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. 2021 Feb 21;13(4):643. doi: 10.3390/polym13040643

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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/).

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FTIR (Fourier transform infrared) spectra (a) Organosolv lignin-PEO (polyethylene oxide) (OLPO) composite in comparison to PEO (PO) and blank organosolv lignin (OL), (b) comparison of OLPO and OL to demonstrate shift in peak in the range of 3000–4000 cm⁻¹, (c) Kraft lignin-PEO (KLPO) composite in comparison to PEO (PO) and blank kraft lignin (KL), (d) comparison of KLPO and KL to demonstrate shift in peak in the range of 3000–4000 cm⁻¹.