Quick Search:       Advanced Search
Synthesis of Lignin-based Non-isocyanate Poly(imine-hydroxyurethane)s Networks. Part II: Self-healing, Reprocessing, and Degradation
Received:March 31, 2021    Click here to download the full text
Citation of this paper:
Hits: 14
Download times: 41
Author NameAffiliation
Shen Chao College of Bioresources Chemical and Materials Engineering, Shaanxi University of Science and Technology, Xi'an, Shaanxi Province, 710021, China 
Xue Bailiang 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 
Xue Danwei College of Bioresources Chemical and Materials Engineering, Shaanxi University of Science and Technology, Xi'an, Shaanxi Province, 710021, China 
Tang Rui College of Bioresources Chemical and Materials Engineering, Shaanxi University of Science and Technology, Xi'an, Shaanxi Province, 710021, China 
Zhao Wei College of Bioresources Chemical and Materials Engineering, Shaanxi University of Science and Technology, Xi'an, Shaanxi Province, 710021, China 
Li Xinping College of Bioresources Chemical and Materials Engineering, Shaanxi University of Science and Technology, Xi'an, Shaanxi Province, 710021, China 
 
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.
keywords:lignin  non-isocyanate polyurethane  self-healing  reprocessing
HTML  View Full Text  View/Add Comment  Download reader