期刊
ACS SUSTAINABLE CHEMISTRY & ENGINEERING
卷 6, 期 11, 页码 14490-14500出版社
AMER CHEMICAL SOC
DOI: 10.1021/acssuschemeng.8b03151
关键词
Waterborne polyurethane (WPU); Self-healing; Recycling; Diels-Alder (DA) chemistry
资金
- National Natural Science Foundation of China [51773129, 51503130]
- Support Plan of Science and Technology Department of Sichuan Province, China [2017GZ0129, 2018SZ0174]
- International Science and Technology Cooperation Program of Chengdu [2017-GH02-00068-HZ]
- Postdoctoral research foundation of Sichuan University [2018SCU12049]
- Graduate Student's Research and Innovation Fund of Sichuan University [2018YJSY084]
By introducing novel stimuli-responsive Diels-Alder (DA) diol into polymer chains, a series of environmentally friendly, self-healing, and recyclable waterborne polyurethanes based on DA/retro-DA reactions (WPU-DA-x) were successfully prepared through a modified acetone process. The properties and appearance of the resultant WPU-DA-x latex were analyzed by considering particle size and zeta potential which show these dispersions with an outstanding storage stability. Simultaneously, the molecular mechanism of the self-healing behavior was extensively investigated via H-1 NMR, FT-IR, and UV-vis spectroscopies exhibiting effective reversibility of the DA/retro-DA chemistry. Moreover, WPU-DA-x films with outstanding mechanical performance show an excellent self-healing capability due to the couple/decouple process of the DA reactions, and the self-healing process was qualitatively and quantitatively studied. At the same time, the networked WPU-DA-x could be recycled via hot-pressing and solution casting. At last, the thermal stability of WPU-DA-x films was distinctly enhanced, as shown by the TGA results. The fruitful outcomes indicate that WPU-DA-x exhibited a great potential application as a smart material.
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