Synthesis and characterization of the thermoplastic epoxy phenolic resin for second-order nonlinear optical materials

摘要

A second-order nonlinear thermoplastic epoxy phenolic resin (NLOPF) was synthesized by phenol, p-Nitoaniline, epoxy chloropropane and formaldehyde. The nonlinear optical (NLO) film was fabricated by spin-coating. Then it was poled in the electric field at room temperature. The orientations of the chromo-phores were fixed by the thermal-cross-linked structures. The second-order nonlinearity of the films was measured by simple reflection technique. The values of electro-optic coefficient (r_(33)) of the films with different chromophore content were 2.32, 4.53, 6.78, 8.65,10.42 pm/V, respectively. They were stabilized around 95% of their initial values after 100 h at 80 ℃.