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. 2021 Apr 16;12:2297. doi: 10.1038/s41467-021-22609-y

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© The Author(s) 2021

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.

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Fig. 4 — a Hydrogen bonding interactions between SDP and SDP, SDP and PVA, and PVA and PVA in unirradiated SDP-based film. b Covalent bond (C–O–C) formation between PVA chains after 254 nm UV light irradiation for <45 min. c Rearrangement of hydrogen bonding interactions, and further formation of covalent bond (C–O–C) after irradiation for more than 45 min. d ¹H NMR spectra of SDP-based film (1 mg/mL) in DMSO-d₆ recorded after different irradiation times. e Electron paramagnetic resonance spectra and f one-dimentional scattering profiles in the q_z direction of GiWAXS pattern for SDP-based film (0.3 mg/mL) recorded after different irradiation times.