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

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 regio...

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Bibliographic Details
Published in:Journal of materials science 2011-09, Vol.46 (17), p.5775-5789
Main Authors: Guirguis, Osiris W., Moselhey, Manal T. H.
Format: Article
Language:English
Subjects:
Alcohol
Alcohols
Biopolymers
Blends
Characterization and Evaluation of Materials
Classical Mechanics
Crystallography and Scattering Methods
Energy gap
Materials Science
Methylcellulose
Optical properties
Parameters
Polymer blends
Polymer Sciences
Polyvinyl alcohol
Polyvinyl alcohols
Reflectance
Solid Mechanics
Spectra
Transmittance
Ultraviolet reflection
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Summary: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.
ISSN:0022-2461
1573-4803
DOI:10.1007/s10853-011-5533-5