Direct melting polycondensation and characterization of poly(ε-caprolactone-co-lactic acid)

摘要

A kind of biodegradable material,poly(ε-caprolactone-co-lactic acid) [P(CL-co-LA)] was synthesized via the direct melting polycondensation of lactic acid (LA)and ε-caprolactone (CL).The influences of the polycondensation time,and the catalyst type on the intrinsic viscosity of P(CL-co-LA) were also investigated.The results indicate that P(CL-co-dl-LA),with an intrinsic viscosity of 0.4733 dL/g,can be prepared by direct melting polycondensation with the molar ratio LA/CL = 3:7 at 180℃ and 70 Pa for 12 h,using 0.5% (mass fraction) of SnCI2 as the catalyst.Compared with lactide ring-opening polycondensation (ROP),the direct melting polycondensation of LA and CL is more practicable and simple.