Adsorption of monodisperse polystyrene onto porous glass. I. preference adsorption and displacement of high-molecular-weight species

• Published in: Journal of colloid and interface science 1982-03, Vol.86 (1), p.35-42
• Main Authors: Furusawa, Kunio, Yamashita, Kyogo, Konno, Kazuhiko
• Format: Article
• Language: English
• ISSN: 0021-9797; 1095-7103
• DOI: 10.1016/0021-9797(82)90038-8

The effect of the molecular weight of a polymer on the maximum adsorption, the adsorption rate, the competitive adsorption of two or three species simultaneously, and the displacement process of adsorbed polymer was measured at the theta condition of the solution using polystyrene samples of narrow molecular weight distribution. The analyses for these measurements were carried out quantitatively by the gel permeation chromatography technique. It is apparent that the preferential adsorption of large-sized molecules over small ones can be detected in many kinds of adsorption, but the preferential adsorption is not very pronounced and is greatly dependent on the concentration of each component at which the corresponding adsorption is carried out. These effects could be explained mainly by the difference of the adsorption/desorption rate of the small component, because at the beginning the adsorption layer of the mixture is occupied entirely by the small-sized component due to its rapid adsorption rate.