Preparation And Characterization Of Transmittance Phase Change Energy Storage Wood

Transmittance wood is a new type of green ecological material,which has potential application value in intelligent building,magnetic equipment,photoelectric devices and other fields.Phase change heat storage material is a new generation of green and energy saving materials,which can realize energy saving and temperature regulation independently through the change of phase.It is of great significance for the development of new green and energy saving biomass materials to give wood the efficient response and storage function of light and heat by combining transmittance wood with phase change heat storage material.In this study,Balsa wood was used as the substrate,capric acid and polyethylene glycol were used as phase change heat storage materials,and epoxy resin was used as the shaping and encapsulating material.Through delignination pretreatment,melt blending and vacuum impregnation,the transmittance phase change energy storage wood with both optical and heat storage properties was prepared.The effects of the content of phase change heat storage materials and the coupling of ternary interface on the photothermal properties of transmittance phase change energy storage wood were studied.It provided technical and theoretical support for the creation of new biologically based green building materials and the construction of ecological rooms.The main conclusions are as follows:(1)Epoxy resin-based capric acid and polyethylene glycol formative phase change heat storage materials with different proportions were prepared by melt blending method.The phase change heat storage material is combined with epoxy resin through crosslinking network structure and hydrogen bond,and the composite material has good shaping and encapsulation ability and heat storage and release performance.The capric acid is 70 wt%,the latent heat of melting and crystallization are 125.5and 125.2 J/g,and the corresponding phase transition peak temperatures are 30.84 and 26.70 ?;the polyethylene glycol is 80 wt%,the latent heat of melting and crystallization are 163.3 and 159.9 J/g,and the phase transition peak temperatures are 30.66 and 21.73 ?.(2)Transmittance phase change energy storage wood was prepared by pretreatment of wood delignification and vacuum impregnation of phase change heat storage material.Polymer-based shaped phase change heat storage material and delignified wood template are combined by three-dimensional porous physical chimerism and chemical crosslinking.The transmittance phase change energy storage wood has good optical properties and heat storage and release performance,and the temperature range of environmental thermal response conforms to the comfortable temperature range of human body.The capric acid is 70 wt%,the light transmittance is 73.11%,the latent heat of melting and crystallization are98.92 and 97.20 J/g,and the peak temperatures of transformation are 32.07 and 25.20 ?;the polyethylene glycol is 80 wt%,the light transmittance reaches 80.58%,the latent heat of melting and crystallization are 134.1 and 122.9 J/g,and the peak temperatures of phase transition are 30.66 and22.19 ?.(3)The ternary composite interface of phase change heat storage material-epoxy resin-wood in transmittance phase change energy storage wood has good compatibility.Light and heat depend on the molecular chain vibration of polymer matrix,lattice phonons and photons in the form of interaction.By adjusting the structure of "polymer shaping package-ternary interface coupling-photothermal transmission link",the light transmittance,heat storage and release efficiency,leakage prevention and cycle stability of the composite can be cooperatively improved.