Synthesis and photorefractivity of poly[methyl‐3‐(7‐dibenzo[a,g]carbazolyl)‐propylsiloxane] |
| |
| Authors: | In Kyu Moon Chil‐Sung Choi Nakjoong Kim |
| |
| Institution: | 1. Environment and Energy Division, Korea Institute of Industrial Technology, 35‐3 Hongcheon, Ipjangmyeon, Cheonansi, Chungriam 330‐825, Korea;2. Department of Chemistry, Hanyang University, 17 Haengdang‐Dong, Seongdong‐Gu, Seoul 133‐791, Korea |
| |
| Abstract: | 7H‐Dibenzoa,g]carbazole‐substituted polysiloxane (PSX‐a,g]BCz) has been synthesized by hexachloroplatinate (IV) hydrate polymerization from poly(methylhydrosiloxane) and 7‐ally‐7H‐dibenzoa,g]carbazole. PSX‐a,g]BCz composite showed large orientational birefringences because of both large dipole moments and high‐polarizability anisotropies of P‐IP‐DC chromophore associated with the effective conjugation along the polyene. The 50‐μm thick photorefractive material containing 30 wt % 2‐3‐(E)‐2(piperidino)‐1‐ethenyl]‐5,5‐dimethyl]‐2‐cyclohexenyliden]malononitrile showed a diffraction efficiency of 51% at 55 V/μm, which corresponded to a Δn of 3.45 × 10?3. PSX‐a,g]BCz composite shows a fast time constant of 0.42 s at 34 °C and 55 V/μm, which corresponded to the space‐charge field of 12 V/μm under 70 V/μm. © 2008 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem 46: 1783–1791, 2008 |
| |
| Keywords: | benzocarbazole photorefractive composite photorefractive effect polysiloxanes |
|
|
