Functionalized glass fibers cloth/spherical BN fillers/epoxy laminated composites with excellent thermal conductivities and electrical insulation properties

By Lin Tang, Mukun He, Xin Na, Xiaofang Guan, Ruihan Zhang, Junliang Zhang, Junwei Gu. 2019

172 citations recorded by the source corpus.

Abstract Thermally conductive glass fibers cloth/spherical boron nitride fillers/epoxy (GFs/BN/epoxy) laminated composites with excellent electrical insulation properties were fabricated by blending-impregnation followed by hot compression method. Epichlorohydrin (ECH) was successfully grafted onto the surface of GFs (f-GFs), in favor of improving the mechanical properties of the f-GFs/epoxy laminated composites. For a given spherical BN fillers loading, GBN-100 with relatively larger particle size was more benefit for enhancing the thermal conductivities of the BN/epoxy composites. Meantime, thermal conductivity coefficient (λ) values of the f-GFs/GBN-100/epoxy laminated composites were gradually enhanced with the increasing addition of GBN-100 fillers. When the mass fraction of GBN-100 fillers was 20 wt%, the λ in vertical (λ⊥) and parallel (λ∥) of the f-GFs/GBN-100/epoxy laminated composites was the maximum of 1.21 and 3.55 W m−1K−1, about 3 and 6 times than that of the f-GFs/epoxy laminated composites (λ⊥ of 0.41 W m−1K−1 and λ∥ of 0.66 W m−1K−1), respectively, and much higher than that of pure epoxy matrix (0.23 W m−1K−1). Meantime, the surface resistivity and breakdown strength of the f-GFs/GBN-100/epoxy laminated composites with 20 wt% GBN-100 fillers was respectively decreased to 5.1*1014 Ω and 7 KV mm−1, but still maintained excellent electrical insulation properties.

Subfields: Materials Chemistry, Mechanical Engineering

View Paper: https://www.semanticscholar.org/paper/55a176cbef1441754c0e78e45eb89d69719dc259