粘度法研究壳聚糖与两性聚氨酯胶束间的相互作用

通过粘度法考察了壳聚糖(CS)在盐酸水溶液中与表面带有正电荷的两性聚氨酯(APU)胶束的相互作用，并研究了小分子盐浓度、pH及不同混合方式对复合体系粘度的影响．结果表明：在壳聚糖／APU盐酸混合体系中，较高浓度下APU胶束与壳聚糖分子间的静电斥力作用导致壳聚糖大分子链的伸展，使体系粘度提高，同时降低了壳聚糖溶液对电解质、pH的敏感性；不同混合过程导致壳聚糖大分子构像及其与APU组装、复合形态有很大差别，使混合体系流变性表现出明显的不同．

RHEOLOGICAL PROPERTIES OF CHITOSAN AND AMPHOTERIC POLYURETHANE MICELLE COMPOSITES

The interaction between chitosan macromolecules and amphoteric polyurethane (APU) micelles with positive charges on the surface in HCl aqueous solutions was studied by viscosity method. The effect of salt concentration, pH value and the mixing manners on the viscosity also was studied. The studying results indicate that the static electric repulse interaction between APU micelles and chitosan macromolecules leads to the more stretched conformation of chitosan macromolecules, which increases the viscosity of chitosan solutions and decreases the viscosity dependence of chitosan solutions on salt concentration and pH values of the media. The solid/solid, solution/solution and solid/solution mixing manners of chitosan and APU formed different macromolecular conformations of chitosan, different assembling or complexing structure between chitosan and APU, and as a result, the formed CS/APU composites at the same component but different mixing manners presented significantly rheological difference.