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Effect of mixed monomers on the synthesis of ion‐exchange membranes by radiation‐induced grafting
Author(s) -
Omichi Hideki,
Okamoto Jiro
Publication year - 1985
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.1985.070300331
Subject(s) - grafting , materials science , homogeneous , membrane , polymer , monomer , conductivity , copolymer , ion , polymer chemistry , ion exchange , electron microprobe , chemical engineering , chemistry , composite material , organic chemistry , thermodynamics , physics , biochemistry , engineering , metallurgy
Ion‐exchange membranes were synthesized by radiation‐induced grafting of methyl‐α,β,β‐trifluoroacrylate (MTFA) and also by cografting of MTFA with propylene. Although a larger grafting yield was obtained by cografting, the number of repeating units introduced in a unit volume of the graft films was unchanged. The electrical conductivity of the cografted polymer film was higher than that of the film grafted with MTFA alone when compared at the same number of repeating units. This result was well correlated with the difference in distribution of graft chains in polymer films observed by ESCA and EPMA. The more homogeneous the distribution was, the higher the electrical conductivity. It was suggested that an alternating copolymerization of MTFA with propylene was responsible for the homogeneous distribution of graft chains obtained by cografting.