Abstract
A novel unsymmetrical monomer 5-(4-aminophenoxy)naphthalene-1-amine was prepared from 5-amino1-naphthol and 4-nitrofluorobenzene by the nucleophilic substitution reaction followed by reduction using ‘Sn’ and HCl. The structure of the monomer was confirmed by FT-IR and 1H-NMR. A series of aromatic polyimides were successfully prepared from this diamine and aromatic dianhydrides through high temperature solution imidization technique. The polyimides were fully characterized by viscosity measurements, solubility test, FT-IR and 1H-NMR spectroscopy, X-ray diffraction, differential scanning calorimetry, and thermogravimetry. The X-ray diffraction patterns indicated that all these polyimides were amorphous. The polyimides exhibited good solubility in organic solvents. The glass transition temperature values were observed in the temperature range 210–287 °C. Thermogravimetric analysis indicated that 10% weight loss occurred in the temperature range 385–463 °C.
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