功能化改性SiCNWs的微观形貌、化学结构和热稳定性等,深入研究了SiCNWs-LCE含量对SiCNWs-LCE/液晶环氧复合材料导热性能和热稳定性的影响规律。结果表明:采用硅烷偶联剂和液晶环氧功能化改性后的SiCNWs具有良好的分散性;“本征-填充”的协同作用使SiCNWs-LCE/液晶环氧复合材料具有良好的导热性能;复合材料的导热性能随着SiCNWs-LCE含量的增加而提高。与纯的液晶环氧树脂相比较,SiCNWs-LCE/液晶环氧复合材料热导率由0.33 W/(m·K)增加至0.72 W/(m·K),提升了118%。Highly thermally-conductive polymer-based composites have important application value in the field of electronic equipment.Based on the“intrinsic-filled”synergistic effect,the liquid crystal epoxy functionalized SiC nanowires(SiCNWs-LCE)/liquid crystal epoxy composites with low filling amount and high thermal conductivity were prepared by the liquid phase blending method,using the synthesized intrinsic thermally-conductive liquid crystal epoxy as matrix and SiCNWs-LCE as highly thermally-conductive fillers.The chemical structures,crystallization behaviors of the liquid crystal epoxy and microstructures,chemical structures and thermal stability of the functionalized SiCNWs were analyzed.The influences of SiCNWs-LCE content on the thermal conductivity and thermal stability of the SiCNWs-LCE/liquid crystal epoxy composites were investigated in detail.The results show that the SiCNWs functionalized by silane coupling agent and liquid crystal epoxy have good dispersibility.The“intrinsicfilled”synergistic effect endows the SiCNWs-LCE/liquid crystal epoxy composite with excellent thermal conductive properties.The thermal conductivity of SiCNWs-LCE/liquid crystal epoxy composites increases with the SiCNWs-LCE content.Compared with the pure liquid crystal epoxy resin,the SiCNWs-LCE/liquid crystal epoxy composites exhibit an increased thermal conductivity from 0.33 W/(m·K)to 0.72 W/(m·K)with an improvement of 118%.

关 键 词：导热复合材料 液晶环氧树脂 功能化SiCNWs “本征-填充” 协同作用 高耐热 

分 类 号：TB332[一般工业技术—材料科学与工程]