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[Chinese Journal of Polymer Science]Thermally Conductive and Insulating Epoxy Composites by Synchronously Incorporating Si-sol Functionalized Glass Fibers and Boron Nitride Fillers
作者:Rui-Han Zhang#, Xue-Tao Shi#, Lin Tang, Zheng Liu, Jun-Liang Zhang, Yong-Qiang Guo and Jun-Wei Gu*
关键字:Thermally Conductive, Insulating, Glass Fibers
论文来源:期刊
具体来源:Chinese Journal of Polymer Science
发表时间:2020年
Glass 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.