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. 2017 Apr 5;9(4):130. doi: 10.3390/polym9040130

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© 2017 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 5 — Polyaddition reaction of PEG-Diamine to thiolactone-lactone coupler (1) in the presence of methyl acrylate. Products were synthesized in various concentrations of 1 in DMF (4a: 0.5 M; 4b: 1.0 M; 4c: 1.5 M) and in bulk (4d).