Titration Curves of p-Aminobenzoic Acid-Formaldehyde-p-Bromoaniline Copolymers in Nonaqueous Media

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Abstract
Copolymers obtained by condensation of p-aminobenzoic acid, p-bromoaniline, and formaldehyde in presence of acid catalyst have been separated into five fractions. Quantitative estimation of Br in each of the fractions was carried out, and the total amount of acidic and basic functional groups in given weight of the copolymer was calculated. Each of the fractions were titrated potentiometrically and conductometrically in nonaqueous solvents, and an excellent correlation was obtained for calculated and observed functional groups. The titration curves also indicated a series of breaks which bear an integral relation to each other. These features have been interpreted in terms of intramolecular hydrogen bonding, homoconjugation, and composition of the copolymers.