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. 2024 May 2;29(9):2099. doi: 10.3390/molecules29092099

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© 2024 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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UV-Visible absorption spectrum of polyurethane with different materials. (Pure polyurethane: unmodified polyurethane; addition of disulfides only: polyurethane modified with a ratio of 3:2 of BDO to 2-hydroxyethyl disulfide; UV absorber only: polyurethane modified with a 3% content of UV absorber; addition of disulfide compounds and UV absorbers: polyurethane modified with a ratio of 3:2 of BDO to 2-hydroxyethyl disulfide along with a 3% content of UV absorber. For specific modification methods, please refer to Section 3.2.2).