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Phys Rev Lett. 2000 Oct 30;85(18):3854-7.

Molecular structure of polystyrene at Air/Polymer and Solid/Polymer interfaces

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The University of Akron, Akron, Ohio 44325, USA.


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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