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测定了不同分子量聚氧化乙烯 (PEO)在水溶液中的粘度 ,发现在低浓度区高分子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 重新计算相对粘度 ,则高分子溶液比浓粘度与浓度之间满足线性关系。不同分子量PEO水溶液流过时间对浓度作图的外推值t 0 是完全一致的。利用纯溶剂在粘度计中流过时间的改变确定了高分子在毛细管管壁上吸附层的厚度 ,发现PEO在毛细管管壁上吸附层厚度与分子量无关
The viscosity of polyethylene oxide (PEO) with different molecular weight in aqueous solution was measured and it was found that there was a negative deviation in the reduced viscosity of the polymer solution at low concentration. With the polymer solution flow through the time plot of the extrapolated value of t0 recalculate the relative viscosity, then the polymer solution viscosity and concentration to meet a linear relationship between concentration. The extrapolated value t 0 of the flow-through times of different molecular weight PEO solutions is exactly the same. The change of the flowing time of the pure solvent in the viscometer determined the thickness of the polymer adsorption layer on the wall of the capillary tube and found that the thickness of the adsorption layer on the wall of the capillary tube was not related to the molecular weight