Synthesis of polyimides containing nonlinear optical chromophores and a preparation method thereof

摘要

The present invention relates to a polyimide compound having a non-linear optical material having a good thermal solubility and having a very low light transmission loss by introducing a method that is imidized directly without passing through a polyamic acid, and has a thermally stable electro-optic property. will be. The polyimide compound of the present invention is shown in the following formula (4).;[Formula 4];In Chemical Formula 4,;n is the degree of polymerization and is a natural number in the range of 10 to 100,;X is SO ₂ , CO, C (CF ₃ ) ₂ , O or Si (CH ₃ ) ₂ ,;NLO is a DANS (4- [N- (2-alkyloxy) amino] -4'-nitrostilbene) derivative,;DASS (4- [N- (2-alkyloxy) sulfonyl] -4 '-(N, N'-dialkylamino) stilbene derivative,;Or disperse red 1.