Ismaila, A. and Akusu, P. O. and Ahmed, T. O. (2015) Structural and Optical Properties of Polymer Blend Nanocomposites Based on Poly (vinyl acetate-co-vinyl alcohol)/ TiO2 Nanoparticles. Physical Science International Journal, 7 (4). pp. 252-261. ISSN 23480130
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Abstract
Titanium dioxide and organic polymer blend poly (vinyl acetate-co-vinyl alcohol) based nanocomposite membranes were prepared and their chemical structure, phase relationship and optical properties investigated. The Scanning Electron Microscopy (SEM) coupled with Energy Dispersive X-ray Spectroscopy (EDS) analysis reveals TiO2 to be almost isomorphic (≥99% phase purity) with spherical particles having diameters in the range 25-40 nm. The composites were characterized by Fourier Transform Infrared (FTIR), SEM, X-Ray Diffraction (XRD) and Ultraviolet-visible (UV-vis) Spectrophotometry. The FTIR Spectroscopy reveals significant absorptions below 900 cm-1 to represent Titanium bonds with organic groups and Oxygen while other prominent functional groups above 900 cm-1 reflect the additivity of polyvinyl alcohol and polyvinyl acetate. It was found that embedding inorganic nanoparticles of TiO2 into the polymer blend matrix of poly (vinyl acetate-co-vinyl alcohol) allowed for some crystallinity formation and cross-linking of the polymer composites during annealing. The XRD results show more defined peaks assigned to each phase of the composite as the TiO2 content increases from 1 to 4% weight ratio, thus indicating that Nanoparticle filler remain in the semi-crystalline polymer matrix as a separate crystalline phase, which is in good agreement with the SEM. Finally, the resonant coupling between Ultraviolet-visible (UV-vis) light and the collective electronic transitions of polymer nanocomposites are examined using UV-vis Spectrophotometer. The variation in the percentage absorbance and transmittance over wavelength range 200 nm-900 nm is also attributed to TiO2 Nanoparticles (Nps) content (1-4%) in the samples.
Item Type: | Article |
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Subjects: | Open Research Librarians > Physics and Astronomy |
Depositing User: | Unnamed user with email support@open.researchlibrarians.com |
Date Deposited: | 15 Jun 2023 12:14 |
Last Modified: | 22 Jan 2024 04:54 |
URI: | http://stm.e4journal.com/id/eprint/1153 |