Due to the rapid development of multifunctional and miniaturized electronic devices, the demand for polymer composites with mechanical properties, highthermal conductivity, and dielectric properties is increasing. Therefore, the heat dissipation capacity of the composite must be improved. To solve this problem, we report a glass fabric (GF)/boron nitride (BN) network with a highly thermally conductive hetero-structured formed using polyvinyl alcohol (PVA) as an adhesive. The GF and BN are furtherly modified by (3-aminopropyl)triethoxysilane (APTES) for better thermal conductivity enhancement. When the BN content is 30%, the thermal diffusion coefficient and thermal conductivity of obtained PVA-mBN@mGF (PBG) are 2.843 mm 2 /s and 1.394 W/(m K), respectively. Epoxy (EP) resin is then introduced to prepare PBG/mBN/EP laminated composites via the hot pressing method as applied as thermal conductive composites. A highest thermal conductivity of 0.67 W/(m K) of PBG/mBN/EP laminated composites is obtained, three times higher than that of pure EP. In addition, the PBG/mBN/EP laminated composites also present favorable mechanical, electrically insulating, and dielectric properties.
A multiple injection compression molding (ICM) method was proposed on the basis of injection molding and applied for the preparation of polypropylene/ short carbon fiber (PP/SCF) high thermally conductive composites in this article. During each injection compression cycle, the thickness of composite sample would be reduced effectively for better SCF orientation along the flow direction. Moreover, the original loose self-assembled SCF networks obtained from injection process can furtherly transfer into much compact ones under the effect of compression force. The performance differences among SCF/PP composites prepared with one-time injection molding (IM), multiple IM, and multiple ICM were also investigated. The SCF/PP composite sample prepared with multiple ICM method presented superior comprehensive performance, $100% and 28% enhancements in thermal conductivity and tensile strength compared with the one-time IM sample. We believe the multiple ICM method can provide a new idea for industrial production of functional polymer composites, especially for thermoplastic polymer composite.
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