NDLI: Viscoelasticity and diffusion in miscible blends of saturated hydrocarbon polymers

Content Provider	Springer Nature Link
Author	Gell, Carol B. Krishnamoorti, Ramanan Kim, Eugene Graessley, William W. Fetters, Lewis J.
Copyright Year	1997
Abstract	Linear viscoelasticity and tracer diffusion were investigated as functions of temperature, component molecular weight and blend composition for entangled, single-phase blends of nearly monodisperse poly(ethylene-alt-propylene) (PEP) and head-to-head polypropylene (HHPP). Both components are non-polar and, despite evidence for slight differences of component glass temperatures in their blends, the viscoelastic data obey time-temperature superposition rather well. The properties of the blends were compared at constant T-T g (blend) with predictions of the tube-model theories. The composition dependence of viscosity agrees best with the double-reptation prediction, as had been found earlier for molecular weight blends. The variation in plateau modulus with composition is consistent with reptation, but the changes are too small to provide a definitive test. The tracer diffusion coefficients, D * PEP and D * HHPP are nearly independent of composition, consistent with the reptation prediction and in sharp contrast with tracer diffusion for blends with specific associations. Results for the recoverable compliance depart from this pattern, varying differently and much less strongly with composition than the predictions of either single or double reptation. It thus seems that microstructural blends may behave in significantly more complex ways than molecular weight blends even for components with only weak dispersive interactions and rather modest differences in glass temperature and plateau modulus.
Starting Page	217
Ending Page	228
Page Count	12
File Format	PDF
ISSN	00354511
Journal	Rheologica Acta
Volume Number	36
Issue Number	3
e-ISSN	14351528
Language	English
Publisher	Steinkopff-Verlag
Publisher Date	1997-01-01
Publisher Place	Darmstadt
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Polymer melts miscible blends viscoelasticity tracer diffusion Polymer Sciences Condensed Matter and Material Sciences Materials Processing, Characterization, and Design
Content Type	Text
Resource Type	Article
Subject	Mechanics of Materials Condensed Matter Physics Materials Science

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