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Sulfonated polypropylene ionomers
Author(s) -
Dassaud J. P.,
Gallot B.,
Guyot A.,
Spitz R.,
Beautemps J. P.,
Williams C.,
Bourgaux C.,
Eisenberg A.
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.1994.220050201
Subject(s) - comonomer , crystallinity , materials science , polypropylene , ionomer , copolymer , small angle x ray scattering , polymer chemistry , polymer , thermal decomposition , chemical engineering , composite material , organic chemistry , chemistry , physics , scattering , optics , engineering
Polypropylene ionomers have been prepared by sulfonation of copolymers of propene and 7 methyl, 1‐6 octadiene, followed by neutralization to cesium salts. Both WAXS and SAXS were used to study the morphology of the samples, while their thermal properties were studied by DSC and their mechanical properties by DMTA. The sulfonation process is shown to cause a further drop in crystallinity in addition to the effect of comonomer incorporation. Ion clustering is observed when the extent of sulfonation is high enough, the limit being dependent on the copolymer composition. The ion pairs which are not incorporated into the cluster cause a small‐angle upturn in the WAXS pattern. The mechanical properties are strongly affected by the drop in crystallinity, but may be partly recovered due to ion clustering. No disruption of the ion clusters is observed before thermal decomposition of the polymer.