재활용 가능한 고방열 고분자 복합소재의 개발

Abstract

Polymers have been widely adapted as matrix incorporating relatively heavy but functional fillers to produce more practically useful materials with lighter weights in composite industries. To address tremendous needs for developing efficiently heat dissipating material with lightweights, a new class of polymer poly(hexahydrotriazine) (PHT) possessing recyclable and malleable characteristics was synthesized for incorporating model functional hexagonal boron nitride (h-BN) filler. A unique mechanical property (such as plasticity) of the PHT at elevated temperatures was confirmed by dynamic mechanical analysis (DMA). The final composite with highly aligned filler was prepared via simple hot pressing, as a result of a good interfacial interaction between the matrix and the filler along with shear force generated upon manufacturing the composite. the composite exhibited a high thermal conductivity of 13.8 W/mK. By chemically depolymerizing the matrix, the h-BN could be recovered from the composite without physical/chemical denaturation of the filler. Quality of the h-BN was evaluated by performing raman spectroscopy and X-ray photoelectron spectroscopy (XPS), indicating the recovered filler can be used again for the future in various composite fields.