Glycidol (2-epoxy-1 -propanoi) was polymerized under the action of Lewis acids (BF,OEt,, SnCI,) and protonic acids (CF,COOH, CF,SO,H). Polymers with number-average molecular weights (a,) varying from 2500 to 6000 g/mol were obtained. The structure of obtained polymers was characterized by I3C and "Si NMR spectroscopy, and the amount of 1-3 units, 1-4 units and chain branches was determined. The structure of the polymers was related to the polymerization mechanism, especially to the contribution of activated monomer mechanism in chain growth.

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The anionic polymerization of L-lactide in the presence of the sodium poly(ethy1ene g1ycol)ate in tetrahydrofuran at 25 "C yields "tailored" ABA triblock copolymers having the expected compositions and molecular weights. During the polymerization, a slight racemization of L-lactide was observed. The water absorption experiments indicate that the introduction of the poly(ethy1ene glycol) block into the L-lactide polymer chain markedly increases its hydrophilicity. It was revealed that the morphology and mechanical properties of block copolymers depend strongly on their composition and thermal treatment.