Fluorinated, crosslinkable terpolymers based on vinylidene fluoride and bearing sulfonic acid side groups for fuel-cell membranes

摘要: The radical terpolymerization of 8-bromo-1H,1H,2H-perfluorooct-1-ene with vinylidene fluoride (VDF) and perfluoro(4-methyl-3,6-dioxaoct-7-ene) sulfonyl is presented. Changing the feed compositions these three fluorinated comonomers enabled us to obtain different random-type poly[vinylidene fluoride-ter-perfluoro(4-methyl-3,6-dioxaoct-7-ene) fluoride-ter-8-bromo-1H,1H,2H-perfluorooct-1-ene] terpolymers containing various brominated side groups. Yields higher than 70% were reached in all cases. hydrolysis group into SO3Li function presence lithium carbonate was quantitatively achieved without content VDF being affected, so dehydrofluorination base unit avoided. These original then crosslinked via dangling bromine atoms a peroxide/triallyl isocyanurate system, which produced films insoluble organic solvents such as acetone dimethylformamide (which totally dissolved uncured terpolymers). acidification SO3H protonic membranes be obtained. thermal stabilities materials those terpolymers, their electrochemical performances investigated. According contents sulfonic acid functions, ion-exchange capacities ranged from 0.6 1.5 mequiv H+/g, whereas water uptake conductivities 5–26% (±11%) 0.5 6.0 mS/cm, respectively. © 2006 Wiley Periodicals, Inc. J Polym Sci Part A: Chem 44: 4566–4578,