Abstract
Intending to achieve more green and economical graphene impregnated modified fast-growing poplar wood veneer for heat conduction, this study proposes and investigates the feasibility of modified veneer with graphene/Polyvinyl alcohol (Gr/PVA) impregnation mixture to improve its thermal conductivity. The absorbance and viscosity of the Gr/PVA impregnation mixtures are observed to expound the Gr/PVA ratio effects on the mixtures. Simultaneously, the weight percent gain, chromatic aberration, and thermal conductivity of the modified veneers are measured to determine the impregnation effect and the optimal impregnation formula. Further, the chemical structure, crystallinity, and thermal stability of the optimal sample impregnated with Gr/PVA are tested. The results show that the thermal properties of the Gr/PVA impregnated modified veneer have not all been improved. Still, both the dispersibility of the impregnation mixtures and the impregnation effect is affected by the Gr/PVA ratio. The data shows that the optimal thermal conductivity of modified veneer, which is up to 0.22 W·m−1·K−1 and 2.4 times the untreated one, is dipped by the mixture of 10 wt.% PVA concentration and 2 wt.% MGEIN addition. According to the characterization tests, the crystallinity of the modified veneer reduces, but the thermal stability improves.
Highlights
IntroductionWood is a poor thermal conductor, mostly having its thermal conductivity less than 0.12 W·m−1 ·K−1 [1]
From the perspective of economy and environmental protection, a type of woodbased composite for heat conduction was prepared by being impregnated with graphene/Polyvinyl alcohol (Gr/Polyvinyl alcohol (PVA))
That proves that the thermal stability of GP–MW has been improved, indicating that MGEIN has played an important role
Summary
Wood is a poor thermal conductor, mostly having its thermal conductivity less than 0.12 W·m−1 ·K−1 [1]. Wood composites have better thermal conductivity; they are more suitable for heating floors. The wood composites commonly used for flooring include plywood, particleboard, high-density fiberboard, and thick veneers [5], whose thermal conductivities range from 0.12 to 0.17 W·m−1 ·K−1 [6]. Seo et al [7] found that it was effective to increase the thermal conductivity of the wood flooring by using exfoliated graphite nanoplatelets (xGnP) or resin/xGnP composites as adhesive. Chen et al [8] studied the thermal properties of four engineered wood floors with the same structure but different decorative veneers, revealing that the higher the density, the better the thermal conductivity. There were numerous studies on heat transfer with the
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