Adsorption of Polystyrene-block-poly(2-cinnamoylethyl methacrylate) by Silica from Block-Selective Solvent Mixtures
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Abstract
Polystyrene-block-poly(2-cinnamoylethyl methacrylate) (PS-b-PCEMA) of different block lengths have been synthesized. These polymers were adsorbed via the anchoring of the insoluble PCEMA block on silica, in the brush conformation, from cyclohexane/THF or cyclopentane/THF mixtures when cyclohexane or cyclopentane contents were high. The adsorbed amount could be increased or decreased by increasing or decreasing the cyclohexane or cyclopentane content. In a given solvent mixture, number surface coverages ρ∞ increased as n/m decreased, where n and m are the numbers of repeat units for the PS and PCEMA blocks, respectively. The trend that ρ∞ increased with decreasing n/m is contradictory to previous experimental observations but can be well explained by the scaling relation derived by Marques et al. for block copolymer adsorption from a micellar solution in the buoy-dominated regime.
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