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RHEOLOGICAL AND MORPHOLOGICAL STUDIES OF CHITOSAN/AGAR/POLY (VINYL ALCOHOL) BLENDS
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| Author:
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PRIYA PATEL
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| Abstract:
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In this work, deals with blends of chitosan (CS) with agar (AG) and/or polyvinyl alcohol (PVA) at different proportions were prepared. The rheological properties i.e. shearing viscosity and shear stress of the blend solutions as a function of shear rate along with thermal properties of the blend were investigated. Results showed that a newtonian behavior was observed at temperatures from 400 c to 550 c for the ratios 90/05/05 and 70/15/15. The mixture solutions become pseudoplastic (shear thinning) when the concentrations of agar and PVA were higher than 10 % each. It was also found that all the blend Solutions obeyed the arrhenius equation. In addition, the effect of the shearing time on the shearing viscosity did not show any significant change at all shearing times applied for lower concentrations than 15% of each of agar and PVA in this study. When the period of storage was extended to three weeks. The observations obtained from the rheological measurement suggested the existence of interaction between the three polymers. Finally, the morphology of the blended films confirmed the interaction between the functional groups of the blend components.
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| Keyword:
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Chitosan, PVA, Agar, Blending
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| EOI:
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| DOI:
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