Synthesis of Polyphosphazenes with Sulfonimide Side Groups

Sulfonated hydrocarbon membranes for medium-temperature and low-humidity proton exchange membrane fuel cells (PEMFCs)

“…In this review, both methods will be discussed and progress in PEM materials development will be detailed. In addition to sulfonic acid groups, other acid functional groups such as phophophonic acid [29][30][31] and sulfonamide [32,33] have been used to impart hydrophilicity in polymers. Nafion ® , manufactured by DuPont TM (see Fig.…”

Synthesis of Polyphosphazene with Pendent Perfluorobutylsulfonylimide Group

“…16,17 In the synthesis of PDPA-perfluorobutylsulfonylimide a modification method was used and the synthetic route of the polymer is illustrated in Scheme 1. The structure of the polymer was confirmed by IR, 1 H NMR and 19 F NMR spectrometry methods.…”

“…9,11,12 Because of the high acid strength of sulfonimide acids, 13 the materials containing sulfonimide groups have become attractive alternatives to sulfonic acid containing materials. [14][15][16] Hofmann and co-workers 17 have reported the synthesis of polyphosphazenes with trifluoromethylsulfonylimide side group by using NaOC 6 H 4 NNaSO 2 CF 3 . Quite recently, we prepared polystyrenes with pendent perfluoroalkylsulfonylimide groups and found that the polymer with perfluorobutylsulfonylimide group had higher acid strength than that with trifluoromethylsulfonylimide, 13,18 and also the polystyrenes with pendent perfluoroalkylsulfonylimide groups were very good reusable catalysts for direct condensation of carboxylic acids and alcohols.…”

Components for PEM Fuel Cells: An Overview

“…Poly aryloxyphosphazenes) having sulfonimide units are also known [72]. Blending and radiation cross linking have been investigated as means to reduce water swelling and methanol permeation of poly (aryloxyphosphazene) ionomers [73].…”