衣康酸对壳聚糖进行水性改性制备强阻氧膜,Biomacromolecules

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衣康酸对壳聚糖进行水性改性制备强阻氧膜
Biomacromolecules ( IF 5.5 ) Pub Date : 2021-04-29 , DOI: 10.1021/acs.biomac.1c00216
Juho Antti Sirviö ₁ , Anu M Kantola ₂ , Sanna Komulainen ₂ , Svitlana Filonenko ₃

Affiliation

在这项研究中，研究了使用衣康酸作为天然不饱和二羧酸对壳聚糖的化学改性。在水性环境中，壳聚糖的胺基团与衣康酸反应生成具有吡咯烷酮-4-羧酸基团的壳聚糖衍生物。根据元素分析，15% 的壳聚糖胺基发生反应，从而产生具有胺和羧酸官能团的改性壳聚糖。由于胺和羧酸基团的存在，衣康酸改性后壳聚糖的表面电荷性质发生了显着变化。在水溶液中，改性壳聚糖表现出两性离子特性，在低 pH 值时呈阳离子，当 pH 值超过 6.5 时变为阴离子，而原始壳聚糖在 pH 值为 9 时仍保持阳离子状态。此外，结果表明，与由原始壳聚糖制成的薄膜相比，改性壳聚糖适用于制备具有同样高透明度但机械强度和氧气阻隔性能显着更高的自支撑薄膜。此外，改性壳聚糖膜的热稳定性高于原壳聚糖膜，且改性壳聚糖表现出阻燃性能。

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Aqueous Modification of Chitosan with Itaconic Acid to Produce Strong Oxygen Barrier Film

In this study, the chemical modification of chitosan using itaconic acid as a natural-based unsaturated dicarboxylic acid was investigated. In an aqueous environment, the amine group of chitosan reacts with itaconic acid to produce a chitosan derivative with pyrrolidone-4-carboxylic acid group. On the basis of the elemental analysis, 15% of the amine groups of chitosan reacted, thus creating modified chitosan with amine and carboxylic acid functionalities. Due to the presence of amine and carboxylic acid groups, the surface charge properties of the chitosan were notably altered after itaconic acid modification. In an aqueous solution, the modified chitosan exhibited zwitterionic properties, being cationic at low pH and turning anionic when the pH was increased over 6.5, whereas the original chitosan remained cationic until pH 9. Furthermore, it was demostrated that the modified chitosan was suitable for the preparation of a self-standing film with similarly high transparency but notably higher mechanical strength and oxygen barrier properties compared to a film made from the original chitosan. In addition, the thermal stability of the modified chitosan film was higher than that of the original chitosan film, and the modified chitosan exhibited flame-retardant properties.

更新日期：2021-05-10

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