pH可控PVAm-g-PBA/PVA层层自组装在纤维素膜上的应用

Application of pH controllable Layer-by-Layer Self-assembly of PVAm-g-PBA/PVA on Cellulose Membrane

摘要:

在水溶性偶联剂N-羟基琥珀酰亚胺（NHS）和N-（3-二甲氨基丙基）-N'-乙基碳二亚胺盐酸盐（EDC）的作用下，通过酰胺化反应将4-羧基苯硼酸（PBA）接枝到聚乙烯胺（PVAm）高分子链上，制得改性聚乙烯胺（PVAm-g-PBA），利用FTIR和1HNMR对其结构进行了表征。采用硅晶片和聚苯乙烯微球（PS）作为模拟物，将PVAm-g-PBA和聚乙烯醇（PVA）组装到其表面并研究了自组装过程中基材表面电荷的变化规律及自组装膜层厚度的变化。最后将PVAm-g-PBA与PVA通过pH可控的层层自组装方法处理再生纤维素膜表面，得到机械强度明显改善的纤维素膜材料。结果表明：PVAm-g-PBA的等电点为pH 7.9；在pH为9.5，与PVA组装上30层高分子膜时，再生纤维素膜的抗张强度与断裂伸长率分别提高了53%和76%。处理后的再生纤维素膜的机械性能得到了明显改善。

Abstract:

Water-soluble coupling reagent were used to graft 4-carboxyphenylboronic acid onto poly(vinyl amine) by generating amide bonds to prepare modified poly(vinyl amine) containing phenylboronic acid functional groups (PVAm-PBA). Subsequently, both of the modified poly(vinyl amine) 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 showed that the isoelectric point of PVAm-PBA was pH 7.9. When the layer number of the polymer self-assembly film was 30 at pH 9.5, the tensile strength and tensile stretch of the regenerated cellulose membrane improved 53% and 76%, respectively. Hence, the method mentioned in this paper has a potential application value in modifying the mechanical properties of fiber products.