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Optical study of poly(vinyl alcohol)/hydroxypropyl methylcellulose blends

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Abstract

The proposal in this study was to evaluate the optical properties of different biopolymers films. The materials used were poly(vinyl alcohol) (PVA) and hydroxypropyl methylcellulose (HPMC). PVA/HPMC blends were prepared by casting technique. Variations in the group coordination in the infrared region were followed. The effects of HPMC concentrations on the optical properties of the PVA films were studied by near infrared, ultraviolet/visible, transmittance, and reflectance in the spectral region 200–2500 nm. Absorption, transmittance, and reflectance spectra were used for the determination of the optical constants. The study has been also extended to include the changes in the optical parameters including the band tail width and band gap energies and extinction coefficient for the investigated films. The results indicate that the optical band gap was derived from Tauc’s extrapolation and decreases with the HPMC contents. The obtained optical parameters were found to be strongly affected by HPMC contents.

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Acknowledgements

The authors are very grateful to the late Prof. Dr. El-Sayed A. Gaafar, Professor of Biophysics, Biophysics Department, Faculty of Science, Cairo University, Giza, Egypt, for his kind help to bring this study.

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  1. Biophysics Department, Faculty of Science, Cairo University, Giza, 12613, Egypt

    Osiris W. Guirguis & Manal T. H. Moselhey

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  1. Osiris W. Guirguis
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  2. Manal T. H. Moselhey
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Correspondence to Osiris W. Guirguis.

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Guirguis, O.W., Moselhey, M.T.H. Optical study of poly(vinyl alcohol)/hydroxypropyl methylcellulose blends. J Mater Sci 46, 5775–5789 (2011). https://doi.org/10.1007/s10853-011-5533-5

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