Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
638064 | Journal of Membrane Science | 2008 | 10 Pages |
Abstract
Novel proton-conductive inorganic-organic hybrid membranes were synthesized from styryl-substituted alkoxysilanes containing different numbers of methoxy groups and phenylvinylphosphonic acid (PhVPA) through the use of radical copolymerization followed by sol-gel process. The substituted alkoxysilanes were copolymerized with phenylvinylphosphonic acid yielding copolymers that were chemically bound with phosphonic acid groups. The mechanical properties and flexibility of these membranes reflected the type of Si-O-Si linkages, which were controlled through the number of alkoxy groups on the Si atoms in the starting organosiloxane compounds. The proton conductivity of the hybrid membranes increased with increasing phosphonic acid content and with decreasing inorganic Si-O cross-linking. The membrane from difunctional methyl (dimethoxy)silylmethylstyrene/PhVPA = 1/4 exhibited a conductivity of 3.4 Ã 10â3 S cmâ1 under about 19.2% R.H. at 130 °C.
Related Topics
Physical Sciences and Engineering
Chemical Engineering
Filtration and Separation
Authors
Masaki Kato, Wataru Sakamoto, Toshinobu Yogo,