MICROSTRUCTURAL ANALYSIS OF METHYL-METHACRYLATE LAURYL METHACRYLATE COPOLYMERS USING C-13 NMR-SPECTROSCOPY

C-13 NMR spectra (75.5 MHz) of methyl methacrylate (M)-lauryl methacry late (L) copolymers prepared by group transfer polymerization (GTP) we re analyzed far sequence distribution and relative stereochemical conf iguration of monomer units along the macromolecular chains. The concen trations of M- and L-centered triads, determined experimentally from a lpha-CH3 and C = O resonance signals, were in good agreement with thos e calculated statistically, taking into consideration the terminal cop olymerization model and Bernoullian distribution of stereoregularity, with the statistical parameters P-ij determined from the reflectivity ratios r(M) = 1.38 +/- 0.11 and r(L) = 0.68 +/- 0.10 and the coisotact icity parameters sigma(MM) = 0.24, sigma(LL) = 0.27,sigma(ML) = sigma( LM) = sigma = 0.30.