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PVC/poly(norbornene ester) blends: mixtures of flexible and rigid random coils

PVC/poly(norbornene ester) blends: mixtures of flexible and rigid random coils AbstractConsidered are blends of the flexible coil-shaped poly(vinyl chloride) (PVC) and rigid coil-shaped polymers, poly(norbornene ester)s, characterized by strong rotational constraints. The unexpected finding is that the stepwise increase of the specific heat at the glass transition Tg as well as the relaxation of the enthalpy in a temperature interval below Tg (physical aging) vanish as the concentration of poly(norbornene ester)s increases in blends with PVC. The interpretation is that the very specific nature of the glass transition of the rotationally confined poly(norbornene ester) - cooperative librations within the minima of the rotational potential - controls the relaxation properties of the blends. The composition vs. glass transition temperature relation is strongly curved for the blends due to the very small increase of the specific heat of the poly(norbornene ester)s at the glass transition. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png e-Polymers de Gruyter

PVC/poly(norbornene ester) blends: mixtures of flexible and rigid random coils

e-Polymers , Volume 1 (1): 1 – Dec 1, 2001

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Publisher
de Gruyter
Copyright
© 2013 by Walter de Gruyter GmbH & Co.
ISSN
2197-4586
eISSN
1618-7229
DOI
10.1515/epoly.2001.1.1.41
Publisher site
See Article on Publisher Site

Abstract

AbstractConsidered are blends of the flexible coil-shaped poly(vinyl chloride) (PVC) and rigid coil-shaped polymers, poly(norbornene ester)s, characterized by strong rotational constraints. The unexpected finding is that the stepwise increase of the specific heat at the glass transition Tg as well as the relaxation of the enthalpy in a temperature interval below Tg (physical aging) vanish as the concentration of poly(norbornene ester)s increases in blends with PVC. The interpretation is that the very specific nature of the glass transition of the rotationally confined poly(norbornene ester) - cooperative librations within the minima of the rotational potential - controls the relaxation properties of the blends. The composition vs. glass transition temperature relation is strongly curved for the blends due to the very small increase of the specific heat of the poly(norbornene ester)s at the glass transition.

Journal

e-Polymersde Gruyter

Published: Dec 1, 2001

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