TY - JOUR
T1 - Viscosity of salt-in-polymer solutions near the glass transition temperature by penetrometry, and pseudo-macromolecule behaviour at a critical composition in NaClO4-PPO(4000)
AU - McLin, M. G.
AU - Angell, Charles
PY - 1996/10
Y1 - 1996/10
N2 - The first viscosity measurements of pure PPO(4000) and PPO(4000) liquid polymer electrolytes at temperatures in the vicinity of the glass transition temperature are reported. At the lower temperatures, ion pairing effects on the transport coefficients are suppressed, permitting some general trends in the dependence of the Vogel-Tammann-Fulcher (VTF) viscosity equation parameters on the salt concentration to be discerned. These are discussed in terms of ion-polymer interactions. Anomalies are noted at the composition M/O = 1/30, where some previous studies have found phase separations and these are particularly striking in the case of NaClO4 solutions for which the VTF equation parameters cannot be reconciled with the observed calorimetric glass transition temperature. The existence of a low temperature thermoplastic (rubbery) domain, is identified and a special chain end linking mechanism, which is optimized in the NaClO4 case, is proposed to account for it.
AB - The first viscosity measurements of pure PPO(4000) and PPO(4000) liquid polymer electrolytes at temperatures in the vicinity of the glass transition temperature are reported. At the lower temperatures, ion pairing effects on the transport coefficients are suppressed, permitting some general trends in the dependence of the Vogel-Tammann-Fulcher (VTF) viscosity equation parameters on the salt concentration to be discerned. These are discussed in terms of ion-polymer interactions. Anomalies are noted at the composition M/O = 1/30, where some previous studies have found phase separations and these are particularly striking in the case of NaClO4 solutions for which the VTF equation parameters cannot be reconciled with the observed calorimetric glass transition temperature. The existence of a low temperature thermoplastic (rubbery) domain, is identified and a special chain end linking mechanism, which is optimized in the NaClO4 case, is proposed to account for it.
KW - Novel thermoplasticity
KW - Penetrometry
KW - Polymer electrolytes
KW - Viscosity near T
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U2 - 10.1016/S0032-3861(96)00315-1
DO - 10.1016/S0032-3861(96)00315-1
M3 - Article
AN - SCOPUS:0030266203
VL - 37
SP - 4713
EP - 4721
JO - Polymer (United Kingdom)
JF - Polymer (United Kingdom)
SN - 0032-3861
IS - 21
ER -