Three kinds of random copolymer P(LLA-CL) rods were prepared by one-step ring-opening polymerizing molding from the L-lactide and
ε
-caprolactone with low toxicity stannous octoate as catalyst
and PTFE tubes were used as mould. The properties of copolymer rods were analyzed by
1
H nuclear magnetic resonance
infrared spectrum
differential scanning calorimeter and thermogravimetric analyzer. Scanning electron microscopy was used to observe the micromorphology of the brittle fracture section of the copolymer rods. The results showed that the synthesized polymers were random copolymers
the copolymerization ratio was close to the feed ratio. Changing the content of
ε
-caprolactone could change the crystalline morphology and adjust the mechanical properties of copolymer. The results are valuable for the application of copolymer P(LLA-CL) in medical devices.