Failure of time-temperature superposition in dilute miscible polymer blends

Failure of time-temperature superposition in dilute miscible polymer blends

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...

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Veröffentlicht in:Colloid and polymer science 2004-06, Vol.282 (8), p.793-801
Hauptverfasser: HALEY, Jeffrey C, LODGE, Timothy P
Format: Artikel
Sprache:eng
Schlagworte:
Applied sciences
Blends
Dynamics
Ethylene
Exact sciences and technology
Failure
Mathematical models
Organic polymers
Physicochemistry of polymers
Polymer blends
Properties and characterization
Rheology and viscoelasticity
Segments
Temperature
Tracers
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Zusammenfassung: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.[PUBLICATION ABSTRACT]
ISSN:0303-402X
1435-1536
DOI:10.1007/s00396-004-1092-5