. 2018 Oct 26;10(11):1193. doi: 10.3390/polym10111193
© 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/).
Figure 6.
Charge characteristic of expression products.