Journal
MOLECULES
Volume 26, Issue 14, Pages -Publisher
MDPI
DOI: 10.3390/molecules26144158
Keywords
poly(vinyl alcohol); chemical modification; protic ionic liquid; imidazolium-based ionic liquid
Funding
- Narodowe Centrum Bada 'n (National Science Centre) [2016/23/N/ST5/01919]
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The study elaborated a novel synthesis route of grafting PVA with fluorinated protic ionic liquids bearing sulfo groups, achieving functionalization of PVA with proton character. This approach provides a new perspective for the development of high-performance PEMs.
There has been an ongoing need to develop polymer materials with increased performance as proton exchange membranes (PEMs) for middle- and high-temperature fuel cells. Poly(vinyl alcohol) (PVA) is a highly hydrophilic and chemically stable polymer bearing hydroxyl groups, which can be further altered. Protic ionic liquids (proticILs) have been found to be an effective modifying polymer agent used as a proton carrier providing PEMs' desirable proton conductivity at high temperatures and under anhydrous conditions. In this study, the novel synthesis route of PVA grafted with fluorinated protic ionic liquids bearing sulfo groups (-SO3H) was elaborated. The polymer functionalization with fluorinated proticILs was achieved by the following approaches: (i) the PVA acylation and subsequent reaction with fluorinated sultones and (ii) free-radical polymerization reaction of vinyl acetate derivatives modified with 1-methylimidazole and sultones. These modifications resulted in the PVA being chemically modified with ionic liquids of protic character. The successfully grafted PVA has been characterized using H-1, F-19, and C-13-NMR and FTIR-ATR. The presented synthesis route is a novel approach to PVA functionalization with imidazole-based fluorinated ionic liquids with sulfo groups.
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