期刊
COMPOSITES PART B-ENGINEERING
卷 246, 期 -, 页码 -出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.compositesb.2022.110260
关键词
Transparent wood; Reconfigurable shape memory; Covalent adaptable networks; Solid-state plasticity; Light and thermal management
资金
- Natural Science Foundation of Jiangsu Province [BK20200788]
- Natural Science Research Project Foundation of Colleges and University of Jiangsu Province [20KJB220007]
- Research Start-up Funding of Nanjing Forestry University [163020207]
In this paper, a smart shape-reconfigurable transparent wood (TW) is developed by infiltrating polythiourethane covalent adaptable networks (PTU CANs) into delignified wood (DW) scaffolds. The resulting TW exhibits reconfigurable shape memory behavior, excellent optical properties, low thermal conductivity, and remarkable mechanical strength. It also shows potential applications as a smart actuator for designing fire alarm systems, making it a promising material for high-value utilization.
Transparent wood (TW) is a promising light and thermal management material that has enormous potential for energy-efficient engineering applications. However, almost all the polymers currently used to fabricate TW fall under the thermosetting or thermoplastic category, exhibiting extremely monotonous performance and lack of intelligence. Herein, a smart shape-reconfigurable TW is developed through infiltration the polythiourethane covalent adaptable networks (PTU CANs) into the delignified wood (DW) scaffolds. Benefiting from the solid-state plasticity and thermadapt shape-memory behavior of PTU CANs and the highly aligned cellulose nanofibers of the DW scaffolds, the resulting TW exhibits reconfigurable shape memory behavior, excellent optical properties (transmittance of similar to 90% and tunable light guiding effects), and low thermal conductivity (212.8 mW m(-1)K(-1)). In addition, the tensile strength, modulus, and toughness of TW are 60.14 MPa, 2.09 GPa, and 1.19 MJ m(-3), respectively. Moreover, the reconfigurable shape-memory performance of the TW allows it to be used as a smart actuator for designing a fire alarm system. Compared with traditional TW, the TW reported in this work not only maintains high optical transmittance, but also exhibits excellent reconfigurable shape memory properties, which can promote the high-value utilization for TW. The incorporation of the shape reconfiguration, light guiding, energy saving, and fire alarm actuating properties to the TW opens a new avenue for the design and development of advanced functional and intelligent building materials.
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