Crosslinkable polymers for optical waveguide devices. II. Fluorinated ether ketone oligomers bearing ethynyl group at the chain end

✍ Scribed by Hyung-Jong Lee; Myung-Hyun Lee; Min-Cheol Oh; Joo-Heon Ahn; Seon Gyu Han

• Publisher: John Wiley and Sons
• Year: 1999
• Tongue: English
• Weight: 185 KB
• Volume: 37
• Category: Article
• ISSN: 0887-624X
• DOI: 10.1002/(sici)1099-0518(19990715)37:14<2355::aid-pola9>3.0.co;2-9

✦ Synopsis

Fluorinated ether ketone oligomers bearing a crosslinkable ethynyl group at the chain end have been investigated for low-loss polymer optical waveguide devices. These oligomers are designed to achieve low birefringence and were synthesized by the reaction of 4,4Ј-(hexafluoroisopropylidene)diphenol with an excess decafluorobenzophenone, followed by reaction with (phenylethynyl)phenol or ethynylphenol. The molecular weights (M n s) and polydispersities of the oligomers determined by GPC with polystyrene standard are in the 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 optical quality thin films. The cured films show good chemical resistance and high thermal stability up to 460°C under nitrogen. At 1.55 m wavelength, 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 m.