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Effect of nano-alumina concentration on the mechanical, rheological, barrier and morphological properties of guar gum

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Abstract

In this work, nano-alumina was utilized as a reinforcing agent for guar gum, with an aim to improve its performance properties; especially, mechanical and barrier i.e. water vapor transmission rate (WVTR). Films were prepared by the process of solution casting. Concentration of nano-alumina was varied as 0, 1, 3, 5 and 7 parts per hundred parts of resin (phr) in guar gum. The prepared pristine and guar gum/alumina nano-composite films were characterized for mechanical, puncture, x-ray diffraction, barrier, rheological and morphological properties. Tensile strength, Young’s modulus, puncture strength, viscosity and crystallinity increased; whereas, WVTR, elongation at break (%) and damping factor decreased with increased concentration of nano-alumina in guar gum. However, optimized improvement in the performance properties were determined for 5 phr nano-alumina loaded guar gum polymer matrix, attributed to its better dispersion and interaction into the guar gum polymer chains due to the hydrophilic nature of both the materials. Above 5 phr concentration nano-alumina started forming aggregates, as evident from scanning electron microscopy.

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Acknowledgments

The authors gratefully acknowledge the financial support provided by The University Grant Commission under the SAP-DRS scheme for the present work. Authors are also grateful to the Institute of Chemical Technology for the research facilities provided to perform this research work.

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Correspondence to Shashank Mhaske.

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Research highlights

• Utilization of nano-alumina to improve the performance property of guar gum

• Appreciable improvement in mechanical and barrier properties

• Showed non-Newtonian shear-thinning and non-thixotropic flow behavior

• 5 phr is the optimized concentration of nano-alumina to be added in guar gum

• Possible application in food and pharmaceutical packaging

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Savvashe, P., Kadam, P. & Mhaske, S. Effect of nano-alumina concentration on the mechanical, rheological, barrier and morphological properties of guar gum. J Food Sci Technol 53, 1948–1956 (2016). https://doi.org/10.1007/s13197-015-2114-7

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  • DOI: https://doi.org/10.1007/s13197-015-2114-7

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