Hj. Lee et al., Crosslinkable polymers for optical waveguide devices. II. Fluorinated ether ketone oligomers bearing ethynyl group at the chain end, J POL SC PC, 37(14), 1999, pp. 2355-2361
Citations number
14
Categorie Soggetti
Organic Chemistry/Polymer Science
Journal title
JOURNAL OF POLYMER SCIENCE PART A-POLYMER CHEMISTRY
Fluorinated ether ketone oligomers bearing a crosslinkable ethynyl group at
the chain end have been investigated for low-loss polymer optical waveguid
e devices. These oligomers are designed to achieve low birefringence and we
re synthesized by the reaction of 4,4'-(hexafluoroisopropylidene)diphenol w
ith an excess decafluorobenzophenone, followed by reaction with (phenylethy
nyl)phenol or ethynylphenol. The molecular weights (M(n)s) and polydispersi
ties of the oligomers determined by GPC with polystyrene standard are in th
e range of 6600-8500 g/mol and 1.79-2.04, respectively. By spin coating and
thermal crosslinking, the polymer solutions easily provide the good optica
l quality thin films. The cured films show good chemical resistance and hig
h thermal stability up to 460 degrees C under nitrogen. At 1.55 mu m wavele
ngth, the refractive index and birefringence of the films show in the range
of 1.5104-1.5172 and 0.0078-0.0014, respectively. The propagation loss of
the single-mode channel waveguide was measured to be less than 0.5 dB/cm at
1.55 mu m. (C) 1999 John Wiley & Sons, Inc.