STUDY OF THE PROPAGATION CENTER IN THE ANIONIC-POLYMERIZATION OF LACTAMS .1. SPECTROSCOPIC AND THEORETICAL-STUDY OF THE ACTIVATED MONOMER IN DIMETHYL-SULFOXIDE

Solutions of Li, Na and K salts of 3,3-dimethyl-2-piperidone and epsil on-caprolactam in dimethyl sulfoxide-d(6) were studied by Li-6, Li-7, Na-23, H-1 and C-13 NMR, Raman spectroscopy and MNDO molecular orbital calculations. Using NMR relaxation, the dynamics and equilibrium stat es of solvation, dissociation and cation exchange were clarified. At c oncentrations above 0,1 mol/L, molecular aggregation to a dimer and po ssibly higher aggregates has been found.