Anionische lösungspolymerisation von glycolid

Abstract

SUMMARY:The anionic solution polymerization of glycolid yielding polyglycolic acid was examined with several solvent-initiator-systems. The polymerization behaviour in toluene using the tertiary amines triethylamine and N,N-dimethylbemylamine as initiators and in sulfolan (tetrahydrothiophenedoxide) with N,N-dimethylbenzylamine is described in dependence on initiator concentration and reaction time.

Application of Calcium Acetylacetonate to the Polymerization of Glycolide and Copolymerization of Glycolide with ε-Caprolactone andl-Lactide

“…Kricheldorf performed the copolymerization of glycolide with ε-caprolactone in the presence of iron compounds . Brown et al polymerized glycolide using a series of typical anionic initiators in solution of sulfolane at 120 °C to afford low molecular weight polymers …”

“…Kricheldorf performed the copolymerization of glycolide with -caprolactone in the presence of iron compounds. 18 Brown et al 19 polymerized glycolide using a series of typical anionic initiators in solution of sulfolane at 120 °C to afford low molecular weight polymers. 19 With the use of typical nonmetallic anionic initiators for the copolymerization of glycolide with -caprolactone, only homopolymerization of glycolide was found to occur.…”

“…18 Brown et al 19 polymerized glycolide using a series of typical anionic initiators in solution of sulfolane at 120 °C to afford low molecular weight polymers. 19 With the use of typical nonmetallic anionic initiators for the copolymerization of glycolide with -caprolactone, only homopolymerization of glycolide was found to occur. 18 So far, calcium compounds, such as calcium carbonate or calcium oxide 20 have been used exclusively to polymerize lactide.…”

“…A possibility of obtaining homopolymers of glycolide with high molecular weights, as well as random copolymers of glycolide with caprolactone, clearly shows the process described by us to differ considerably from the typical anionic polymerization reported in earlier works. 18,19…”