【摘要】 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。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。结果表明:PVAm-g-PBA的等电点为pH=7.9;在p H=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。更多还原

【Abstract】 The grafting 4-carboxylic phenylboric acid(PBA) onto the polyvinylamine(PVAm) polymer chain by amination reaction was conducted to prepare modified polyvinylamine PVAm-g-PBA. FTIR and 1HNMR were used to characterize the structure of PVAm-g-PBA. Afterwards, PVAm-g-PBA and polyvinyl alcohol(PVA) were assembled on the surface of mimics(silicon wafers and polystyrene microspheres), and the change in the surface charge of the substrate and the thickness of the self-assembled film during the self-assembly process were studied. Subsequently, both of the modified polyvinylamine and polyvinyl alcohol were used to treat the regenerated cellulose membrane surface through pH controllable layer-by-layer self-assembly to improve the mechanical elongation. The results showed that the isoelectric point of PVAm-g-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 by 53% and 76%, respectively. The mechanical properties of the treated regenerated cellulose membrane were significantly improved.更多还原