Rui-Han Zhang#, Xue-Tao Shi#, Lin Tang, Zheng Liu, Jun-Liang Zhang, Yong-Qiang Guo and Jun-Wei Gu*. Thermally Conductive and Insulating Epoxy Composites by Synchronously Incorporating Si-sol Functionalized Glass Fibers and Boron Nitride Fillers. Chinese Journal of Polymer Science, 2020, 38: 730-739. 2018IF=2.804.（中国科技期刊卓越行动计划入选项目-梯队期刊类）.
https://doi.org/10.1007/s10118-020-2391-0
Abstrac: tGlass fibers (GFs)/epoxy laminated composites always present weak interlaminar shear strength (ILSS) and low cross-plane thermal conductivity coefficient (λ⊥). In this work, silica-sol, synthesized from tetraethyl orthosilicate (TEOS) and KH-560 via sol-gel method, was employed to functionalize the surface of GFs (Si-GFs). Together with a spherical boron nitride (BNN-30), the thermally conductive BNN-30/Si-GFs/epoxy laminated composites were then fabricated. Results demonstrate that Si-sol is beneficial to the improvement of mechanical properties for epoxy laminated composites (especially for ILSS). The BNN-30/Si-GFs/epoxy laminated composites with 15 wt% BNN-30 fillers display the optimal comprehensive properties. In-plane λ(λ//) and λ⊥ reach the maximum of 2.37 and 1.07 W·m?1·K?1, 146.9% and 132.6% higher than those of Si-GFs/epoxy laminated composites (λ// = 0.96 W·m?1·K?1 and λ⊥ = 0.46 W·m?1·K?1), respectively, and also about 10.8 and 4.9 times those of pure epoxy resin (λ// = λ⊥ 0.22 W·m?1·K?1). And the heat-resistance index (THRI), dielectric constant (ε), dielectric loss (tanδ), breakdown strength (E0), surface resistivity (ρs) as well as volume resistivity (ρv) are 197.3 °C, 4.95, 0.0046, 22.3 kV·mm?1, 1.8 × 1014 Ω, and 2.1 × 1014 Ω·cm, respectively.
玻璃纤维（GFs）/环氧树脂层压复合材料通常存在层间剪切强度（ILSS）差和面间热导率（λ⊥）低等缺点。基于此，本文以正硅酸乙酯（TEOS）和γ-缩水甘油醚氧丙基三甲氧基硅烷（KH-560）合成的硅溶胶（Si-sol）改性的玻璃纤维布（Si-GFs）为增强体，球形氮化硼（BNN-30）为导热填料，环氧树脂为基体，采用“涂覆-铺层-模压”工艺分别制备Si-GFs/环氧树脂层压复合材料和BNN-30/Si-GFs/环氧树脂层压导热复合材料。结果表明，Si-sol的引入有助于提升Si-GFs/环氧树脂层压复合材料的力学性能（尤其是ILSS）。当BNN-30用量为15 wt%时，BNN-30/Si-GFs/环氧树脂层压导热复合材料具有最优的综合性能。面内热导率（λ//）和λ⊥分别为2.37 W m-1K-1和1.07 W m-1K-1，较Si-GFs/环氧树脂层压复合材料的λ//（0.96 W m-1K-1）和λ⊥（0.46 W m-1K-1）分别提升146.9%和132.6%，同时约为纯环氧树脂λ（λ//=λ⊥，0.22 W m-1K-1）的10.8倍和4.9倍。此时，BNN-30/Si-GFs/环氧树脂层压导热复合材料的耐热指数（THRI）、介电常数（ε）、介电损耗（tanδ）、特征击穿强度（E0）、表面电阻率（ρs）和体积电阻率（ρv）分别为197.3oC、4.95、0.0046、22.3 kV mm-1、1.8×1014 Ω和2.1×1014 Ω·cm。
附第一作者（张睿涵）个人简介
张睿涵，女，陕西西安人，2018级硕士研究生。2018年于广西大学获学士学位，同年保送至西北工业大学顾军渭教授SFPC课题组攻读硕士学位。主要从事增强纤维的表面改性、填充型高导热环氧树脂及其复合材料的性能调控和内禀机制研究。以第一作者在Chinese Journal of Polymer Science上发表学术论文1篇。参与国家自然科学基金、陕西省自然科学基础计划杰出青年基金项目各1项；参加国内会议1次；授权、公开国家发明专利1件。