Abstract: Biodegradable polymers are described comprising the recurring monomeric units shown in formula I: ##STR1## wherein: R is selected from the group consisting of H, alkyl, aryl or heterocyclic; andR' is selected from the group consisting of H, alkyl, alkoxy, aryl, aryloxy, heterocyclic or heterocycloxy; andn is 5 to 500,wherein said biodegradable polymer is biocompatible before and upon biodegradation.Processes for preparing the polymers, compositions containing the polymers and biologically active substances, articles useful for implantation or injection into the body fabricated from the compositions, and methods for controllably releasing biologically active substances using the polymers, are also described.