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Critical ion concentrations for clusters in sodium sulfonated polystyrene lonomers
Author(s) -
Park JungKi,
Park ByungKyu,
Ryoo Ryong
Publication year - 1991
Publication title -
polymer engineering and science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.503
H-Index - 111
eISSN - 1548-2634
pISSN - 0032-3888
DOI - 10.1002/pen.760311206
Subject(s) - ionomer , polystyrene , ion , materials science , sodium , polymer , dissociation (chemistry) , glass transition , viscosity , analytical chemistry (journal) , polymer chemistry , chemistry , chromatography , organic chemistry , copolymer , composite material , metallurgy
The critical ion concentration of sodium sulfonated polystyrene ionomer has been investigated by glass transition, NMR and viscosity measurements. It was found that the critical ion concentration was affected by the molecular weight. The critical ion concentration could be explained by using the linewidths and chemical shifts of 23 Na + NMR spectra. The 23 Na + linewidths of the ionomer solution increased with ion concentration, which could be explained in terms of a shift in the association‐dissociation equilibrium between the Na + and the counter‐ion group of the polymer side chain. The reduced viscosity behavior also showed a consistent critical ion concentration.