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Research Article | Open Access

Synthesis of Lignin-based Non-isocyanate Poly(imine-hydroxyurethane)s Networks. Part Ⅱ: Self-healing, Reprocessing, and Degradation

Chao Shen1Bailiang Xue1,2( )Danwei Xue1Rui Tang1Wei Zhao1Xinping Li1
College of Bioresources Chemical and Materials Engineering, Shaanxi University of Science and Technology, Xi'an, Shaanxi Province, 710021, China
Key Laboratory of Pulp and Paper Science & Technology of Ministry of Education, Qilu University of Technology (Shandong Academy of Sciences), Ji'nan, Shandong Provice, 250353, China
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Abstract

This study provides a comprehensive understanding of the polymeric properties of lignin-based non-isocyanate poly(imine-hydroxyurethane)s (LNIPUs). The properties of the LNIPUs are affected by changes in the stoichiometric feed ratios of the bis(6-membered cyclic carbonate) (BCC) and levulinate enzymatic hydrolysis lignin (LEHL). The results showed that the LNIPUs exhibited a short relaxation time and excellent thermal repair and degradation properties. With a change in the LEHL content in the LNIPUs to 45.53%, a relaxation time of only 9 s was achieved, and the thermal repair rate of the scratches reached 93%. Furthermore, the tensile strength of the LNIPUs decreased with an increase in the LEHL content after two hot-pressing processes, while a higher than 75% tensile strength was maintained after the second hot-pressing treatment. The LNIPUs exhibited thermoresponsive shape memory property with deformation and shape fixing at 80℃. In addition, the as-synthesized LNIPUs were soluble in ethylene glycol in the absence of any organic solvents. This work demonstrates the synthesis of LNIPUs with self-healing, reprocessing, shape memory, and degradation properties.

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Paper and Biomaterials
Pages 1-9
Cite this article:
Shen C, Xue B, Xue D, et al. Synthesis of Lignin-based Non-isocyanate Poly(imine-hydroxyurethane)s Networks. Part Ⅱ: Self-healing, Reprocessing, and Degradation. Paper and Biomaterials, 2021, 6(3): 1-9. https://doi.org/10.1213/j.issn.2096-2355.2021.03.001

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Received: 31 March 2021
Accepted: 29 April 2021
Published: 25 July 2021
© 2021 Paper and Biomaterials

This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/)

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