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. 2017 Dec 29;10(2):31. doi: 10.1007/s40820-017-0184-y

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© The Author(s) 2017

Open AccessThis article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made.

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Fig. 1 — Photocrosslinking mechanism of PEGDA. a UV-induced dissociation of photoinitiator to generate free radicals. b Propagation step, where free radical attacks the double bond in PEGDA to form new radicals. c Chain transfer. d Different combinations of free radicals to form stable, inactive products, thereby leading to chain termination [1]