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Haley, Jeffrey C.
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Publications (5/5 displayed)
- 2006Two calorimetric glass transitions do not necessarily indicate immiscibilitycitations
- 2005Viscosity predictions for model miscible polymer blendscitations
- 2004Failure of time-temperature superposition in dilute miscible polymer blendscitations
- 2004A framework for predicting the viscosity of miscible polymer blendscitations
- 2003Composition and temperature dependence of terminal and segmental dynamics in polyisoprene/poly(vinylethylene) blendscitations
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article
Failure of time-temperature superposition in dilute miscible polymer blends
Abstract
<p>The dynamic viscosity for miscible blends of 1,4-polyisoprene and poly(vinyl ethylene) (PVE) at the extremes of composition (1% tracer in 99% matrix) has been measured as a function of temperature. Time-temperature superposition failure is observed in these tracer blends. This observation indicates that intramolecular contributions are crucial in defining the local environment experienced by a polymer segment, as anticipated by self-concentration models. The temperature dependence of the dynamics of the PVE tracer has been extracted, and compared with the model of Lodge and McLeish. The self-concentration effect was found to be even stronger than predicted.</p>