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. 2017 May 21;9(5):184. doi: 10.3390/polym9050184

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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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The appearance of samples made in two-stage processing: (a) di-PPG chain extended samples compared with the blank sample UP1-O-0; (b) pentanediol chain extended samples compared with the blank sample UP1-O-0; (c) samples with a 0.74 molar ratio of different chain extenders.