Second-order NLO polyamideimides based on functionalized stilbene derivatives: direct polycondensation and characterization

摘要: Abstract Polyamideimides having nonlinear optical (NLO)-active chromophores were synthesized by direct polycondensation of 4-[N,N′-bis(2-aminoethyl)amino]-4′-nitrostilbene (DANS-diamine) with oxy-bis[N-(4-phenylene)trimellitic imide] (BCI), N-(3-carboxyphenyl)-trimellitimide (BTI) and trimellitic anhydride chloride (TMAC). The NLO polyamideimides without a curing step may ameliorate the property polymers reducing propagation loss. resulting highly soluble in aprotic polar solvents such as DMF, DMAc, NMP, etc. exhibited inherent viscosity range 0.14–0.33 dl g−1. Molecular structural characterization for was achieved 1H n.m.r., FTi.r. u.v.-visible spectroscopies. glass transition temperature 142–224°C they showed thermal stability up to 260°C. polymer solutions could be spin coated onto indium—tin-oxide (ITO) or quartz disc substrates form quality thin films. electro-optic coefficients (r33) at wavelength 1.3 μm, measured simple reflection method, films poled around 1.9–7.4 pm V−1.