PREPARATION OF A NOVEL SELF-ASSEMBLING NONLINEAR-OPTICAL (NLO) POLYMER FILM

A novel self-assembling crosslinking second harmonic generation nonlin ear optical (SHG/NLO) film with high SHG coefficient (2 x 10(-7) e.s.u . by LR dichroism) was prepared by molecular design and ''in-situ pali ng and sol-gel process''. The content of the NLO chromophore (S)-(-)-1 -(4)-nitrophenyl-2-pyrrolidinemethanol (NPP) is as high as 50 mol% sin ce NPP molecules probably disperse in the film at a molecular level. T he film is rigid, uniform and transparent. This designed clathrate sup ermolecular structure was poved by IR, atomic force microscopy (AFM) a nd differential scanning calorimetry (DSC) detection. The title film e xhibits a long-term temporal stability with 95% of the initial value o f SHG coefficient maintained even after 20 d at 65 degrees C (by UV sp ectroscopy).