Thermoplastic elastomers by hydrogen bonding 4. Influence of hydrogen bonding on the temperature dependence of the viscoelastic properties |
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Authors: | L de Lucca Freitas R Stadler |
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Institution: | (1) Present address: Institut für Makromolekulare Chemie, Hermann Staudinger Haus, Freiburg, F.R.G. |
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Abstract: | The temperature dependence of the viscoelastic properties of thermoreversible polybutadiene networks based on hydrogen bond linkages is analyzed from the logarithmic shift factors loga
T
. For binary hydrogen bond complexes thermorheologically simple behavior is observed. The temperature dependence of loga
T
is described by the Williams-Landel-Ferry (WLF) equation. The thermoreversible linkages cause an increase in the apparent activation enthalpy of flow which is related to the number of complexing sites in the polymer. Thermorheologically complex behavior is observed in a system with more complex association. |
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Keywords: | Viscoelasticity polybutadienenetworks WLF-equation activation energy of flow thermoreversible networks |
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