TY - JOUR
T1 - Free radical polymerization kinetics of vinylsulfonic acid and highly acidic properties of its polymer
AU - Okayasu, Teruyuki
AU - Hibino, Toshiyasu
AU - Nishide, Hiroyuki
PY - 2011/5/17
Y1 - 2011/5/17
N2 - 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 × 104. 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. Poly(vinylsulfonic acid) (PVS) has a high acid density (IEC=9.2 meq·g-1) and is the solid-state organic analog of sulfuric acid. Radical polymerization of the acid form of vinylsulfonic acid is kinetically investigated. PVS with a high molecular weight is obtained as a transparent membrane and shows a high proton-conductivity under both hydrated and nonhumidified conditions.
AB - 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 × 104. 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. Poly(vinylsulfonic acid) (PVS) has a high acid density (IEC=9.2 meq·g-1) and is the solid-state organic analog of sulfuric acid. Radical polymerization of the acid form of vinylsulfonic acid is kinetically investigated. PVS with a high molecular weight is obtained as a transparent membrane and shows a high proton-conductivity under both hydrated and nonhumidified conditions.
KW - kinetics
KW - proton-conductivity
KW - radical polymerization
KW - sulfonic acid polymer
KW - vinyl compound
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U2 - 10.1002/macp.201000773
DO - 10.1002/macp.201000773
M3 - Article
AN - SCOPUS:79956081233
SN - 1022-1352
VL - 212
SP - 1072
EP - 1079
JO - Macromolecular Chemistry and Physics
JF - Macromolecular Chemistry and Physics
IS - 10
ER -