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Temperature-responsive hydroxypropylcellulose based thermochromic material and its smart window application

机译：温度响应羟丙基纤维素的热致变色材料及其智能窗口应用

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Thermochromic materials are the most cost effective smart window materials and the organic hydrogel material has large solar modulating ability (Δ T _(sol) ) and the luminous transmittance ( T _(lum) ) compared with inorganic VO _(2) based materials. Here we report a green and new organic thermochromic material based on hydroxypropylcellulose. With increasing addition of NaCl from 0.5% (wt%) to 5% (wt%), the LCST (lower critical solution temperature) could reduce from 42 °C to 30 °C. The morphology change of freeze dried samples below and above LCST proves that the phase change of this hydroxypropylcellulose based hydrogel is due to the solubility change of the polymer in water. The fine-tuned recipe can give an outstanding solar modulating ability (Δ T _(sol) ) of 25.7% and high averaged T _(lum) of 67.4% with LCST of 38 °C.
机译：热致变色材料是最具成本效益的智能窗材料，有机水凝胶材料具有大的太阳能调节能力（ΔT_（溶胶））和与无机VO _（2）基材料相比的发光透射率（T _（LUM））。在这里，我们报告了基于羟丙基纤维素的绿色和新的有机热致变色材料。随着NaCl的增加从0.5％（wt％）至5％（wt％），LCST（低临界溶液温度）可以将42℃降低至30℃。低于LCST的冷冻干燥样品的形态变化证明，该羟丙基纤维素基水凝胶的相变是由于水中聚合物的溶解度变化。微调配方可以提供25.7％和高平均T _（LUM）的出色的太阳调节能力（ΔT_（溶胶），LCST为38°C。

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