A new insight into interface widths in binary polymer blends based on ortho-positronium lifetime studies.

Ramya, P. and Ranganathaiah, C. (2013) A new insight into interface widths in binary polymer blends based on ortho-positronium lifetime studies. Journal of Applied Polymer Science, 127 (1, Cop). pp. 190-199. ISSN 0021-8995

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Official URL: http://dx.doi.org/10.1002/app.37872


The interface widths in two immiscible polymer blend Poly vinyl chloride (PVC)/Polystyrene (PS) and PVC/Ethylene Vinyl Acetate (EVA) are detd. exptl. using hydrodynamic interaction approach through free vol. measurement by positron annihilation lifetime spectroscopy. For comparison, the same study is performed in a miscible blend Styrene Acrylonitrile copolymer (SAN)/Poly Me Methacrylate (PMMA). The interfacial width (Δl) is evaluated from the hydrodynamic interaction (α) based on Kirkwood-Risemann theory and friction coeff. from Stokes equation. Friction at the interface of a binary blend evidences how close the surfaces of the polymer chains come or stay apart which in turn depends on the type of force/interaction at the interface. In this work, we define interface width from a different perspective of Flory-Huggins interaction approach. Measured compn. dependent interface widths in the three blends studied clearly demonstrate the sensitivity of the present method. In miscible blend, high friction at the interface results in stronger hydrodynamic interaction and hence smaller interface widths (0.36-1.97 Å), whereas weak or no interaction in immiscible blends produce wider widths (2.81-25.0 Å). © 2012 Wiley Periodicals, Inc. J. Appl. Polym. Sci., 2012. [on SciFinder(R)]

Item Type: Article
Additional Information: Unmapped bibliographic data: PY - 2013/// [EPrints field already has value set] M3 - 10.1002/app.37872 [Field not mapped to EPrints] JA - J. Appl. Polym. Sci. [Field not mapped to EPrints]
Uncontrolled Keywords: interface widths binary polymer blend positronium lifetime
Subjects: Physical Sciences > Physics
Divisions: PG Campuses > Manasagangotri, Mysore > Physics
Depositing User: Kodandarama
Date Deposited: 03 Jul 2013 10:50
Last Modified: 11 Oct 2013 07:32
URI: http://eprints.uni-mysore.ac.in/id/eprint/13284

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