[en] The influence of methyl substituent on the mechanism of the ring-opening polymerization of -lactones initiated by alkali metal alkoxides is discussed. Attention has been paid to the effect of the substituent position in the monomer molecule on the ring-opening mechanism, the 3,3-dimethyl-2-oxetanone (pivalolactone), 4-methyl-2-oxetanone (beta-butyrolactone) and 2-oxetanone (beta-propiolactone) being chosen as model monomers. Moreover, it was found unexpectedly that in the case of pivalolactone polymerization, besides open-chain polymers, cyclic oligomers are produced.
Center for Education and Research on Macromolecules (CERM)
State Committee for Scientific Research, Grant No. 2 08769101 ; The Polish Academy of Sciences ; Fonds de la Recherche Scientifique (Communauté française de Belgique) - F.R.S.-FNRS