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. 2019 Mar 11;11(3):458. doi: 10.3390/polym11030458

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© 2019 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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SEM image (a) and particle size histogram (e) of the surface of RC; SEM images and particle size histograms of the surface of RC-0.1 (b,f); RC-0.2 (c,g); RC-0.5 (d,h) and the cross-section of RC-0.1 (i,l); RC-0.2 (j,m); RC-0.5 (k,n).