Abstract
A branched structure bichromophore was developed to increase the nonlinearity of optical polymers. The branched bichromophore was incorporated into the polymer backbone to prepare a novel nonlinear optical (NLO) side-chain fluorinated polyimide with high optical nonlinearity and good thermal stability. The novel nonlinear optical side-chain fluorinated polyimide exhibits a large electro-optic (E-O) coefficient (γ33) (34 pm/V at 1550 nm) which is larger than that of the conventional side-chain optical polyimide. This is mainly attributable to an increased chromophore concentration and high polarizing efficiency derived from the branched structure. The branched structure of the bichromophore is incorporated into a polymer backbone to result in a high chromophore concentration. Moreover, the three-dimensional (3D) architecture and large molecular size of the branched bichromophore can spatially shield from strong interchromophore electrostatic interactions to enhance the poling efficiency. The side-chain fluorinated polyimide exhibits excellent solubility in common organic solvents, good film-forming property, high glass-transition temperature (T g) (190 °C) and thermal stability up to 235 °C.
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The authors are grateful to the National Nature Science Foundation of China (51077013) for financial supports.
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10853_2012_7120_MOESM1_ESM.pdf
1H-NMR spectrum of DEHNT, FT-IR spectrum of FPI- DEHNT, 1H-NMR spectrum of FPI- DEHNT, GPC plot of FPI-DEHNT, DSC curve of side-chain polyimide FPI-DEHNT and TGA of side-chain polyimide FPI-DEHNT and chromophore DEHNT are given in Online Resource 1 (PDF 142 kb)
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He, M., Zhou, Y., Gao, Y. et al. Molecular design and synthesis of branched bichromophore-attached linear fluorinated polyimides for nonlinear optical applications. J Mater Sci 48, 3370–3377 (2013). https://doi.org/10.1007/s10853-012-7120-9
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DOI: https://doi.org/10.1007/s10853-012-7120-9