Molecular structure of polystyrene at Air/Polymer and Solid/Polymer interfaces |
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Authors: | Gautam Schwab Dhinojwala Zhang Dougal Yeganeh |
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Institution: | The University of Akron, Akron, Ohio 44325, USA. |
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Abstract: | IR-visible sum-frequency generation (SFG) spectroscopy has been used in a total internal reflection geometry to study the molecular structure of polystyrene (PS) at PS/sapphire and PS/air interfaces, simultaneously. The symmetric vibrational modes of the phenyl rings dominate the SFG spectra at the PS/air interface as compared to the antisymmetric vibrational modes at the PS/sapphire interface. This indicates approximately parallel orientation of the phenyl rings at the PS/air interface while nearly perpendicular orientation at the PS/sapphire interface, with respect to the surface normal. |
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