Abstract
Cotton linter nano-fibers (CLNFs) were prepared from cotton linters by a refining process. The prepared CLNFs were characterized for morphology, crystallinity and degree of polymerization. CLNF was used as a reinforcing agent in guar gum to improve its performance properties. Guar gum/CLNF nanocomposite films were prepared by a solution-casting process. CLNF was added in concentrations of 0.1, 0.25, 0.5 and 1.0 % (w/w) in guar gum. The prepared guar gum/CLNF nano-composite films were characterized for mechanical, thermal, rheological, crystallinity, water vapor transmission rate (WVTR) and light transparency properties. The enthalpy of melting and melting temperature of guar gum increased with increased concentration of CLNF; but up to 0.25 % (w/w) concentration, above which they started decreasing. Tensile strength and Young’s modulus of guar gum increased by 32 and 35 %, respectively, by 0.25 % (w/w) addition of CLNF; however, it decreased on further increase in the concentration of CLNF. The percentage elongation at break and WVTR decreased by 58 and 57 % for 0.25 % (w/w) CLNF-added guar gum. The observed improvements in the properties were due to better interaction between CLNF and guar gum. CLNF was found to have uniformly dispersed in guar gum on addition up to 0.25 % concentration; however, it started forming aggregates at higher concentration, as evident from scanning electron microscopy. Viscosity increased, whereas transparency decreased with increased concentration of CLNF in guar gum.
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Acknowledgments
The authors are thankful to the National Agricultural Innovation Project (NAIP), Indian Council of Agricultural Research (ICAR) for providing financial support for this work, through a project entitled “Synthesis and characterization of nanocellulose and its applications as biodegradable polymer composites to enhance their performance properties” (code number 417101). We are also thankful to the Society of Plastic Engineers (SPE) for giving us the opportunity to participate in Antec-Mumbai 2012 [39].
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Karande, V.S., Bharimalla, A.K., Vigneshwaran, N. et al. Cotton linter nano-fibers as the potential reinforcing agent for guar gum. Iran Polym J 23, 869–879 (2014). https://doi.org/10.1007/s13726-014-0283-2
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DOI: https://doi.org/10.1007/s13726-014-0283-2