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. 2021 May 13;13(10):1565. doi: 10.3390/polym13101565

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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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Sound absorption coefficient (A) and sound reflection coefficient (B) as a function of frequency for NR/NC/NCB hybrid nanocomposite foams with different NC content [161].