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Order To Disorder Transition at The Polymer-Air Interface for Hydrophobic Octadecyl Side Chain Copolymers

Published online by Cambridge University Press:  21 March 2011

Keshav S. Gautam  and
Ali Dhinojwala
Keshav S. Gautam
Affiliation:
Department of Polymer Science, University of Akron, Akron, OH 44325, USA
Ali Dhinojwala
Affiliation:
Department of Polymer Science, University of Akron, Akron, OH 44325, USA
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Abstract

Molecular orientation of octadecyl alkyl side chains at the poly (vinyl octadecyl carbamates-co-vinyl acetate) polymer-air interface has been studied using surface sensitive sum frequency generation (SFG) spectroscopy. At 280C, below the side chain crystalline transition temperature, the SFG spectra show strong methyl vibrations indicating ordered alkyl side chains at the polymer-air interface. In the liquid state (980C), the SFG spectra show higher contributions from the methylene vibrations indicating higher gauche defects at the interface. This surface order to disorder transition is gradual and spans over a broad temperature range (50-900C), where the bulk is in the smectic liquid crystalline state.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 661: Symposium KK – Filled & Nanocomposite Polymer Materials , 2000 , KK6.3
Copyright
Copyright © Materials Research Society 2001

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