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. 2021 Apr 13;13(8):1260. doi: 10.3390/polym13081260

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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 (https://creativecommons.org/licenses/by/4.0/).

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(a) Structures of isomeric BF-a monomers [152]. (b) Variation in tan δ of polybenzoxazines [152]. Copyright 2014. Reproduced with permission from American Chemical Society.