J.H. Kaufman, Owen R. Melroy, et al.
Synthetic Metals
Novel imide-aryl ether phenylquinoxaline copolymers were prepared and their morphology and mechanical properties investigated. A key feature of these copolymers is the incorporation of an aryl ether phenylquinoxaline linkage into a semi-rigid polyimide backbone based on 4,4′-oxydianiline (ODA) and pyromellic dianhydride (PMDA) by the use of either 1,4-bis[6-(3-aminophenoxyl)-3-phenyl-2-quinoxalinyl] benzene or 1,4-bis[6-(4-aminophenyoxyl)-3-phenyl-2-quinoxalinyl]benzene as co-diamines. These monomers were prepared by a novel nucleophilic aromatic substitution reaction of 1,4-(6-fluoro-3-phenyl-2-quinoxalinyl) benzene with 4- or 3-aminophenol in the presence of K2CO3. These diamines were used as co-monomers with PMDA and ODA to synthesize poly(amic-acids). Films were cast and cured (350°C) to effect imidization, affording films which showed high elongations and moduli. The copolymers with high phenylquinoxaline compositions displayed Tg values in the 300°C range. The thermal stability of the copolymers was comparable to that of the parent polyimide with decomposition temperatures between 470 and 530°C. The morphology of the copolymers was investigated by dynamic mechanical, wide angle X-ray diffraction (WAXD) and swelling measurements. © 1991.
J.H. Kaufman, Owen R. Melroy, et al.
Synthetic Metals
David B. Mitzi
Journal of Materials Chemistry
M. Hargrove, S.W. Crowder, et al.
IEDM 1998
S.F. Fan, W.B. Yun, et al.
Proceedings of SPIE 1989