Crosslinkable maleimide copolymers for stable NLO properties |
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| Authors: | İ E Serhatli Y Yagci E Hattemer R Zentel E Schmälzlin S Hohenadl C Bräuchle K Meerholz |
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| Institution: | 1. Chemistry Department, İstanbul Technical University, 80626 Maslak-İstanbul, Turkey;2. Department of Chemistry and Institute of Materials Science, BUGH Wuppertal, Gauss Str. 20, 42097 Wuppertal, Germany;3. Institute of Physical Chemistry, LMU München, Butenandtstr. 11, D-81377 München, Germany |
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| Abstract: | Second-order, nonlinear optical polymers based on epoxy-substituted methylvinylisocyanates and N-substituted maleimides were synthesized and characterized with spectral and thermal analysis. The photocrosslinking and thermal-crosslinking reactions of copolymers with different chromophore contents were studied. Thermally induced crosslinking during the poling process, performed at the glass-transition temperature (Tg), was prevented by Tg being decreased through the addition of a plasticizer. Electrooptic coefficients (r33), measured for crosslinked and noncrosslinked systems, had similar absolute values and relaxation dynamics. This behavior was explained in terms of the similar rotational mobility of the chromophore units and the paucity of crosslinking sites. © 2001 John Wiley & Sons, Inc. J Polym Sci A: Polym Chem 39: 1589–1595, 2001 |
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| Keywords: | nonlinear optical polymers maleimide copolymers crosslinking |
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