Soft x-ray diffraction of striated muscle
S.F. Fan, W.B. Yun, et al.
Proceedings of SPIE 1989
A new A—B monomer, 2‐(4‐hydroxyphenyl)‐3‐phenyl‐6‐fluoroquinoxaline (1), which contains both a quinoxaline‐activated fluoro group and a phenol group was prepared and it's self‐polymerization studied. Compound 1 was prepared either by condensation of 3,4‐diaminofluorobenzene with 4‐hydroxybenzil, or condensation/demethylation with 4‐methoxybenzil in a one pot procedure. The polymerization of 1 was carried out in NMP in the presence of potassium carbonate at 180–190°C, analogous to previous examples of quinoxaline‐activated polyether synthesis. A new poly(aryl ether‐phenylquinoxaline) (2) was synthesized by this procedure, which was processable from N‐methylpyrrolidone, displayed a Tg of 255°C and a polymer decomposition temperature of 450°C. The mechanistic implications of quinoxaline activated fluoro‐displacement using an A—B monomer are discussed. Copyright © 1992 John Wiley & Sons, Inc.
S.F. Fan, W.B. Yun, et al.
Proceedings of SPIE 1989
I.K. Pour, D.J. Krajnovich, et al.
SPIE Optical Materials for High Average Power Lasers 1992
B.A. Hutchins, T.N. Rhodin, et al.
Surface Science
Xikun Hu, Wenlin Liu, et al.
IEEE J-STARS