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Fast Switching Water Processable Electrochromic Polymers
journal contribution
posted on 2012-12-26, 00:00 authored by Pengjie Shi, Chad M. Amb, Aubrey
L. Dyer, John R. ReynoldsThis paper describes the synthesis of two new blue to
transmissive
donor–acceptor electrochromic polymers: a polymer synthesized
using an alternating copolymerization route (ECP-Blue-A) and a polymer
synthesized using a random copolymerization (ECP-Blue-R) by Stille
polymerization. These polymers utilize side chains with four ester
groups per donor moiety, allowing organic solubility in the ester
form, and water solubility upon saponification to their carboxylate
salt form. We demonstrate that the saponified polymer salts of ECP-Blue-A
and ECP-Blue-R (WS-ECP-Blue-A and WS-ECP-Blue-R) can be processed
from aqueous solutions into thin films by spray-casting. Upon the
subsequent neutralization of the thin films, the resulting polymer
acid films are solvent resistant and can be electrochemically switched
between their colored state and a transmissive state in a KNO3/water electrolyte solution. The polymer acids, WS-ECP-Blue-A-acid
and WS-ECP-Blue-R-acid, show electrochromic contrast Δ%T of 38% at 655 nm and 39% at 555 nm for a 0.5 s switch,
demonstrating the advantage of an aqueous compatible electrochrome
switchable in high ionic conductivity aqueous electrolytes. The results
of the electrochromic properties study indicate that these polymers
are promising candidates for aqueous processable and aqueous switching
electrochromic materials and devices as desired for applications where
environmental impact is of importance.
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polymer acidselectrochromic materialscarboxylate salt formStille polymerizationKNOester groupscopolymerization routedonor moietyelectrochrome switchableester formwater solubilitypolymer acid filmselectrochromic properties studyFast Switching Water Processable Electrochromic PolymersThis paper555 nm655 nmsaponified polymer saltsside chainstransmissive state
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