Thermal Conductivity of Poplar Wood Veneer Impregnated with Graphene/Polyvinyl Alcohol

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.

Preparation and Performance of Thermochromic and Self-Repairing Dual Function Paint Film with Lac Resin Microcapsules and Fluorane Microcapsules

“…The self-repair mechanism of lac resin microcapsules is such that when the lac microcapsules are destroyed, the core of the lac coatings flows out, and the ethanol solvent in the lac coating volatilizes physically, which can repair cracks to a certain extent after curing. The thermochromic mechanism of fluorane microcapsules is such that the central carbon atom and surrounding atoms of fluorane combine with each other through the SP 3 hybrid orbital to obtain a colorless lactone structure. The lactone ring opens and develops color at low temperatures, and the lactone ring closes and does not develop color at high temperatures.…”

“…Fluorane thermosensitive dyes were colorless or had only a slight color (proton acceptor), and the central carbon atom and surrounding atoms were bonded to each other through the sp 3 hybridization orbit to obtain a colorless lactone structure. When the dye came into contact with the chromogenic reagent (proton donor), the lactone ring was opened, the sp 3 hybrid orbit of the central carbon atom was transformed into an sp 2 hybrid orbit, and the dye molecule formed a planar conjugated system, which increased the electronic overlapping efficiency and reduced the molecular excitation energy, so that its maximum absorbance shifted to the visible light region, that is, color developed. The lactone ring of these compounds was open at low temperatures and could stay open at low temperatures under the action of a solvent, while the lactone ring was closed and reacted at high temperatures.…”

“…As a natural polymer composite material, wood material has a unique vein, color, and texture and is the main material for furniture [1][2][3]. Coatings on the furniture surface can effectively improve the dry shrinkage and wet swelling of wood and play a further role in aesthetics and protection [4][5][6][7].…”

Preparation of Silver Antibacterial Agents with Different Forms and Their Effects on the Properties of Water-Based Primer on Tilia europaea Surface

“…This leads to the problem that wooden furniture is prone to mildew and decay. Therefore, it is necessary to carry out antibacterial treatment and protection on the surface of wood products, to prevent the microbial biodegradation of wood and achieve the antibacterial effect [4,5]. The solvent of the water-based coating is water and low-molecular alcohol, which does not contain organic volatiles, and has excellent properties such as environmental protection and safety [6,7].…”

Effect of Shellac Waterborne Coating Microcapsules on the Optical, Mechanical and Self-Healing Properties of Waterborne Primer on Tilia europaea L. Wood

“…It can be used to make wood thread, blockboard, wooden crafts and other decorative materials [27,28]. Therefore, Tilia europaea L. was selected as the wood substrate for the experiment [29]. Insitu polymerization is one of the most commonly used methods to prepare microcapsules.…”