The synthesis reaction of Fig. 1 was carried out in a 50 mL flask, immersed in a controlled temperature oil bath. In each polymerization, predetermined amounts of LA and ε-CL were simultaneously added and melted. The flask was purged for 30 min with a nitrogen stream under the surface of the melt. Then, the stannous octoate was added using a 2000:1 comonomers:catalyst molar ratio. The magnetic stirrer was maintained at 100 rpm. After 24 h of reaction, the product was dissolved in chloroform and precipitated pouring the polymer solution into excess of methanol in order to remove the catalyst impurities and the monomers that did not react. Finally, the product was dried at 45 °C under vacuum until it reached constant weight.