to begin polymerization the reaction was stirred for approximately 4 5 hours at 130 135 u00b0 c followed by continued polymerization at 135 u00b0 c for 60 70 hours without stirring the reaction flask contents were allowed to cool to room temperature and the polymer was isolated samples of the isolated polymer were analyzed for molecular weight identity and thermal properties using standard gpc ir and dsc protocols respectively the radiopaque lactide glycolide copolymer initiated with 3 iodo 1 propanol 3 05 u00d7 10 u2212 3 mol 50 1 grams was added to a flame dried reaction kettle fitted with a mechanical stirrer a distillation neck and a collection flask the polymer was dissolved in dichloromethane 0 5 g ml and mixed thoroughly with the mechanical stirrer at room temperature then 1 6 diisocyanatohexane i 527 u00d7 10 u2212 3 moles 0 257 grams was added to the reaction 1 mole of 1 6 diisocyanatohexane per 2 moles polymer and the temperature was increased to 150 u00b0 c for 1 2 hours to react and to distill off the solvent upon cooling to room temperature the resulting linked polymer was dissolved in dichloromethane 25 wt vol and 5 milliliters of isopropyl alcohol was added to the solution to quench any unreacted 1 6 diisocyanatohexane subsequently the solution was precipitated in chilled isopropyl alcohol and filtered the purified polymer was then dried at room temperature and reduced pressure samples of the isolated polymer were isolated and analyzed for molecular weight identity and thermal properties using standard gpc ir and dsc protocols respectively films were prepared by a solvent casting technique by first dissolving pi 1 in a mixture of 1 1 dichloromethane chloroform.