A six-member cyclic carbonate with protected functional groups was synthesized from tetramethylolmethane

benzaldehyde and ethyl choroformate．Coplymerization of D

L-lactide with cyclic carbonate was carried out throush conventional ring-opening polymerization using Sn(Oct)2 as the catalyst．The effects of different catalysts

polymerization time and monomer-to-catalyst molar ratio on the molecular weight were investigated．The methods of removing protected groups were studied．Results showed the protected groups were effectively removed via catalytic hydrogenation．Poly(D

L-lactide-co—cycliccarbonate)s with hydroxyl pendant functional groups was obtained．