壳聚糖-两性聚氨酯接枝共聚物的制备

Preparation of Poly(chitosan-co-polyurethan)

利用壳聚糖大分子链上的— OH和— NH2 基团与两性聚氨酯预聚体的端— NCO基团反应 ,把两性聚氨酯链接枝到壳聚糖分子链上 ,为聚电解质及纳米胶体粒子间的组装、复合性质的研究提供模型化合物 .红外光谱、热分析方法初步研究表明 ,采用上述方法能够制备出 APU-壳聚糖接枝共聚物 ,但产物是壳聚糖与接枝共聚物的混合物 .研究发现 ,这种接枝共聚物在盐酸水溶液中呈胶束形态 。

An amphoteric polyurethane(APU) with both acid and base pendent groups was synthesized and a graft copolymer was obtained by reacting its NCO end group with OH and/or NH 2 groups of the chitosan molecules in dilute HCl solution. The IR and DSC results indicated the occurence of hydrogen bonding in the copolymer. The graft copolymer in HCl solution appeared to be a dispersion with special rheological property.