Baijun Liu, Wei Hu, Toshihiko Matsumoto
Jul 15, 2005
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0
Influential Citations
46
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Journal
Journal of Polymer Science Part A
Abstract
Two novel diamine monomers, 1,4-bis (4-aminophenoxy)-2-[(3′,5′-ditrifluoromethyl)phenyl]benzene and 1,4-bis [2′-cyano-3′(4″-amino phenoxy)phenoxy]-2-[(3′,5′-ditrifluoromethyl)phenyl] benzene, were synthesized from (3,5-ditrifluoromethyl)phenylhydroquinone. A series of ditrifluoromethylated aromatic polyimides derived from the diamines were prepared through a typical two-step polymerization method. These polyimides had a high thermal stability, and the temperatures at 10% weight loss were above 507 °C in nitrogen. Most of the polymers showed good solubility in anhydrated 1-methyl-2-pyrrolidone, N,N-dimethylacetamide, N,N-dimethylformamide, chloroform, and tetrahydrofuran at room temperature. All the polymers formed transparent, strong, and flexible films with tensile strengths of 63.6–95.8 MPa, elongations at break of 5–10%, and Young's moduli of 2.38–2.96 GPa. The dielectric constants estimated from the average refractive indices are 2.69–2.89. © 2005 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem 43: 3018–3029, 2005