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/lp/de-gruyter/pvc-poly-norbornene-ester-blends-mixtures-of-flexible-and-rigid-random-gLdvSU4sYn
- 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-Polymers – de Gruyter
Published: Dec 1, 2001