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Preparation of polyimide-metal complexes with tunable Sol-Gel transition by Introduction of Zn(II)-Coordination
- Source :
- Polymer Testing, Vol 111, Iss , Pp 107615- (2022)
- Publication Year :
- 2022
- Publisher :
- Elsevier, 2022.
-
Abstract
- Developing fully rigid-chain polyimides with reversible sol-gel/gel-sol transitions is of great interest for designing high-performance materials. To date, few approaches have been employed to construct polyimide gels other than hydrogen bonding. Here, we report a polyimide-Zn(II) complex with thermo-responsive sol-gel/gel-sol transition behavior by introducing supramolecular coordination interactions. The tunable dynamic sol-gel behaviors of polyimide-Zn(II) complexes were confirmed using rheological methods. Microstructure analysis shows that coordination interactions occur between the benzimidazole molecules and Zn(II) ions. As a result, the apparent viscosity of the polyimide-Zn(II) complex even rises approximately four orders of magnitude higher than that of the PI-neat oligomer solution. Based on the 2D-correlation spectra and X-ray diffraction results, we deduced that the formation of dense chain stacking caused by coordination effects plays an essential part in the reversible sol-gel transition. As a preliminary experiment, this work gives a novel strategy to construct polyimide gels, showing application prospects in the fabrication of porous polyimide membranes, high-performance polyimide fibers, and aerogels, etc.
Details
- Language :
- English
- ISSN :
- 01429418
- Volume :
- 111
- Issue :
- 107615-
- Database :
- Directory of Open Access Journals
- Journal :
- Polymer Testing
- Publication Type :
- Academic Journal
- Accession number :
- edsdoj.b69dd410851f4ad0ab714bde1234c07e
- Document Type :
- article
- Full Text :
- https://doi.org/10.1016/j.polymertesting.2022.107615