Abstract
Thermoplastic starch (TPS) matrix was reinforced with various kenaf bast cellulose nanofiber loadings (0–10 wt%). Thin films were prepared by casting and evaporating the mixture of aqueous suspension of nanofibers (NFs), starch, and glycerol which underwent gelatinization process at the same time. Moreover, raw fibers (RFs) reinforced TPS films were prepared with the same contents and conditions. The effects of filler type and loading on different characteristics of prepared materials were studied using transmission and scanning electron microscopies, X-ray diffractometry, Fourier transform infrared spectroscopy, thermogravimetric analysis, differential scanning calorimetry, and moisture absorption analysis. Obtained results showed a homogeneous dispersion of NFs within the TPS matrix and strong association between the filler and matrix. Moreover, addition of nanoreinforcements decreased the moisture sensitivity of the TPS film significantly. About 20 % decrease in moisture content at equilibrium was observed with addition of 10 wt% NFs while this value was only 5.7 % for the respective RFs reinforced film.







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Acknowledgements
Authors would like to thank Mrs. Ashraf Zohrabi for her sincere assistance in preparing nanocomposite samples. Many thanks are expressed to Mr. Mehdi Hassani for his faithful support and help in editing the manuscript. The institute of tropical forestry and forest products (INTROP) is acknowledged for financial and technical support of the research.
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Karimi, S., Dufresne, A., Md. Tahir, P. et al. Biodegradable starch-based composites: effect of micro and nanoreinforcements on composite properties. J Mater Sci 49, 4513–4521 (2014). https://doi.org/10.1007/s10853-014-8151-1
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DOI: https://doi.org/10.1007/s10853-014-8151-1


