水性聚氨酯电导率与聚沉值的研究

研究了软（硬）段含羧基的水性阴离子纳米聚氨酯体系的n(NCO)/n(OH)比值，COOH的质量分类，反离子各类，合成方法与电导率关系及产生的原因；探讨了该体系的n(NCO)/n(OH)值，COOH的质量分数，合成方法与临界聚沉值（Cc.c)的关系和规律。并分析，比较了软（硬）段含羧基的水性阴离子聚氨酯体系电导率与Cc.c二者关系，得出了随COOH的质量分数升高，二者变化相同，随n(NCO)/n(OH)比值升高,二者变化相反的结论。

The Investigation on Conductivity and Critical Congregating Con centation of WPU

In the paper, waterborne anionic polyurethane (WPU) with ions in soft and hard segment was synthesized by using isophorore diisocyanate(IPDI), dimethylolpropanoic acid(DMBA)and 2-propanol. Consequently, the relation of the NCO/OH molar ratio, carboxyl content, the type of counter ions, prepared method to conductivity was studied. Furthermore, regular and relation of NCO/OH ratio, carboxyl content, the type of counter ions, prepared method to critical congregating concentration (C c.c) were investigated. In the meanwhile, by comparing conductivity with C c.c of WPU system with soft segment containing carboxyl, it was concluded that with the increasing of carboxyl content, both changed in the same trend, but with the increasing of the NCO/OH ratio, both varied in contrary trend.