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29 December 1999 NLO-active maleimide copolymers
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Proceedings Volume 4016, Photonics, Devices, and Systems; (1999)
Event: Photonics Prague '99, 1999, Prague, Czech Republic
We synthesized some novel rigid NLO-active maleimide copolymers bearing DR-1 moieties (PMPD, PHSD, and PHND). All copolymers exhibited high Tgs and good solubilities for common solvents and excellent film-forming properties. Dependence of film thickness on the d33 value for the poled copolymers induced by corona poling was investigated and it was demonstrated that from less than thickness of 0.3 micrometers decrease of the thickness gives rise to remarkable increase in the d33 value. The poled copolymers exhibited large d33 value for PMPD, 290 X 10-9 esu for PHSD and 350 X 10-9 esu as well as large r33 values. The d33 values of the poled copolymers were kept constant even after standing 1000 h at 80 degrees C, although a small decrease was observed at a very initial state. Further, the d33 values did not change up to ca. 123 degrees C upon heating at the rate of 10 degrees C/min in all cases.
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Masao Kato, Takao Shiraga, Takashi Fukuda, Hiro Matsuda, and Hachiro Nakanishi "NLO-active maleimide copolymers", Proc. SPIE 4016, Photonics, Devices, and Systems, (29 December 1999);

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