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Free Radical Polymerization Kinetics of Vinylsulfonic Acid and Highly Acidic Properties of its Polymer
Author(s) -
Okayasu Teruyuki,
Hibino Toshiyasu,
Nishide Hiroyuki
Publication year - 2011
Publication title -
macromolecular chemistry and physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.57
H-Index - 112
eISSN - 1521-3935
pISSN - 1022-1352
DOI - 10.1002/macp.201000773
Subject(s) - chemistry , monomer , polymerization , radical polymerization , polymer chemistry , dissociation (chemistry) , polymer , kinetics , conductivity , radical initiator , organic chemistry , quantum mechanics , physics
Poly(vinylsulfonic acid) (PVS) possesses a high acid content (ion‐exchange capacity in the chemical formula = 9.2 meq · g −1 ). Its monomer, vinylsulfonic acid (VSA), had a high acid dissociation ability (Hammett acid function = 0.74 in water), and a high ionic conductivity (0.04–0.11 S · cm −1 ). The radical polymerization of VSA with various initiators was kinetically investigated. The ESR spectrum of the VSA polymerization mixture showed a strong signal ascribed to the propagation carbon radical of VSA. The molecular weight of PVS increased with the increasing monomer concentration and decreasing radical initiator concentration to yield the PVS with a molecular weight of 4.0 × 10 4 . Proton‐conductivity of PVS under hydrated and nonhumidified conditions was on the order of 10 −1 and 10 −3 –10 −6 S · cm −1 , respectively.