文献类型：期刊文献

英文题名：Room-temperature self-healing polyurethane-cellulose nanocrystal composites with strong strength and toughness based on dynamic bonds

作者：Fan, Xu[1,2] Zhang, Lei[1] Dong, Fuhao[1] Liu, He[1] Xu, Xu[2]

第一作者：Fan, Xu

通信作者：Dong, FH[1]

机构：[1]Chinese Acad Forestry, Inst Chem Ind Forestry Prod, Key Lab Biomass Energy & Mat, Natl Engn Lab Biomass Chem Utilizat,Key & Open Lab, Nanjing 210042, Jiangsu, Peoples R China;[2]Nanjing Forestry Univ, Coll Chem Engn, Coinnovat Ctr Efficient Proc & Utilizat Forest Res, Jiangsu Prov Key Lab Chem & Utilizat Agroforest Bi, Nanjing 210037, Jiangsu, Peoples R China

年份：2023

卷号：308

外文期刊名：CARBOHYDRATE POLYMERS

收录：;EI(收录号：20230913653363);Scopus(收录号：2-s2.0-85148680139);WOS:【SCI-EXPANDED(收录号:WOS:000935382600001)】；

基金：This work was supported by Projects from the National Natural Science Foundation of China (32171722) and the National Natural Science Foundation of China (32071708) . Top-notch Academic Programs Project of Jiangsu Higher Education Institutions (ATPP) , the Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD) , and International Innovation Center for Forest Chemicals and Materials.

语种：英文

外文关键词：Cellulose nanocrystals; Composites; Self-healing; Mechanical properties

摘要：Self-healing materials suffer from a trade-off relationship between their self-healing ability and mechanical strength, which limits their applications. Therefore, we developed a room-temperature self-healing supramo-lecular composite based on polyurethane (PU) elastomer, cellulose nanocrystals (CNCs), and multiple dynamic bonds. In this system, the abundant hydroxyl groups on the surfaces of the CNCs form multiple hydrogen bonds with the PU elastomer, yielding a dynamic physical cross-linking network. This dynamic network enables self -healing without degrading the mechanical properties. As a result, the obtained supramolecular composites exhibited high tensile strength (24.5 +/- 2.3 MPa), good elongation at break (1484.8 +/- 74.9 %), favourable toughness (156.4 +/- 31.1 MJ m(-3), which is equivalent to that of spider silk and 5.1-times higher than that of aluminium), and excellent self-healing efficiency (95 +/- 1.9 %). Notably, the mechanical properties of the su-pramolecular composites were almost completely retained after reprocessing three times. Further, using these composites, flexible electronic sensors were prepared and tested. In summary, we have reported a method for preparing supramolecular materials having high toughness and room temperature self-healing ability that have applications in flexible electronics.