聚氨酯稀溶液性质的研究——分级、分子量和分子量分布的表征

Study on the Properties of Dilute Solution of Polyesterurethane

以沉淀分级法和体积排斥色谱法(SEC)对聚酯型聚氨酯(PESU)进行了分级和分子量分布的表征,以气相渗透压(VPO)法和小角激光光散射法(SALS)测定了其绝对分子量((0)_w和()_());订定了30℃在二甲基甲酰胺(DMF)中的Mark-Houwinx方程式:[η]=1.61×10^(-4)M^1.36,并由粘度测定结果,讨论了此种高分子在强极性溶液中的分子形态.

The molecular weight and molecular weight distribution of a polyesterurethane (PESU) have been studid by means of prccipitation fraction, steric exclusion chromatograph (SEC), vapor pressure osmometry (VPO) and small angle light scattering (SALS). The mark-houwink equation for PESU in DMF at 30℃ has been found to be[η]=1.61×10^(-4)M^1.36 for fractionated samples with a molecular weight rang of 6.5×10~3～1.75×10~4. The parameter a of Mark-Ifouwink equation and the macromolecular morphology in solution are disscussed.