水性聚氨酯电导率与聚沉值的研究

The Investigation on Conductivity and Critical Congregating Concentation of WPU

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的质量分数、反离子种类、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。

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.