Takada, Kenji; Shinagawa, Hiromasa; Morita, Yuki; Grewal, Manjit S.; Taya, Kazuya; Kumar, Amit; Kaneko, Tatsuo published the artcile< Syntheses of Soluble Biopolyimides Using 4-Aminophenylalanine>, Electric Literature of 4415-87-6, the main research area is aminophenylalanine tetracarboxylic dianhydride polyamic acid thermal imidization biopolyimide.
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 NMR and IR 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 anal. 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.
Chinese Journal of Polymer Science published new progress about Glass transition temperature. 4415-87-6 belongs to class tetrahydrofurans, and the molecular formula is C8H4O6, Electric Literature of 4415-87-6.
Referemce:
Tetrahydrofuran – Wikipedia,
Tetrahydrofuran | (CH2)3CH2O – PubChem