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. 2018 May 23;10(6):577. doi: 10.3390/polym10060577

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© 2018 by the authors.

Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).

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Scheme 3 — Synthesis of c-PCL from CL: (a) linear PCL and its cyclization using a rotaxane [10]; (b) zwitterionic polymerization of CL [20,21,22]; (c) linear PCL and its cyclic amidation [23].