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Dynamic mechanical behavior of poly(vinyl chloride)/poly(methyl methacrylate) polymer blend |
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| Authors: | R. Flores J. Perez P. Cassagnau A. Michel J. Y. Cavaillé |
| Affiliation: | 1. Groupe d'Etudes de Métallurgie Physique et de Physique des Matériaux (GEMPPM), UA CNRS 341, INSA, 69621 Villeurbanne Cedex, France Industrias Negromex SA, P. O. Box 257-C, 89000 Tampico, Tamps, Mexico;2. Groupe d'Etudes de Métallurgie Physique et de Physique des Matériaux (GEMPPM), UA CNRS 341, INSA, 69621 Villeurbanne Cedex, France;3. Laboratoire de Matériaux Organiques à Propriétés Spécifiques (LMOPS), CNRS, 69390 Vernaison, France |
| Abstract: | A poly(vinyl chloride) (PVC)/poly(methyl methacrylate) (PMMA) (80/20 w/w) polymer blend was studied by mechanical spectroscopy. Two relaxations can be distinguished: in the glassy state, a very large secondary relaxation in the range of 100 K to 325 K which results from the combination of secondary relaxations of PVC and PMMA; and only one main relaxation at 364 K associated to the glass rubber transition. The relaxation spectrum in the range of the β relaxation has been described by a relaxation time distribution function based upon a Gaussian function and a series-parallel model. The α relaxation was studied by means of a theoretical approach for the nonelastic deformation of polymers. We found that the miscibility of this blend appears to be a function of the observation scale: the PVC/PMMA blend is heterogeneous at the scale of molecular movements involved for the β relaxation process but homogeneous at the scale of the chain segments responsible for the α relaxation dynamics. © 1996 John Wiley & Sons, Inc. |
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