in order to solve the low viscosity of direct polymerization polyoxalate glycol ester
polyester with high viscosity was synthesized by means of melt condensation polymerization and solid-phase condensation polymerization. Polyoxalate glycol ester was directly fused and condensed at 170℃ with stannum chloride catalyst. Solid phase polycondensation was performed at 125±2℃ for 40h. The characteristic viscosity increased to 0.236dl·g
-1
.The molecular structure was characterized by ir and NMR.DSC was used to characterize the crystallization temperature of solid phase polycondensation 10℃ higher than that of direct polymerization