Complex formation between linear and cross-linked vinyl isobutyl ether-acrylic acid copolymers and poly(ethylene glycol vinyl ether)

Complex formation between linear and cross-linked vinyl isobutyl ether-acrylic acid copolymers and poly(ethylene glycol vinyl ether) was studied. It was shown that depending on the pH of a medium complex formation in the hydrogel-linear polymer solution system is accompanied either by swelling or contraction of the network. The critical pH values of complex formation were determined.