文献类型：期刊文献

英文题名：Thermal-induced self-healing bio-based vitrimers: Shape memory, recyclability, degradation, and intrinsic flame retardancy

作者：Li, Wenbin[1,2] Xiao, Laihui[4] Wang, Yigang[1] Huang, Jinrui[1] Liu, Zengshe[3] Chen, Jie[1] Nie, Xiaoan[1]

第一作者：Li, Wenbin

通信作者：Chen, J[1];Nie, XA[1]

机构：[1]Chinese Acad Forestry, Inst Chem Ind Forest Prod, Key Lab Biomass Energy & Mat, Nanjing 210042, Jiangsu, Peoples R China;[2]Nanjing Forestry Univ, Coinnovat Ctr Efficient Proc & Utilizat Forest Re, Nanjing, Peoples R China;[3]ARS, USDA, Natl Ctr Agr Utilizat Res, Biooils Res Unit, 1815N Univ St, Peoria, IL 61604 USA;[4]Univ Birmingham, Sch Chem, Birmingham B15 2TT, W Midlands, England

年份：2022

卷号：202

外文期刊名：POLYMER DEGRADATION AND STABILITY

收录：;EI(收录号：20222612295333);Scopus(收录号：2-s2.0-85132934315);WOS:【SCI-EXPANDED(收录号:WOS:000828190200002)】；

基金：The authors are grateful for the support and funding from the Innovation and Promotion Project for Forestry Science and Technology of Jiangsu Province (LYKJ [2019] 45), and the Jiangsu Key Lab of Biomass-based Fuels and Materials (JSBEM-S-202002). National Natural Science Foundation of China for Youth Science Funds (51803234), Fundamental Research Funds of Research Institute of Forest New Technology, CAF (CAFYBB2019SY028), the Fundamental Research Funds for the Central Non-profit Research Institution of CAF (CAFYBB2020QB006). This work was supported in part by the U.S. Department of Agriculture, Agricultural Research Service.

语种：英文

外文关键词：Epoxy vitrimers; Self-healing; Recycling; Degradable; Flame retardancy

摘要：The structure of epoxy resin determines its flammable property, non-reprocessing, unrecyclable, and nonde-gradable, which limits their application. Thus, a novel disulfide bond-containing dynamic covalent thiol-ene crosslinked epoxy vitrimers (TECEVs) as covalently adaptable networks were synthesized. Also, the structure-property relationship of polymeric compounds was investigated. The insoluble vitrimers networks demonstrated faster stress relaxation with 107 s at 200 degrees C, and obtained lower activation energy between 70.52 and 110.57 k.Jmol(-1). In addition, the dynamic nature of the disulfide bond allowed the damaged TECEVs to be thermal-induced self-repairing and self-healing materials with efficiencies 100% at 160 degrees C. It was discovered that TECEVs can be reprocessed at 160 degrees C with the recovery of mechanical strength above 80% and be completely decomposed in an ethanol-acid catalyst solution. Moreover, typical TECEVs can function with excellent flame retardancy and illustrated a high limit oxygen index (LOI, 27.45-28.36%), and UL-94 V-0 rating was achieved. This work could provide an efficient strategy for the synthesis of "biobased self-repairing flame retardant" networks and contribute to the development of high-performance sustainable polymers.