Optically Active Poly(amide-imide)/TiO2 Bionanocomposites Containing L-Isoleucine Amino Acid Moieties: Synthesis, Nanostructure and Properties

In the present investigation, novel poly(amide-imide) (PAI)/titanium dioxide (TiO₂) bionanocomposites were prepared via ultrasonic irradiation process using TiO₂ nanoparticles modified by γ-aminopropyltriethoxyl silane. Optically active PAI containing L-isoleucine natural amino acid was synthesized in tetrabutyl ammonium bromide/triphenyl phosphite mixture and used as a polymer matrix. The nanostructure characterization results confirmed that the surface of TiO₂ nanoparticle has sufficient compatibility with PAI through the link of the coupling agent between TiO₂ and polymer. Through TEM photographs, it can be found that the surface modified TiO₂ nanoparticles with nanodiametric size of less than 40 nm, uniformly dispersed in the PAI matrix.