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The sorption of some substituted benzoic acid derivatives by polyamides (nylons) from aqueous solution has been examined and the influence of their nature together with those of the cosolvent and polymer have been assessed. In all cases the sorption isotherms were linear and could be expressed by a simple distribution law, enabling the influence of cosolvent concentration to be predicted. The sorption of a series of p-substituted benzoic acids and some of their esters is related to their solubility except where the p-substituent is capable of hydrogen-bonding with the polymer. The extent of the interaction is also dependent upon the amide frequency of the polymer.
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Richardson et al. (1975) studied this question.
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