Synthesis and characterization of styrene/maleimide copolymer with 4-[N-ethyl-N-(2-hydroxyethyl) amino]-4′-nitroazobenzene as side chain

✍ Scribed by Hongting Pu; Ling Liu; Weichun Jiang; Xinwan Li; Jianping Chen

• Publisher: John Wiley and Sons
• Year: 2008
• Tongue: English
• Weight: 175 KB
• Volume: 108
• Category: Article
• ISSN: 0021-8995
• DOI: 10.1002/app.27809

✦ Synopsis

Abstract

Relatively low thermal stability of second‐order nonlinear optical (NLO) coefficient due to the relaxation of dipole orientation is a major problem limiting the practical application of these NLO polymers. NLO polymers with suitable T~g~ are always important for optical devices. In the present work a synthetic approach to styrene‐(N‐(4‐hydroxyphenyl) maleimide) copolymer (SHMI) with 4‐[N‐ethyl‐N‐(2‐hydroxyethyl) amino]‐4′‐nitroazobenzene (DR1) as side chain and chromophores has made it possible to efficiently prepare a NLO polymer. The copolymer with high T~g~ of 202°C has low relaxation of dipole orientation. The maximum optical loss at the optical communication wavelength is less than 0.9 dB. NLO coefficient r~33~ is 8.2 pm/V (1550 nm) and its maximum relaxation at room temperature is 18%. © 2008 Wiley Periodicals, Inc. J Appl Polym Sci 2008