China Plastics ›› 2018, Vol. 32 ›› Issue (09): 78-84.DOI: 10.19491/j.issn.1001-9278.2018.09.013

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Study on Preparation and Performance of Thermal Conductive Graphene Oxide/ Polybenzoxazine Composites

  

  • Received:2018-04-11 Revised:2018-05-27 Online:2018-09-26 Published:2018-10-25

Abstract: Silane-functional benzoxazines (B-TES) were synthesized by a Mannich condensation method using aminopropyltriethoxysilane, bisphenol.A and paraformaldehyde as precursors. The resulting B-TES was introduced into the composite system containing the graphene oxide (GO) and bisphenol-A-aniline-based monomeric benzoxazine (BA-a), and then the thermal curing process of this composite system was investigated by Fourier-transform infrared spectroscopy, differential scanning calorimetry and rheological analysis. The thermal conductivity of poly(BA-a/B-TES)/GO composites were measured with a “laser flash” technique. The results indicated that the thermal conductivity increased from 0.29 W/(m·K) to 0.56 W/(m·K) when the content of GO/B-TES increased from 1 wt % to 6 wt %. The thermal boundary resistance (Rb) between the GO and poly(BA-a) matrix was theoretically predicted according to the Maxwell-Garnett effective medium approximation, and the calculated Rb decreased from 150×10-9 m2· K/W to 130×10-9 m2· K/W due to the bridge connection of the B-TES. In addition, the poly(BA-a/B-TES)/GO composites also exhibited a high thermal stability and low surface energy.