Miscibility and phase separation in SAN/PMMA blends investigated by positron lifetime measurements

Kumaraswamy, G. N. and Ranganathaiah, C. and Urs, M. V. Deepa and Ravikumar, H. B. (2006) Miscibility and phase separation in SAN/PMMA blends investigated by positron lifetime measurements. European Polymer Journal, 42 (10). 2655 - 2666. ISSN 1873-1945

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Miscibility and phase separation in SAN/PMMA blends have been investigated using DSC, IR spectroscopy and positron lifetime spectroscopy (PLS). Single broad glass transition observed throughout the blend compositions, may be due to overlap of two glass transitions. IR measurements clearly indicate the absence of strong interactions. This supports miscibility is due to intramolecular repulsive forces in the SAN component. On the other hand, free volume data show negative deviation from linear additivity indicating the blends are miscible. The interchain interaction parameter β exhibits a complex behavior and the extent of miscibility is not revealed. Following Wolf’s treatment, we have evaluated the geometry factor γ and hydrodynamic interaction parameter α and found α is a suitable parameter in predicting the miscibility window. The cloud points in SAN/PMMA blends increase with decreasing PMMA content. The change in free volume size correlates well with the observed change in cloud point.

Item Type: Article
Uncontrolled Keywords: Blends, Miscibility, -Positronium, Free volume, Geometric parameter, Hydrodynamic interaction, Phase separation
Subjects: D Physical Science > Physics
Divisions: Department of > Physics
Depositing User: LA manjunath user
Date Deposited: 12 Aug 2019 11:38
Last Modified: 12 Aug 2019 11:38
URI: http://eprints.uni-mysore.ac.in/id/eprint/6292

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