聚氧化乙烯水溶液粘度行为的研究

Research of the Abnormal Viscosity Behavior of Poly(ethylene oxide) in Aqueous Solutions at Extremely Dilute Concentration

测定了40 ℃时不同分子量的聚氧化乙烯(PEO)水溶液的粘度,发现在低浓度区PEO水溶液比浓粘度出现负偏离.用高分子溶液流过时间对浓度作图的外推值t*0进行校正,则PEO水溶液的比浓粘度与浓度之间满足线性关系.利用高分子溶液流过时间t之前和之后纯溶剂的流过时间t0和t0′的改变确定了40 ℃时PEO在毛细管管壁上吸附层的厚度.

The viscosity of Poly(ethylene oxide)(PEO) in aqueous solutions at (40 ℃) was determined by using the Ubbelohde-type viscosimeter. It has been found that there existed a negative deviation from linear relationship at lower concentrations between the reduced viscosity and concentration. If t~*_0 obtained by extrapolating to zero concentration according to the relationship in the plots of the flow time of polymer solution versus concentration for PEO in aqueous solutions, was used to determine the viscosity of polymer solution, the linear relationship between the reduced viscosity and concentration was observed to exist. According to the changing the flow time of the pure solvent, namely t_0 and t_0′, obtained before and after the flow time of polymer solution, namely t, the thickness of the adsorbed polymer layers was determined at (40 ℃).