monomer addition methodology is provided to adjust monomer addition rates to a polymerization reactor . advantages of the invention include control of bioabsorbable copolymer structure , improvement of monomer conversion , control of reaction temperature , and reduced reaction time . the overall result is an improved process and enhanced product performance . the technology is particularly useful in the copolymerization of monomers with different reactivity ratios , such as glycolide / lactide copolymers and glycolide / caprolactone copolymers . monomer reactivity ratios and reaction kinetics are utilized to adjust monomer addition rates .