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NLO‐active maleimide copolymers with high glass transition temperatures
Author(s) -
Kato Masao,
Shiraga Takao,
Kimura Tatsumi,
Fukuda Takashi,
Matsuda Hiro,
Nakanishi Hachiro
Publication year - 2002
Publication title -
polymers for advanced technologies
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.61
H-Index - 90
eISSN - 1099-1581
pISSN - 1042-7147
DOI - 10.1002/pat.163
Subject(s) - maleimide , copolymer , materials science , glass transition , poling , polymer chemistry , composite material , analytical chemistry (journal) , organic chemistry , polymer , chemistry , dielectric , ferroelectricity , optoelectronics
We synthesized some novel rigid NLO‐active maleimide copolymers bearing DR‐1 moieties ( PMPD , PHSD and PHND ). All copolymers exhibited high T g 's (190∼197 °C), good solubilities for common solvents and excellent film‐forming properties. Dependence of film thickness on the d 33 value for the poled copolymer films induced by corona poling was investigated and it was demonstrated that in less than thickness of 0.3 µm decrease of the thickness gives rise to remarkable increase in the d 33 value. The poled copolymer films exhibited large d 33 values (270 × 10 −9 esu (film thickness 0.13 µm) for PMPD , 290 × 10 −9 esu (0.12 µm) for PHSD and 350 × 10 −9 esu (0.08 µm) for PHND ) as well as large r 33 values (51.0 pmV −1 for PMPD and 60.4 pmV −1 for PHND ) which are significantly large compared to the value of LiNbO 3 (31 pmV −1 ) as a typical EO material. The d 33 values of the poled copolymers were kept constant even after standing 1000h at 80 °C, although a small decrease was observed at an initial stage. Further, the d 33 values did not change up to ca. 123 °C upon heating at the rate of 10 °C/min in all cases. Copyright © 2002 John Wiley & Sons, Ltd.