Pure Physical‐Crosslinked High‐Strength Thermochromic Hydrogel for Smart Window and Energy Conservation

作者：Weicheng Gao, Luyao Wang, Qianyu Wei, Yaning Wei, Haitao Ma, Lixia Long, Xin Hou, Jin Zhao, Xubo Yuan · 发表于：Advanced Functional Materials · 年份：2024 · DOI：10.1002/adfm.202418941 · 被引用次数：36 · 研究领域：Transition Metal Oxide Nanomaterials、Aerogels and thermal insulation、Solar-Powered Water Purification Methods

Abstract Thermochromic smart windows have attracted widespread attention in the field of solar modulation and building energy conservation. However, current materials of smart windows are still confronted with challenges, including low integrated luminous transmittance ( T lum ), low solar energy modulation (Δ T sol ), weak mechanical properties, and invariable critical transition temperature (τ c ). Herein, hydrophobic polyether side chains, that can reversibly undergo adjustable temperature‐triggered hydrophobic association, are introduced to thermochromic hydrogels for the first time. Due to the reversible phase separation, the obtained hydrogels demonstrate high T lum (92.69%), high Δ T sol (82.15%), widely adjustable τ c and fast transition rate (<4 s). Furthermore, the adjustable τ c of hydrogel is independent of component changes, attributed to the rearrangement of physical‐crosslinked chain segments at various temperatures. Moreover, strong hydrogen bond and high entanglement endow the hydrogel with outstanding mechanical properties (tensile strength >0.45 MPa, elongation >440%). The results of simulation investigations in different cities illustrate that the hydrogels have excellent solar modulation and temperature regulation capabilities. Meanwhile, the thermochromic hydrogel possesses remarkable 3D‐printability and real‐time state monitoring capability, meeting the requirements of different climates and practical application. Therefore, the strategy propos...