Macromolecular Research, Vol.19, No.4, 403-407, April, 2011
Electro-optic Effect of a Soluble Nonlinear Optical Polyimide Containing Two Different Chromophores with Different Sizes in the Side Chain
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A new soluble and thermally stable nonlinear optical (NLO) polyimide was synthesized by adding both tricyanopyrroline (TCP)- and tricyanofuran (TCF)-based NLO chromophores into the polymer backbone. The NLO polyimide (PI-II) bearing two different chromophores with different sizes has a glass transition temperature of 146 ℃ and exhibits good film forming properties. The electro-optic coefficient of the film was 84 pm/V at 1.3 μm under a poling field of 80V/μm, even though PI-II has an unusually high chromophore density of approximately 20 wt% of TCP chromophores and 23 wt% of TCF chromophores. Even with a overall chromophore loading of 43 wt%, no severe aggregation effect was observed for the sample that exhibited a relatively high EO coefficient.
Keywords:soluble polyimide;tricyanopyrroline chromophore;tricyanofuran chromophore;electro-optic effect;thermal stability.
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