Performance improvement of starch films reinforced with starch nanocrystals (SNCs) modified by cross-linking

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• 作者：Lili Ren ; Youjia Fu ; Yanjiao Chang ; Man Jiang ; Jin Tong and Jiang Zhou
• 刊名：Starch - Strke
• 出版年：2017
• 出版时间：January 2017
• 年：2017
• 卷：69
• 期：1-2
• 全文大小：808K
• ISSN：1521-379X

文摘

Starch nanocrystals (SNCs) obtained from acid hydrolysis of waxy corn starch were modified by cross-linking using either sodium hexametaphosphate or glutaraldehyde in water. The cross-linking preserved the crystalline structure of SNCs and improved the dispersion of SNCs in water. Thermoplastic starch (TPS) nanocomposite films reinforced with SNCs or the cross-linked SNCs were prepared by casting and evaporation. Compared with the SNCs/TPS film, the tensile strength and elongation at break of the cross-linked SNC-reinforced TPS films were increased and the Young's modulus was remained almost unchanged. Moreover, the moisture barrier was enhanced for TPS nanocomposite films reinforced with cross-linked SNCs. The performance improvement of the cross-linked SNC-reinforced TPS nanocomposite films was attributed to better dispersion of the cross-linked SNCs in TPS matrix and different reinforcement/matrix interactions.