Abstract
Synthesis of three novel crosslinked polyimides with push-pull azobenzene group has been developed. 4-Nitre4′-[N, N-bis (2-aminoethyl)]aminoazobenzene was first prepared, then poly(amic acid) prepolymer, one crosslinkable component, was obtained by aminolysis of alternating styrene-maleic anhydride copolymer, alternating thiophene-maleic anhydride copolymer or alternating benzofuran-maleic anhydride copolymer with it, and at last the crosslinked second-order nonlinear optical polyimide was synthesized by crosslinking and imidizing poly (amic acid) prepolymer with corresponding alternating copolymer. The crosslinking and imidizing processes were studied by IR and UV-Vis spectra. The chromophore density in one of the crosslinkable components, poly(amic acid) prepolymer, and the thermal stability of crosslinked polyimide thin film were measured by UV-Vis spectra.
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