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Orientational order in poly-N-vinylpyrrolidone films

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Abstract

When a polarized ray is obliquely incident on a film, rotating the film around an axis perpendicular to its surface results in birefringence, which is studied in this paper. Surface birefringence in polyvinylpyrrolidone films was investigated as a function of the angle of incidence of light and the film thickness. The results made it possible to estimate the orientational-order parameter of segments of the polyvinylpyrrolidone macromolecules in the near-surface layers, as well as to compare the orientational order as a function of the length of a statistical segment of the chains of the polymer studied here with the orientational order of polystyrene molecules.

© 2015 Optical Society of America

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