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. 2020 Jul 16;10:11727. doi: 10.1038/s41598-020-68678-9

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© The Author(s) 2020

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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Mechanical properties of the hydrogels. (a) Photographs of a hydrogel before and after stretching (v = 25 mm/min). Edit by WPS Office with the version 11.1.0.9513. https://pc.wps.cn/ (b) Tensile stress curves of the hydrogels prepared with different DMAA to AAc molar ratios. (c) Stress–strain curves of hydrogel D50A50U0.2 stretched at different speeds (v = 50, 100, 200, 400 mm/min). (d) Stress–strain curves of the hydrogel (R_DMAA/AAc = 50/50) prepared with different UPy molar ratios (c = 0, 0.2%, 0.4%, 0.8%).