利用可控层层自组装法提高纤维素膜的力学性能

Improving the Mechanical Strength of Cellulose Membrane Through Controllable Layer-by-Layer Self-Assembly

通过水溶性耦合试剂N-(3-二甲氨基丙基)-N′-乙基碳二亚胺盐酸盐(EDC)/N-羟基琥珀酰亚胺(NHS)将小分子4-羧基苯硼酸(PBA)与壳聚糖以形成酰胺键的方式结合起来,成功制备了苯硼酸官能团接枝的改性壳聚糖,随后将其与聚乙烯醇(PVA)通过pH值可控的层层自组装方法处理再生纤维素膜表面,得到力学强度明显改善的纤维素膜材料。结果表明:在pH为9.5,自组装30层高分子膜时,再生纤维素膜的拉伸强度与伸长率可提高38%和43%。处理后的再生纤维素膜达到了较为理想的力学性能增强效果,本方法对于纤维制品的性能改善有一定的应用价值。

Water-soluble coupling reagent N-（3-dimethylaminopropyl）-N＇ -ethylcarbodiimide hydrochloride （EDC） and N-hydroxysuccinimide （NHS） were used to graft 4-carboxyphenylboronic acid onto chitosan by generating amide bonds to prepare modified chitosan containing phenylboronic acid functional groups. Subsequently, both of the modified chitosan and poly（vinyl alcohol） （PVA） were used to treat the regenerated cellulose membrane surface through controllable layer-by-layer self-assembly to improve the mechanical strength. The results show that the mechanical strength of the regenerated cellulose membrane reaches the optimal enhancement effect. When the layer number of the polymer self-assembly film is 30 at pH 9.5, the tensile strength and tensile stretch of the regenerated cellulose membrane are improved by 38% and 43 %, respectively. Hence, the method mentioned has a potential application in modifying mechanical properties of fiber products.