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Proton Conductivity in Acid‐Blended Poly(4‐vinylimidazole)
Author(s) -
Pu Hongting,
Meyer Wolfgang H.,
Wegner Gerhard
Publication year - 2001
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 - 10.1002/1521-3935(20010601)202:9<1478::aid-macp1478>3.0.co;2-8
Subject(s) - conductance , conductivity , proton , arrhenius equation , glass transition , chemistry , polymer , proton transport , polymer chemistry , thermal conduction , materials science , activation energy , composite material , organic chemistry , condensed matter physics , physics , quantum mechanics
The temperature and pressure dependent conductivities of poly(4‐vinylimidazole) (P4VI) blended with H 3 PO 4 or H 2 SO 4 have been studied. The influence of the temperature on the conductance and activation volume is discussed. The temperature dependent conductivity of the samples in the glassy state can be fitted with a simple Arrhenius relation. The logarithm of relative conductance for P4VI blended with H 3 PO 4 decreases linearly with increasing pressure. With decreasing temperature the conductance decrease becomes more pronounced. It is proposed that the proton transport in P4VI with low acid concentrations is mainly controlled by a proton hopping mechanism. At high acid levels the proton transport is controlled by both proton hopping and segmental motion of the polymer. The glass transition marks a change in the proton transport mechanism, which is also reflected in the abnormal behavior of the activation volume of the conductance. The conductivities of P4VI blended with H 3 PO 4 and H 2 SO 4 are compared. The conductivity of H 3 PO 4 blended P4VI is lower than that of H 2 SO 4 blended P4VI at the same acid concentrations.