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测定了25℃时活性炭自水溶液中吸附五种聚乙二醇(PEG)、一种聚丙二醇(PPG)和三种环氧乙烷(EO)-环氧丙烷(PO)嵌段共聚物的吸附等温线。结果表明,各等温线均为Langmuir型的,且在较低浓度时即可达极限吸附。当以g.g~(-1)表示吸附量时,各聚合物的极限吸附量相近。对于PEG系列和EO-PO嵌段共聚物系列,极限吸附时每个分子占据的面积与分子中所含EO数的关系为两条斜率相同的直线。由直线斜率和后一直线的截距可求得每个EO和PO所占的面积分别为26和29(?)~2。这些结果支持了分子以其EO和PO链节都平躺在表面上的吸附模型。
The adsorption of five kinds of polyethylene glycol (PEG), one kind of polypropylene glycol (PPG) and three kinds of ethylene oxide (EO) -propylene oxide (PO) block copolymer on activated carbon from aqueous solution was measured at 25 ℃. Isotherm. The results showed that each isotherm was Langmuir-type, and at lower concentrations up to the limit of adsorption. When g.g ~ (-1) indicates the amount of adsorption, the limit of adsorption of each polymer is similar. For the PEG series and the EO-PO block copolymer series, the area occupied by each molecule at the extreme adsorption depends on the number of EO molecules contained in the molecule as two straight lines of the same slope. The area occupied by each EO and PO can be calculated as 26 and 29 (?) ~ 2, respectively, from the slope of the line and the intercept of the latter line. These results support the adsorption model in which molecules lay on the surface with both their EO and PO chains.