Abstract
The potentiometric titration curve of poly(crotonic acid) was compared with that of poly(methacrylic acid). Poly(crotonic acid) is a far weaker acid than poly(methacrylic acid), despite the fact that the conformation of poly(crotonic acid) is a random coil, similar to that of poly(methacrylic acid). This difference is ascribed to their difference in the relative position of the methyl group to the carboxyl group. The methyl group in poly(crotonic acid) intervenes between two adjacent carboxyl groups, leading to the decrease in the local dielectric constant effective for ionization of carboxyl groups.
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Muroga, Y., Nagasawa, M. Potentiometric Titration Behavior of Poly(crotonic acid). Polym J 18, 15–19 (1986). https://doi.org/10.1295/polymj.18.15
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DOI: https://doi.org/10.1295/polymj.18.15