“…Very recently, we have investigated the catalytic potential of several sources of commercially available lipases to polyesterification. 4 The optimal source of lipase and the optimal water content of the reaction system were determined. In our present work, by employing the same lipase, we compare the enzymatic polymerization of several lactones and study the effect of the microenvironment of lipase on polymerization of ε‐caprolactone.…”