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Photocrosslinkable Liquid Prepolymers for Flexible Waveguide Display Applications
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- Authors
- Seung Koo Park, Jung Jin Ju, Jin Tae Kim, Min-su Kim, Jaehyun Moon, Jeong-Ik Lee, Hye Yong Chu, Dong Wook Kim, Ki-Uk Kyung, Suntak Park
- Issue Date
- 2013-05
- Citation
- Journal of Materials Chemistry C : Materials for Optical and Electronic Devices, v.1, no.17, pp.2983-2989
- ISSN
- 2050-7526
- Publisher
- Royal Society of Chemistry (RSC)
- Language
- English
- Type
- Journal Article
- Abstract
- We have prepared and evaluated two liquid prepolymers and their UV-cured films for flexible display applications. 2,3,5,6,2??,3??,5??, 6??-Octafluoro-4,4??-bis-[2-(2-{2-[2-(2,3,5,6-tetrafluoro-4-vinyl- phenoxy)-ethoxy]-ethoxy}-ethoxy)-ethoxy]-biphenyl (7) and 2,3,5,6,2??, 3??,5??,6??-octafluoro-4,4??-bis-[2-(2-{2-[1, 1-difluoro-2-(2,3,5,6-tetrafluoro-4-vinyl-phenoxy)-ethoxy]-1,1,2, 2-tetrafluoro-ethoxy}-1,1,2,2-tetrafluoro-ethoxy)-2,2-difluoro-ethoxy]-biphenyl (8) are synthesized with decafluorobiphenyl, 2,3,4,5,6-pentafluorostyrene, and tetraethylene glycol or fluorinated tetraethylene glycol. The UV-cured films prepared from these prepolymers show mechanical flexibility and optical transparency. The refractive indices and optical losses of the films prepared from prepolymers 7 and 8 are around 1.51 and 1.43, and 1.03 and 1.06 dB cm -1 at a wavelength of 633 nm. The films are thermostable at high temperature over 350 °C. The ultimate stress, initial modulus, and elongation of the films prepared from prepolymers 7 and 8 are 15.5 MPa, 0.42 GPa, and 12.2%, and 13.8 MPa, 0.49 GPa, and 6.8%, respectively. Finally, we have demonstrated a flexible waveguide display film fabricated from our prepolymers and identified the liquid prepolymers as possible good candidate materials for flexible display applications. © 2013 The Royal Society of Chemistry.
- KSP Keywords
- Display applications, Flexible waveguide, High Temperature, Initial modulus, Mechanical flexibility, Optical losses, Tetraethylene glycol, UV-cured films, Ultimate stress, flexible display, optical transparency