Novel anion-exchange organic-inorganic hybrid membranes: Preparation and characterizations for potential use in fuel cells

A new series of supported anion-exchange organic-inorganic hybrid membranes were prepared by quaternizing the copolymer of vinylbenzyl chloride (VBC) and gamma-methacryloxypropyl trimethoxy silane (gamma-MPS) and then applying a sol-gel reaction to the copolymer and monophenyltriethoxysilane (EPh). The membranes were characterized for potential use in fuel cells. The results show that the physicochemical properties, including ion-exchange property, hydrophilicity, and thermal/chemical stability, can be easily controlled by adjusting the quaternization extent of the copolymer and the dosage of EPh. The hybrid membranes have relatively strong alkali resistance, high temperature tolerance (thermal degradation temperature in air, Td, in the range of 250-300 degrees C), high tensile strength (TS) and elongation at break (E-b). The hydroxyl ion conductivity is in the range of 2.27-4.33 X 10(-4) S/cm. (c) 2008 Elsevier B.V. All rights reserved.