Characterization of Nanofiller on Multi-scale Structures and Thermal Property of Starch Ester Film
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Abstract:
The starch-based film was prepared by solvent-casting method. G50 starch ester with high degree of substitution was plasticized by triacetin and composited with organically modified montmorillonite (Dellite 72T). The features of fractured surface of the nanocomposites and the dispersion of nanofiller were analyzed by SEM and TEM. FTIR, SAXS and XRD techniques were used to characterize the molecular structures, ordered aggregation region and crystalline structures. The thermal property of starch ester film was detected by TG technology. The results indicated that some wrinkles of macromolecular aggregation were developed after the nanofiller addition, which was caused by the increasing interaction between nanofillerand G50 starch ester. The layered structures with different thickness (d≈12.57 nm, 19.68 nm) were observed in the nanocomposite，while the crystalline structures of film and the layered structures of nanofiller were scarcely changed, and simultaneously, partly intercalated structures were formed. Therefore, the thermal stability of nanocomposite was improved due to these featured aggregation structures. These findings could be helpful to the further application of starch-based materials in food packaging industry via the structural modification of starch.
