EFFECT OF SOLVENT ON THE FORMATION OF STE REOCOMPLEXES IN POLY(METHYLMETHACRYLATE) SOLUTIONS

It was established that the thermodynamic quality of solvent plays a d ecisive role both in the kinetics of intermolecular contact formation between iso and syndio configurations of PMMA at the first moment upon mixing of the dilute solutions, and in the subsequent structure forma tion. The latter process may lead to either a tertiary structure with mobile linear fragments between network junctions (with improvement of the thermodynamic quality of solvent) or a two-strand structure (when thermodynamic quality of solvent become poorer). The solvent molecule s form hydrogen bonds with carbonyl groups of PMMA, thus hindering the formation of stereopoly complexes and even leading to their breakdown in thermodynamically poor solvents.