Journal
POLYMER
Volume 204, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.polymer.2020.122803
Keywords
Deep eutectics; Ion conductive polymers; Radical polymerization
Categories
Funding
- A-STEP (Adaptable and Seamless Technology Transfer Program through targetdriven RD, JST, Japan) [JPMJTM19A4]
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We describe the synthesis of three novel deep eutectic monomers (DEMs) by reacting cationic monomers bearing quaternary ammonium groups with urea. These DEMs can be used for the synthesis of ion-conductive polymers by radical polymerization. The reaction of methacroylcholine chloride (MC-Cl) with urea in a 1:2 M ratio at 80 degrees C for 1 h afforded the methacrylate-type DEM, MC-Cl-2Urea, as a transparent viscous liquid. Similarly, an acrylateand a diallyl-type DEMs, ATMA-Cl-1Urea and DADMA-Cl-2Urea, were obtained through simple mixing of the quaternary-ammonium-containing monomers, 2-(acryloyloxy)ethyl trimethyl ammonium chloride (ATMA-Cl) and diallyl-dimethyl ammonium chloride (DADMA-Cl), respectively, with urea. Free radical polymerization of the DEMs afforded the corresponding polymers, which were characterized using NMR, viscosity, DSC, and TGA measurements. Among the three poly(DEM)s, the diallyl-type poly(DADMA-Cl-2Urea) exhibited the highest ionic conductivity of 5.3 x 10(-3) S cm(-1) at 25 degrees C under ambient humidity condition (relative humidity = 30-50%). The polymeric products obtained from liquid DADMA-Cl-2Urea via in situ polymerization without using any volatile organic solvent exhibited an ionic conductivity of 1.6 x 10(-6) and 7.5 x 10(-5) S cm(-1) at 25 and 50 degrees C under anhydrous condition.
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