Journal
ACS SUSTAINABLE CHEMISTRY & ENGINEERING
Volume 8, Issue 51, Pages 18869-18878Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acssuschemeng.0c05481
Keywords
thermosetting polyimide; recyclability; shape memory; dynamic covalent bonds
Categories
Funding
- Key Research Program of Frontier Science, Chinese Academy of Sciences [QYZDJ-SSW-SLH056]
- National Natural Science Foundation of China [51673205, 51875549]
- Natural Science Foundation of Gansu Province [20JR5RA567]
- Youth Fund of Key Laboratory of Science and Technology on Wear and Protection of Materials, Chinese Academy of Sciences [SYSQJ-2020-2]
- Youth Innovation Promotion Association of Chinese Academy of Sciences [2018457]
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Recycling is a major approach in developing sustainable polymers to cope with environmental pollution and resource waste, but it still remains a challenge to design high-performance closed-loop recyclable shape memory polyimide. Here, we report a type of fully recyclable thermosetting shape memory polyimide (RPI) containing a reversible dynamic imine-cross-linked network formed via polycondensation between amine-terminated bisimide and 1,3,5-triformylbenzene in the absence of any catalyst. The cured RPI exhibits excellent mechanical properties with Young's modulus, breaking elongation ratio, and tensile strength of 1803 +/- 97 MPa, 10 +/- 2.3%, and 87.1 +/- 3.38 MPa, respectively. Moreover, the RPI features an excellent shape memory effect with a shape fixity ratio up to 96 +/- 1.1% and shape recovery ratio up to 97 +/- 0.32%. The controlled recycling experiments show that the obtained RPI can be fully closed-loop recycled with a strength recycling efficiency of 97%. The whole recycling process does not require additional metal catalysts or complicated hot-pressing processes, and the comprehensive performances of the reformed RPI are not compromised obviously. Owing to the high mechanical strength, thermostability, and excellent shape memory properties combined with recycling capabilities, the RPI is a promising multifunctional thermoset for sustainable engineering applications to avert environmental impact and resource waste.
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