J. Liu, M. He, Z. X. Li
May 15, 2002
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Influential Citations
54
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Journal
Journal of Polymer Science Part A
Abstract
New aromatic diamines substituted with a trifluoromethyl group in the side chain, 2,4-diamino-3′-trifluoromethylazobenzene, 2,4-diamino-1-[(4′-trifluoromethylphenoxy) phenyl] aniline, and 3,5-diamino-1-[(4′-trifluoromethyl phenoxy) phenyl] benzamide were synthesized and characterized and used to prepare polyimides by a one-step high-temperature polycondensation method. Experimental results indicated that the prepared polyimides possess good solubility in strong organic solvents such as N-methyl-2-pyrrolidinone, N,N′-dimethylformamide, and N,N′-dimethylacetamide. Homogeneous solutions with solid contents as high as 15–20% can be prepared, which are stable for storing longer than 2 weeks at room temperature. The polyimides exhibited glass-transition temperatures of 249–292 °C and good thermal stability. The PI-Ic and PI-IIIc films prepared by casting the fully imidized polymer solutions showed good transparency with cutoff wavelengths at 320–330 nm. © 2002 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem 40: 1572–1582, 2002