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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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(a) Size exclusion chromatography (SEC) chromatograms of the samples made via the two-stage process; (b) The relative intensities of peaks P1/P5, P2/P5, P3/P5 and P4/P5 are compared to the blank sample UP2-O-0.