Long-Chain Anhydride Modification: A New Strategy for Preparing Xylan Films

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• 作者：Lin-Xin Zhong ; Xin-Wen Peng ; Dong Yang ; Xue-Fei Cao ; Run-Cang Sun
• 刊名：Journal of Agricultural and Food Chemistry
• 出版年：2013
• 出版时间：January 23, 2013
• 年：2013
• 卷：61
• 期：3
• 页码：655-661
• 全文大小：385K
• 年卷期：v.61,no.3(January 23, 2013)
• ISSN：1520-5118

文摘

Xylan, which is a widely abundant plant polymer, has been considered as an alternative for film preparation. Up to now, however, xylan films have suffered from brittleness, low mechanical strength, and humidity sensitivity. This paper describes a new and effective strategy to prepare xylan films with high mechanical strength and less moisture-sensitive properties by introducing long carbon chains into the xylan backbone. Furthermore, this work revealed some important details on the relationships between structure (molecular structure, aggregation behaviors, and surface morphology) and properties (film-forming performance, flexibility, tensile strength, and hydrophilicity) of xylan film. It was found that the hydrophobic carbon chains (2-octenylsuccinic anhydride half-ester groups) in the xylan backbone acted as steric hindrance and could effectively prevent xylan chains from aggregation. 2-Octenylsuccinic anhydride (2-OSA) modified xylan (2-OSA-X) demonstrated amorphous structure and had better film-forming performance than the unmodified xylan. 2-OSA-X films were smooth, flexible, and less moisture-sensitive and showed significantly increasing tensile strength at a low degree of substitution.

Keywords:

xylan; 2-octenylsuccinic anhydride; film; internal plasticization