Abstract
Three samples of poly(2-ethylacrylic acid) (PEAA) of different molecular weights (M_w = 164000, 43000, and 12000) were prepared by radical polymerization of 2-ethylacrylic acid in bulk. The conformational properties of the samples were determined and correlated with the pH-dependent structural reorganization observed in phosphatidylcholine vesicles suspended in the respective polymer solutions. In all experiments the sample of lowest molecular weight behaved differently from the other two: The cooperativity of the conformational transition was reduced and the transition midpoint was shifted to lower pH as compared to the samples of higher molecular weight. These effects of polymer molecular weight were reflected in the behavior of the vesicle-to-micelle transition observed upon acidification of aqueous mixtures of PEAA and dipalmitoylphosphatidylcholine.
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