Abstract
The effect of the molecular weight of polymers having a certain number of hydrophilic groups on the adsorption behavior of such polymers onto magnetic particles was investigated. The materials studied were polymethylmethacrylate homopolymer [PMMA] and poly(methylmethacrylate-acrylic acid) copolymer [P(MMA-AA)], synthesized by radical polymerization. The competitive adsorption between two kinds of polymers having different molecular weights was examined. For PMMA, the lower molecular weight species adsorbed on γ-Fe 2O 3 rapidly at first, compared with the higher molecular weight species, but were later replaced by the higher molecular weight species. For P(MMA-AA), the lower molecular weight species adsorbed rapidly in a similar manner to PMMA, but the replacement did not occur. It is concluded that this difference in the adsorption behavior is due to the difference in the interaction between the γ-Fe 2O 3 surface and the two polymers.
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