Preparation and Property Analysis of Poly(ε-caprolactone)-Poly(ethylene glycol)-Poly(ε-caprolactone)/Polylactide Blends

To broaden the application of polylactide(PLA) in biomedical field,initiator PEG-2000 modified by titanium isopropoxide was introduced to the ring opening polymerization of caprolactone.A biodegradable triblock poly(ε-caprolactone)-poly(ethylene glycol)-poly(ε-caprolactone) (PCEC) was synthesized.The morphology,crystallization and tensile properties of PCEC/PLA blends with varied concentration of PCEC were investigated by comparison with PEG-6000/PLA blends.The SEM images show that PCEC/PLA blends exhibit a typical sea-island morphology with PCEC finely dispersed in PLA matrix as droplets.The crystallization ability of PLA in PCEC/PLA blends is weaker than PLA in PEG-6000/PLA.When the mass ratio of additive and PLA is 15:85,the elongation at break of PEG-6000/PLA blend is 7% higher than PCEC/PLA while the tensile strength is 50% lower.