通过壳聚糖与乙酸酐发生 N-乙酰化反应,制备了不同脱乙酰度的壳聚糖。 利用傅里叶变化红外光谱(FTIR)及紫外光谱对产物进行了表征。 将不同脱乙酰度壳聚糖在手抄纸上进行涂布,测试了涂布纸的力学性能及抗油脂性能。 利用 SEM 分析了纸张增强及抗油脂作用机理。 结果表明,乙酸酐与壳聚糖物质的量比在0. 6以下时,脱乙酰度与乙酸酐加入量成线性关系;纸张的力学性能及抗油脂指数随涂布量增加而增加,当涂布量达到 4. 8 g / m2 时,抗张指数提高了 50. 3% ;相同涂布量下,随着脱乙酰度降低,抗张指数逐渐降低;当涂布量超过 2. 32 g / m2 ,抗油脂指数增长趋缓;壳聚糖的成膜微观结构对涂布纸的力学性能及抗油脂性能有重要影响。

The chitosan samples with various degree of deacetylation were prepared by the reaction of N-acetylation between chitosan and acetic anhydride. The samples were characterized by FTIR and ultraviolet spectrum. The mechanical and fat resistance properties of hand-sheet coated by chitosan with different D. D. value were measured. The results indicated that there is a line correlation between D. D. value and the amount of the added acetic anhydride, while the molar ratio of acetic anhydride and chitosan is below 0. 6; the mechanical and fat resistance properties are improved as the weight of coating arises; the resistance index is improved by 50. 3% when the weight of coating reaches 4. 8 g / m2 ; at the same amount of coating weight, the resistance index decreases gradually as the D. D. value of chitosan decreases; while the weight of coating is above 2. 32 g / m2 , the increasing of fat resistance index slows down; the mechanical and fat resistance properties are greatly influenced by the microstructure of the film formed by chitosan.