Chin‐Ping Yang, Yu-Yang Su, Kuen-Lin Wu
Nov 1, 2004
Citations
1
Influential Citations
66
Citations
Journal
Journal of Polymer Science Part A
Abstract
A novel, fluorinated diamine monomer, 2,5-bis(4-amino-2- trifluoromethylphenoxy)-tert-butylbenzene (II) was synthesized through the nucleophilic substitution reaction of tert-butylhydroquinone (t-BHQ) and 2-chloro-5-nitrobenzotrifluoride in the presence of potassium carbonate to yield the intermediate dinitro compound I, followed by catalytic reduction with hydrazine and Pd/C to afford diamine II. A series of fluorinated polyimides V were prepared from II with various aromatic dianhydrides (IIIa–f) via the thermal imidization of poly(amic acid). Most of Va–f could be soluble in amide-type solvents and even in less polar solvents. These polyimide films showed tensile strengths up to 106 MPa, elongation at break up to 21%, and initial modulus up to 2.1 GPa. The glass-transition temperature of V was recorded at 245–304 °C, the 10% weight loss temperatures were above 488 °C, and left more than 41% residue even at 800 °C in nitrogen. Low dielectric constants, low moisture absorptions, and higher and light-colored transmittances were also observed. © 2004 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem 42: 5424–5438, 2004