| 摘要 |
The present invention relates to absorbable block copolymers with improved characteristics including thermal stability, molecular weight consistency, inherent viscosity retention following melt extrusion, and fibers made from the polymers exhibit increased strength. The above objectives are accomplished according to the present invention by providing, in a first embodiment, an absorbable aliphatic polyester copolymer. The copolymer includes a polyaxial core, with at Ieast three axes, and a pre-polymer. The at Ieast three axes comprise polymeric chains. There is also at Ieast one flexible linking segment. Further, at Ieast one polymeric end graft is attached to each of the at Ieast three axes, the end graft comprising repeat units derived from at Ieast one cyclic monomer capable of crystallization. |
