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. 2021 Jan 20;13(3):320. doi: 10.3390/polym13030320

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© 2021 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/).

PMC Copyright notice

Schematic diagram of the stages of crack propagation in NR particles modified epoxy resins: (a) the notched sample, (b) the crack extends, (c) the crack propagates future. Reused with permission from Ref. [52]. Copyright 2013 Elsevier.