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A Phase-Changing Polymer Film for Broadband Smart Window Applications.
Macromolecular Rapid Communications ( IF 4.2 ) Pub Date : 2020-07-21 , DOI: 10.1002/marc.202000290 Yu Xie 1 , Fangyi Guan 1, 2 , Zhou Li 1 , Yuan Meng 1 , Jiang Cheng 3 , Lu Li 3 , Qibing Pei 1
Macromolecular Rapid Communications ( IF 4.2 ) Pub Date : 2020-07-21 , DOI: 10.1002/marc.202000290 Yu Xie 1 , Fangyi Guan 1, 2 , Zhou Li 1 , Yuan Meng 1 , Jiang Cheng 3 , Lu Li 3 , Qibing Pei 1
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Smart windows (SWs) with tunable opacity are sought to regulate solar‐irradiation and privacy protection. A new smart window material based on a phase‐changing polymer that can be reversibly switched between a semicrystalline, opaque state and an amorphous, transparent state is introduced. The polymer film is a network of the phase‐changing poly(stearyl acrylate) crosslinked with a poly(ethylene oxide) oligomer. The two constituent polymers show strong phase separation. The transmission switching of the resulting copolymer film is resulted from the combination of three different mechanisms: reversible phase changing of the poly(stearyl acrylate) component, phase separation between the two distinct constituent polymers, and a large change of refractive index of the phase‐changing polymer during the amorphous‐to‐semicrystalline transition. The opaqueness switching can be reversed and repeated for more than 500 cycles of heating and cooling. A silver nanowire (AgNW)‐based transparent heater is combined with the SW film to control the semicrystalline‐to‐amorphous phase transition. The resulting smart window exhibits a high infrared transmittance modulation (ΔTIR) of 80.4% and solar transmittance modulation (ΔTsolar) of 70.2%, which significantly outperform existing thermochromic smart windows.
中文翻译：
用于宽带智能窗户应用的相变聚合物薄膜。
寻求具有不透明性的智能窗户（SW）来调节太阳辐射和隐私保护。引入了一种新的基于相变聚合物的智能窗户材料，该材料可以在半结晶，不透明状态和非晶，透明状态之间可逆地切换。聚合物膜是与聚环氧乙烷低聚物交联的相变聚丙烯酸丙烯酸硬脂酯的网络。两种组成的聚合物表现出强的相分离。所得共聚物薄膜的透射转换是由三种不同机理的组合引起的：聚（丙烯酸硬脂酯）组分的可逆相变，两种不同组成聚合物之间的相分离以及相的折射率的较大变化在非晶态到半晶态转变期间改变聚合物。不透明度切换可以反转并重复进行超过500个加热和冷却循环。将基于银纳米线（AgNW）的透明加热器与SW膜结合使用，以控制从半晶体到非晶的相变。生成的智能窗口具有很高的红外透射率调制（ΔŤ IR的80.4％）和太阳辐射透射率调制（Δ Ť太阳能的70.2％），其显著优于现有的热致变色智能窗。
更新日期：2020-08-19
中文翻译：
用于宽带智能窗户应用的相变聚合物薄膜。
寻求具有不透明性的智能窗户（SW）来调节太阳辐射和隐私保护。引入了一种新的基于相变聚合物的智能窗户材料，该材料可以在半结晶，不透明状态和非晶，透明状态之间可逆地切换。聚合物膜是与聚环氧乙烷低聚物交联的相变聚丙烯酸丙烯酸硬脂酯的网络。两种组成的聚合物表现出强的相分离。所得共聚物薄膜的透射转换是由三种不同机理的组合引起的：聚（丙烯酸硬脂酯）组分的可逆相变，两种不同组成聚合物之间的相分离以及相的折射率的较大变化在非晶态到半晶态转变期间改变聚合物。不透明度切换可以反转并重复进行超过500个加热和冷却循环。将基于银纳米线（AgNW）的透明加热器与SW膜结合使用，以控制从半晶体到非晶的相变。生成的智能窗口具有很高的红外透射率调制（ΔŤ IR的80.4％）和太阳辐射透射率调制（Δ Ť太阳能的70.2％），其显著优于现有的热致变色智能窗。
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