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

作者：Chao Shen; Bailiang Xue^*; Danwei Xue; Rui Tang; Wei Zhao; Xinping Li

来源：造纸与生物质材料(英文), 2021, 6(03): 1-9.

DOI：10.1213/j.issn.2096-2355.2021.03.001

• lignin
• non-isocyanate polyurethane
• self-healing
• reprocessing

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 9s 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.

• 单位
  齐鲁工业大学