Effect of montmorillonite on morphology,glass transition and crystallinity of the xylitol-plasticized bionanocomposites |
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Authors: | Huihua Liu Deeptangshu Chaudhary |
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Institution: | 1. School of Health Sciences, University of Ballarat, Mount Helen, VIC 3350, Australia;2. Department of Chemical Engineering, Curtin University of Technology, Perth, Australia |
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Abstract: | High amylose based nanocomposites plasticized by xylitol were prepared via twin-screw extrusion. The synergistic interaction in the xylitol-plasticized nanocomposite was studied via various characterization methods and the unique behavior of the xylitol-plasticized nanocomposite had been discussed. As revealed in the XRD and TEM results, good intercalated/exfoliated morphology had been achieved in all the nanocomposites. Furthermore, the expansion of nanoclay basal spacing was related to the xylitol/nanoclay ratio. DSC analysis clearly proved the unique crystallization process of xylitol-plasticized samples. Moreover, in the crystallization domain results, two domains sized at approximately 93.7 Å and 346 Å were found. This observation points to a two-level complex effect from two aggregate domains; one, the re-aggregation of certain number of silicate layers into domains which trap some of the amylose polymer chains, and two, the bulk drying process which combines smaller amylose crystalline domains within a larger amorphous high amylose matrix. |
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Keywords: | Nanocomposite Starch Xylitol XRD SAXS DSC |
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