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Green and Blue Electrochromic Polymers from Processable Siloxane Precursors
journal contribution
posted on 2013-07-23, 00:00 authored by Ki-Ryong Lee, Gregory A. SotzingHerein
we report the synthesis of a new class of processable siloxane precursor
polymers consisting of aromatic groups and flexible siloxane linkages
and their conversions to green and blue electrochromic polymers in
the solid state. 3,4-Ethylenedioxythiophene (EDOT), 2,2′-bis(3,4-ethylenedioxythiophene)
(BiEDOT), and a donor–acceptor moiety 4,7-bis(EDOT)-2,1,3-benzothiadiazole
(BEBTD) were incorporated as aromatic groups to demonstrate the versatility
of the precursor method to different aromatic systems. The utilization
of a siloxane linkage allows for a precursor polymer exhibiting improved
solubility in common organic solvents and accessible glass transition
temperatures (−1 to 132 °C) as compared to a previously
reported silane precursor. A simple method to control the thermal
properties of the precursor was also demonstrated by incorporation
of both siloxane and silane functionalities into the precursor backbone.
The oxidatively converted product from the precursors showed electronic
and optoelectronic properties comparable to the conjugated polymer
prepared by conventional electrochemical polymerization of monomers
in an electrolyte bath. In addition to the dark-blue to sky-blue electrochromic
PEDOT from EDOT and BiEDOT, a dual-band absorbing green to sky-blue
electrochromic polymer was demonstrated using BEBTD. This demonstrates
that the precursor approach is easily applicable and feasible for
the preparation of conjugated polymers from numerable electrochemically
polymerizable aromatic groups.
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Processable Siloxane PrecursorsHereinelectrochemical polymerizationprocessable siloxane precursor polymersoptoelectronic propertiessiloxane linkageprecursor approachBlue Electrochromic Polymerselectrochromic polymersPEDOTelectrolyte bathnumerable electrochemically polymerizablesiloxane linkagessilane functionalitiesprecursor backboneprecursor methodsilane precursorEDOTBEBTDprecursor polymer
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