Synthesis of Lignin-based Nonisocyanate 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 

机构地区：[1]College of Bioresources Chemical and Materials Engineering,Shaanxi University of Science and Technology,Xi'an,Shaanxi Province,710021,China [2]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

出　　处：《Paper And Biomaterials》2021年第3期1-9,共9页造纸与生物质材料（英文）

基　　金：The authors wish to express their gratitude for the grants from the National Key Research and Development Program of China(2017YFB0307903);Natural Science Foundation of China(21706154);Foundation of Key Laboratory of Pulp and Paper Science and Technology of the Ministry of Education of China(KF201916).

摘　　要：This study provides a comprehensive understanding of the polymeric properties of lignin-based non-isocyanate poly(iminehydroxyurethane)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.

关 键 词：LIGNIN non-isocyanate polyurethane SELF-HEALING REPROCESSING 

分 类 号：O636.2[理学—高分子化学]