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Transparent Wood with Thermo-reversible Optical Properties based on Phase-change Material
Composites Science and Technology ( IF 8.3 ) Pub Date : 2020-11-01 , DOI: 10.1016/j.compscitech.2020.108407 Zhe Qiu , Shuo Wang , Yonggui Wang , Jian Li , Zefang Xiao , Haigang Wang , Daxin Liang , Yanjun Xie
Composites Science and Technology ( IF 8.3 ) Pub Date : 2020-11-01 , DOI: 10.1016/j.compscitech.2020.108407 Zhe Qiu , Shuo Wang , Yonggui Wang , Jian Li , Zefang Xiao , Haigang Wang , Daxin Liang , Yanjun Xie
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Abstract Many phase change materials experience a change in optical properties when undergoing a phase transition, showing great potential in preparation of smart optical materials. In this work, copolymer consisted of monomer styrene (St), butyl acrylate (BA), and 1-octadecene (ODE) was infiltrated into treated wood to obtain a flexible transparent wood (TW) with thermo-reversible optical properties (abbreviated as SBO/TW). The introduction of ODE chains induced obvious revisable endothermic decrystallization and exothermic crystallization behaviors, which indicated that SBO/TW had revisable optical characteristic. The novel phase-change SBO5/TW could repeatedly turn from opaque (~23.7% of transmittance, ~98.3% of haze) to transparent (~74.9% of transmittance, ~36% of haze) with an increase in temperature, and vice versa during the cooling process. In addition, the thermal conductivity of SBO/TW was lower than 0.2 W m−1 k−1, which is the limit value of thermal insulation material. Moreover, SBO/TW showed excellent flexibility with a high breaking elongation (~80%) and low storage modulus (good softness). This study presents a synthetic strategy to control optical properties of TW, promoting the potential application of TW as smart light controlling systems.
更新日期：2020-11-01
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