INTERPOLYMER ASSOCIATION BETWEEN RANDOM AND GRAFT ACRYLIC COPOLYMERS WITH POLY(ETHYLENE IMINE) - EFFECTS OF COPOLYMER STRUCTURE

Interpolymer complex formation has been studied between acrylamide-vin yl alcohol graft copolymer, methacrylic acid-acrylamide random copolym er and polyethylene imine. Some blends of binary homopolymer complexes having the same proportion of interacting units as in copolymer compl ex have also been prepared. Stability constant, degree of linkage and related thermodynamic parameters (e.g. Delta G degrees, Delta H degree s and Delta S degrees) have been compared for the two complexation sys tems using Osada's methods. The comparative study indicated considerab le difference in the values of these parameters, which has been explai ned on the basis of copolymer structure. (C) 1997 Elsevier Science Ltd .