| 摘要 |
PURPOSE: A star-shaped glycolide/epsilon-caprolactone co-polymer and a preparation method thereof are provided, which has a weight average molecular weight over 30,000 and a low melting viscosity. CONSTITUTION: A preparation method of star-shaped biodegradable glycolide/epsilon-caprolactone co-polymer of formula 1 comprises: in the presence of ring-opening polymerization catalyst of glycolide/epsilon-caprolactone, performing a ring-opening polymerization by heating glycolide and epsilon-caprolactone through using polyhydric alcohol as polymerization initiator under vacuum pressure. The polyhydric alcohol is selected from the group of glycerol, penta-erythritol, di-penta-erythritol, tri-penta-erythritol, sorbitol, poly-vinyl alcohol, poly-hydroxy ethyl methacrylate, and poly-hydroxy propyl methacrylate. The catalyst is selected from the group of tetra-phenyl tin, tin powder, stannous octoate, tin chloride, tin oxide, zinc powder, di-ethyl zinc octoate, zinc chloride, and zinc oxide.
|
