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Development of radiation‐grafted FEP‐ g ‐polystyrene membranes: Some property–structure correlations
Author(s) -
Gupta Bhuvanesh,
Büchi Felix N.,
Scherer Günther G.,
Chapiro Adolphe
Publication year - 1994
Publication title -
polymers for advanced technologies
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.61
H-Index - 90
eISSN - 1099-1581
pISSN - 1042-7147
DOI - 10.1002/pat.1994.220050905
Subject(s) - membrane , crystallinity , materials science , grafting , thermogravimetric analysis , ionic bonding , swelling , thermal stability , chemical engineering , polymer chemistry , polystyrene , ion exchange , ionic conductivity , styrene , ion , polymer , composite material , copolymer , chemistry , organic chemistry , electrolyte , biochemistry , electrode , engineering
Abstract Property–structure correlation in proton exchange membranes, prepared by simultaneous radiation grafting of styrene into FEP films and their subsequent sulfonation, was evaluated. The distribution of ionic sites across the membrane matrix was determined by microprobe measurements. The properties of these membranes, such as ion exchange capacity, swelling and ionic resistivity as a function of the degree of grafting, were studied. The thermal stability of membranes was studied using thermogravimetric analysis and ion exchange capacity measurements. Membranes undergo considerable structural changes in terms of the increase in the ionic content, enhanced hydrophilicity and decrease in crystallinity with the increasing degree of grafting. A correlation between some physical properties and stuctural changes occurring during the membrane preparation was established.