Journal of the American Chemical Society p. 6270 - 6276 (1986)
Update date:2022-08-17
Topics:
Chu, Deh-ying
Thomas, J. K.
The interaction between poly(methacrylic acid) and alkyltrimethylammonium bromide, CnTAB, cationic surfactants has been investigated in aqueous solutions of pH 8, by use of the photophysics of pyrene and its derivatives.Photophysical studies of these fluorescent probes, both steady-state and pulsed laser studies, show that a conformational transition of PMA is induced by CnTAB.The surfactant induces a coiling up of PMA chains at pH 8, which takes place via a cooperative process.This effect takes places when the concentration of CnTAB is above a critical aggregate concentration, CAC.The CAC is 1 or 2 orders of magnitude less than the cmc of the corresponding micelle.There is a significant effect of surfactant chain length and PMA concentration on the CAC, which provides information on the nature of the CAC and the mechanism of the PMA transition.A model is suggested for the aggregation of PMA-C10TAB based on experimental data.Studies show that the aggregate consists of about 100 C10TAB molecules and 1 coiled polymer chain.
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