The polymerisations of l- and dl-lactic acid anhydrosulfite were conducted at room temperature in tetrahydrofuran with butyllithium as initiator. The polyesters obtained were analysed by gel permeation chromatography, both 1H and 13C NMR spectroscopy and also characterised by DSC. In all polymerisations, l-monomers led to highly crystalline isotactic polylactic acid, while dl-monomers produced amorphous polymers with randomly distributed l- and d- lactic acid units.
Посилання на статтю:
Polylactic acids produced from l- and dl-lactic acid anhydrosulfite: stereochemical aspects / A.J. Amass, K.L.R. NGoala, B.J. Tighe, F. Schué // Polymer. – 1999. – N 40. – P. 5073–5078.