A Phase-Changing Polymer Film for Broadband Smart Window Applications.

Macromolecular Rapid Communications
Yu XieQibing Pei

Abstract

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%, whi...Continue Reading

References

Sep 23, 2014·Scientific Reports·Linshuang Long, Hong Ye
Jun 11, 2015·ACS Applied Materials & Interfaces·Junpeng LiQibing Pei
Jan 6, 2016·Langmuir : the ACS Journal of Surfaces and Colloids·Ning WangYi Long
Aug 25, 2017·ACS Applied Materials & Interfaces·Thanh-Giang LaHyun-Joong Chung
Aug 24, 2018·ACS Applied Materials & Interfaces·Zhenguang WangJianzhong Xu

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