Thermo-Responsive Poly(N-isopropylacrylamide)/Hydroxypropylmethyl Cellulose Hydrogel with High Luminous Transmittance and Solar Modulation for Smart Windows,ACS Applied Materials & Interfaces

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Thermo-Responsive Poly(N-isopropylacrylamide)/Hydroxypropylmethyl Cellulose Hydrogel with High Luminous Transmittance and Solar Modulation for Smart Windows
ACS Applied Materials & Interfaces ( IF 8.3 ) Pub Date : 2023-01-11 , DOI: 10.1021/acsami.2c15367
Kai Wang _{1,

2} , Guoqi Chen ₃ , Sen Weng ₂ , Linxi Hou _{1,

2} , Dezhan Ye ₄ , Xiancai Jiang _{1,

2}

Affiliation

Thermochromic smart windows are considered to be promising energy-saving devices for reducing energy consumption in buildings. The ideal materials for thermochromic smart windows should have high transmittance, high solar modulation, low phase-transition temperature, and excellent high-temperature thermal stability, which are difficult to achieve simultaneously. This work reports a simple one-step low-temperature polymerization method to prepare a thermo-responsive poly(N-isopropylacrylamide)/hydroxypropylmethyl cellulose (PNIPAM/HPMC) hydrogel achieving the above performances simultaneously. The low-temperature polymerization environment endowed the hydrogel with a high luminous transmittance (T_lum) of 90.82%. HPMC as a functional material effectively enhanced the mechanical properties and thermal stability of the hydrogel. Meanwhile, the PNIPAM/HPMC hydrogel showed a low phase-transition temperature (∼32 °C) and high solar modulation (ΔT_sol = 81.52%), which proved that it is an ideal material for thermochromic smart windows. Moreover, a PNIPAM/HPMC smart window exhibited high light transmittance (T_380–760 = 86.27%), excellent light modulation (ΔT₃₆₅ = 74.27%, ΔT_380–760 = 86.17%, and ΔT₉₄₀ = 63.93%), good indoor temperature regulation ability and stability, which indicated that it was an attractive candidate for application in reducing energy consumption in buildings. This work also provides an option and direction for modifying PNIPAM-based thermochromic smart windows.

中文翻译：

用于智能窗的具有高透光率和太阳能调制的热响应聚（N-异丙基丙烯酰胺）/羟丙基甲基纤维素水凝胶

热致变色智能窗被认为是有前途的节能设备，可降低建筑物的能耗。理想的热致变色智能窗材料应具有高透光率、高太阳能调制、低相变温度和优异的高温热稳定性，这些是很难同时实现的。这项工作报告了一种简单的一步低温聚合方法来制备同时实现上述性能的热响应性聚（ N-异丙基丙烯酰胺）/羟丙基甲基纤维素（PNIPAM/HPMC）水凝胶。低温聚合环境赋予水凝胶高透光率（T _lum) 的 90.82%。HPMC作为功能材料有效地提高了水凝胶的力学性能和热稳定性。同时，PNIPAM/HPMC 水凝胶表现出低相变温度（~32 °C）和高太阳能调制（ΔT _sol = 81.52%），证明它是热致变色智能窗的理想材料。此外，PNIPAM/HPMC 智能窗表现出高透光率（T _380–760 = 86.27%）、出色的光调制（ΔT ₃₆₅ = 74.27%、ΔT _380–760 = 86.17% 和ΔT ₉₄₀= 63.93%)，具有良好的室内温度调节能力和稳定性，表明其在降低建筑能耗方面的应用具有吸引力。这项工作还为修改基于 PNIPAM 的热致变色智能窗提供了一个选项和方向。

更新日期：2023-01-11

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