Nonlinear optical (NLO) polymers with glass transition temperatures (Tg) as high as 275°C were prepared by covalent bonding of a chromophore to the backbone of hydroxyl polyimides via a Mitsunobu reaction. NLO side-chain polyimides with different polymer backbones and different chromophores were prepared and characterized by second-harmonic generation. Poled films of the polymers have an excellent nonlinear optical response that is stable at elevated temperatures.
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Broeck et al. (1999) studied this question.
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