1. Syntheses of Soluble Biopolyimides Using 4-Aminophenylalanine.
- Author
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Takada, Kenji, Shinagawa, Hiromasa, Morita, Yuki, Grewal, Manjit S., Taya, Kazuya, Kumar, Amit, and Kaneko, Tatsuo
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POLYIMIDES , *PROTON magnetic resonance , *AMIC acids , *ORGANIC solvents - Abstract
4-Aminophenylalanine (4APhe), an exotic amino acid which is obtained as a microorganism metabolite of glucose, is polycondensed with various tetracarboxylic dianhydrides as a diamine monomer to obtain poly(amic acid)s. Subsequent thermal imidization of poly(amic acid)s is made at 220 °C with stepwise heating from 100 °C. Some of the obtained polyimides (PIs) exhibited good solubility in organic solvents such as N,N-dimethylformamide, N,N-dimethylacetamide, and more. The progress of imidization was observed by proton nuclear magnetic resonance and infrared spectroscopy to confirm that the imidization ratio was up to 98%. Carboxylate group of the side-chains of PIs affected their solubilities despite the high imidization ratio, and the solubility was lost for any organic solvents by decarboxylation at 280 °C, confirmed from mass-loss of thermogravimetric analysis. Thus, a new series of PIs were obtained with abilities of solvent-molding in PI state and thermal resistivity enhancement by further heating after molding. [ABSTRACT FROM AUTHOR]
- Published
- 2020
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