Studies on the Electrochemical Properties of Copolymers of Maleic Acid，III On the Difference of Titration Behaviors due to Comonomer Species

摘要

The sharp difference of titration behaviors between maleic acid-vinyl acetate copolymerand maleic acid-styrene copolymer was briefly considered according to the Kirkwood modelfor organic ionsOn the other hand，the electrostatic potential of polyion with which the coil configurationwas related， was estimated from the potentiometric data at low ionic strength and thecomparison between two copolymers in various polymer concentrations was done. During thedissociation of the primary carboxyl group， the potential curves as the function of the degreeof ionization markedly differed between two copolymers. In particular，the anomalous behaviorof the styrene copolymer was considered to come from its tighter coiling.In addition， the independency of titration curves of the degree of polymerization wasascertained in two copolymers.