The introduction of functional pendant groups to biodegradable polyesters would be a highly efficient way of improving the properties of polyesters such as hydrophilicity

biodegradation rates

bioadhesion

drug loading

etc．A functional monomer with protected hydroxy group 4-benzyloxymethyl-1

3-dioxolan-2-one

which can also be named 3-benzyloxy-1

2-propanediolcyclic carbonate(BPC)

was synthesized by reaction of bis(trichdomethyl)carbonate (BTC)with 3-phenylmethoxymethly-1

2-propanediol

which was easily obtained from the reaction of 3-chloro-1

2- propanediol and sodium phenylmethanolate．Homo—and copolymerlzation of BPC was carried out in bulk using stannous octanoate as a catalyst under different conditions．The properties of the BPC hornopolymers and copolymers with lactide were studied．The copolymerization of BPC and DL—lactide was successfully carried out．The resulting polymer was deprotected by Pd／C catalytic hydrogenation．The hydrophilicity of the deprotected copolymers demonstrated by water contact angle measurements was greatly improved．