Preparation and Characterization of Gamma Irradiated Sugar Containing Starch/Poly (Vinyl Alcohol)-Based Blend Films |
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Authors: | Fahmida Parvin Mubarak A Khan A H M Saadat M Anwar H Khan Jahid M M Islam Mostak Ahmed and M A Gafur |
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Institution: | (1) Institute of Radiation and Polymer Technology, Bangladesh Atomic Energy Commission, Dhaka, Bangladesh;(2) Department of Environmental Sciences, Jahangirnagar University, Savar, Dhaka, Bangladesh;(3) Department of Geography, University of California Berkeley, Berkeley, CA 94720, USA;(4) PP and PDC, BCSIR, Dhaka, Bangladesh; |
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Abstract: | Blends based on different ratios of starch (35–20%) and plasticizer (sugar; 0–15%) keeping the amount of poly(vinyl alcohol)
(PVA) constant, were prepared in the form of thin films by casting solutions. The effects of gamma-irradiation on thermal,
mechanical, and morphological properties were investigated. The studies of mechanical properties showed improved tensile strength
(TS) (9.61 MPa) and elongation at break (EB) (409%) of the starch-PVA-sugar blend film containing 10% sugar. The mechanical
testing of the irradiated film (irradiated at 200 Krad radiation dose) showed higher TS but lower EB than that of the non-radiated
film. FTIR spectroscopy studies supported the molecular interactions among starch, PVA, and sugar in the blend films, that
was improved by irradiation. Thermal properties of the film were also improved due to irradiation and confirmed by thermo-mechanical
analysis (TMA), differential thermo-gravimetric analysis (DTG), differential thermal analysis (DTA), and thermo-gravimetric
analysis (TGA). Surface of the films were examined by scanning electron microscope (SEM) image that supported the evidence
of crosslinking obtained after gamma irradiation on the film. The water up-take and degradation test in soil of the film were
also evaluated. In this study, sugar acted as a good plasticizing agent in starch/PVA blend films, which was significantly
improved by gamma radiation and the prepared starch-PVA-sugar blend film could be used as biodegradable packaging materials. |
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