A NOVEL SELF-ASSEMBLED NLO STRUCTURALLY CONTROLLED POLYMER FILM

A novel self-assembled NLO(Nonlinear Optical) polymer film constructed from a structurally controlled, cage-like crosslinking polymer(SCCP) and chromophore ((S)-(-)-1-(4)-Nitrophenyl-2-pyrro-lidinemethanol) emb edded in SCCP has been prepared by ''sol-gel process''. The cage size of SCCP was designed according to the molecular size of NPP so that ea ch cage could trap one NPP molecule. The film is uniform and transpare nt when the molar ratio of chromophore/organosilicon spacer was 1:1 wi thout any phase separation. It's chi((2))(coefficient of second harmon ic generation) is 3.0x10(-8)e.s.u. measured by IR dichroism. The struc ture has been investigated by AFM (atomic force microscopy), IR, solub ility test. The result indicated that the chromophore molecules NPP wa s largely trapped within the cages of the crosslinking polymers at mol ecular level.