文献类型：期刊文献

英文题名：Mechanically robust, healable, shape memory, and reprocessable biobased polymers based on dynamic pyrazole-urea bonds

作者：Zhang, Jinshuai[1,2] Zhang, Chaoqun[3] Shang, Qianqian[1,2] Hu, Yun[1,2] Song, Fei[4] Jia, Puyou[1,2] Zhu, Guoqiang[1,2] Huang, Jia[1,2] Liu, Chengguo[1,2] Hu, Lihong[1,2] Zhou, Yonghong[1,2]

通信作者：Liu, CG[1];Liu, CG[2]

机构：[1]Chinese Acad Forestry, Key Lab Biomass Energy & Mat,Natl Engn Lab Biomas, Coinnovat Ctr Efficient Proc & Utilizat Forest Re, Key Lab Chem Engn Forest Prod,Natl Forestry & Gra, 16 Suojin Wucun, Nanjing 210042, Peoples R China;[2]Chinese Acad Forestry, Inst Chem Ind Forest Prod, 16 Suojin Wucun, Nanjing 210042, Peoples R China;[3]South China Agr Univ, Coll Mat & Energy, Key Lab Biobased Mat & Energy, Minist Educ, 483 Wushan Rd, Guangzhou 510642, Peoples R China;[4]Nanjing Forestry Univ, Coll Chem Engn, Nanjing 210037, Peoples R China

年份：2022

卷号：169

外文期刊名：EUROPEAN POLYMER JOURNAL

收录：;EI(收录号：20221211815218);Scopus(收录号：2-s2.0-85126559382);WOS:【SCI-EXPANDED(收录号:WOS:000806759800002)】；

基金：Acknowledgements This research was funded by the Fundamental Research Funds of CAF (CAFYBB2020QA005) and the National Natural Science Founda-tion of China (31770615 and 31822009) .

语种：英文

外文关键词：Castor oil; Pyrazole-urea bond; Self-healing; Recyclability; Recoverable adhesive

摘要：Development of biobased polymers with self-healing, shape memory, and reprocessable features is of great significance for sustainable development, environmental protection, and high-end applications. Herein, we report robust, repairable, shape memory, and reprocessable poly (urethane-urea) (PPU) polymers derived from renewable castor oil enabled by dynamic pyrazole-urea bonds and hydrogen bonds. The optimal PPU material (PPU3) demonstrated tensile strength and toughness up to 30.6 MPa and 34.9 MJ.m(-3), respectively, which were superior to most of the reported oil-based dynamic covalent materials. Furthermore, the pyrazole-urea bonds and intramolecular hydrogen bonds enabled the PPU materials with excellent repairability, recyclability, malleability, and shape memory. For instance, the PPU3 polymer could be recycled rapidly at relatively mild conditions (10 min at 140 degrees C, 10 MPa), and no obvious decrease in tensile strength and strain at break was observed after being recycled for at least 4 times. Finally, the application of PPU3 as recoverable adhesive was also studied. The PPU3 polymer could be quickly re-bonded by a heating and cooling treatment for at least 30 times without significant deterioration in adhesion strength.