A Phase-Changing Polymer Film for Broadband Smart Window Applications.
optical phase change materials
polymer
smart window
solar radiation
Journal
Macromolecular rapid communications
ISSN: 1521-3927
Titre abrégé: Macromol Rapid Commun
Pays: Germany
ID NLM: 9888239
Informations de publication
Date de publication:
Aug 2020
Aug 2020
Historique:
received:
27
05
2020
pubmed:
22
7
2020
medline:
22
6
2021
entrez:
22
7
2020
Statut:
ppublish
Résumé
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 (ΔT
Identifiants
pubmed: 32691931
doi: 10.1002/marc.202000290
doi:
Substances chimiques
Polymers
0
Types de publication
Journal Article
Langues
eng
Sous-ensembles de citation
IM
Pagination
e2000290Subventions
Organisme : NIH HHS
ID : 1S10RR23057
Pays : United States
Informations de copyright
© 2020 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.
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