A scalable and efficient strategy for preparing flexible transparent energy storage wood film

Under the current background of technological development, the new generation of building materials wood film should possess multi-functional characteristics. This research impregnated densified wood templates with dodecanol/epoxy resin to prepare high-strength, hydrophobic and phase-change energy storage transparent flexible wood films (TW/DO-TEMPO). The densified wood template was made from delignified wood treated with TEMPO mediated oxidation and directional shear extrusion, which improved the optical properties and flexibility of the specimen by reducing the pores of the wood cell wall and cell cavity. The above provides an excellent structural carrier for the preparation of wood-based films. The phase transformation enthalpy value and tensile strength of this wood film can be as high as 90.16 J/g and 145.19 MPa respectively. According to different temperatures, the transmittance of the sample can be reversibly switched within the range of 61.31%–93%, which is attributed to the phase-change material dodecanol encapsulated within the sample. It is worth noting that a greenhouse model has been constructed here, and the application of wood film can effectively delay the temperature rise and store energy. The above indicates that TW/DO-TEMPO has the potential to replace traditional materials and be applied to energy-saving building windows, anti-counterfeiting or home decorative materials, which is of crucial significance for promoting the design of green materials.