Preparation And Propeties Of Novel Second-Order Nonlinear Optical Materials

Second-order nonlinear optical (NLO) polymeric materials have attracted considerable attention due to their potential applications in broad bandwidth telecommunication, information processing, and radar systems. Electro-optic (EO) polymeric materials, which possess large and rapid NLO responses, low dielectric constant, high laser damage thresholds, low cost, superior chemical flexibility and ease of processing, have been predicted to be the NLO polymers closest to commercialization. In this thesis, we designed and synthesized NLO octupolar molecules, which presence of a C3rotating axis and each molecule with three same groups attached to2,4,6-positions on al,3,5-triazine core, and then prepared to NLO polymers(P1-P7) by condensation reaction.We also study the solubility, optical transparency, thermal stability, film-forming properties of materials and the relation of second-order nonlinear optical effects to molecular structure.The first part is literature review. In this section we briefly introduced the basic principles of second-order nonlinear optical, second-order nonlinear optical effects and test methods, design theory and testing methods of second-order nonlinear optical chromophore molecules and polymer materials,and focuse on the research progress of Second-order nonlinear optical (NLO) polymeric materials and propose our research ideas in this paper.The second part is the preparation and characterization of octupolar molecule. In this section we have designed and synthesized a octupoar molecule2,4,6-tris{4-{4-[N-ethyl-N-(2-hydroxyethyl)]amino-phenylazo}styryl}-s-triazine base on octupole system model and characterized by1HNMR and FT-IR.The third part is the preparation and characterization of the second-order nonlinear optical (NLO) polymeric materials. We choose seven coupling agents reacted with octupolar molecule prepared in the second part and synthesized seven different polymers and all of these polymers are characterized by1HNMR and FT-IR.The fourth part is the preparation and characterization of the second-order nonlinear optical (NLO) films. Film materials were prepared by octupolar molecule(P) synthesized in the second part and polymers(P1-P7) synthesized in the third part,and then we analyzed and discussed the film-forming process.We also studied the solubility of polymer material,and utilized thermal weight loss (Tg) studied the thermal stability,and utilized UV-visible spectra studied the optical transparency. The second-order nonlinear optical properties of polymeric materials and orientation stability of chromophore octupole molecule in the polymeric materials are entrusted to be tesed, which were not discussed in this article.