Abstract
Abstract The films of polyacids (poly-l-glutamic acid and the copolymer of maleic acid and vinyl acetate) and some related compounds were studied in order to know the behaviour of carboxyl groups in the linear polymer at the interface. The principal results obtained are as follows. The orientation of carboxyl group is affected considerably by other accompanying groups in polymer. Hence, the surface moment of carboxylic compounds is various according to the surface orientation of respective groups in the polymer. Accordingly, the surface moment of copolymer cannot be explained by the simple additivity of the moment of constituent polar groups. The surface moment of polyacids abruptly decreases nearly at the pH of aqueous phase equal to the pK of corresponding structural unit.
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