This study concerted on the immobilization of nano-titanium dioxide particles (TiO2, 30–50 nm particle
size) into or onto an optically active poly(amide-imide) (PAI). The matrix PAI consisted of the chiral
units in the main and hydroxybenzamide functional groups in the side chains. The macromolecule
structure has been fabricated from the reaction of 3,5-diamino-N-(4-hydroxyphenyl) benzamide and
N,N
-(pyromellitoyl)-bis-L-phenylalanine diacid chloride atlow temperature. The hydroxyl groups on the
side chains of the PAI could provide better compatibility and bonding, which cause to suitable homogenous dispersion of nanoparticles (NPs) in the obtained nanocomposites (NCs). Also due to prevention of
aggregation, the surface of TiO2 NPs was functionalized by 3-aminopropyltri-ethoxysilane as a coupling
agent to introduce amine groups on the NPs surfaces. Atomic force microscopy, field emission scanning
electron microscopy, transmission electron microscopy and contact angle measurements were used for
investigation of the surface properties of obtained NCs. These results confirmed the well-dispersion of
nanoTiO2 in the PAI matrix.