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Development of novel chiral poly(amide-imide)/bionanocomposites containing N,N'-(pyromellitoyl)-bisphenylalanine units reinforced by organoclay and modified TiO2

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Journal of Thermoplastic Composite Materials

Published online on

Abstract

In the present investigation, novel optically active poly(amid–imide) (PAI)/organoclay (OC)/titanium dioxide (TiO2) bionanocomposite (BNC) films were prepared by solution intercalation method. These BNCs were synthesized by blending the chiral OC and modified TiO2 nanoparticles (NPs) with the PAI solution. An optically active PAI containing <sc>l</sc>-phenylalanine amino acid was synthesized via direct polycondensation reaction of N,N'-(pyromellitoyl)-bis-phenylalanine diacid 4 with 4,4'-diaminodiphenylsulfone 5 in the presence of molten tetrabutylammonium bromide as a green solvent. This polymer was end capped with amine end groups of diamine in the final polymerization process. Cloisite Na+ and protonated form of <sc>l</sc>-phenylalanine amino acid were used for the preparation of the chiral OC via ion-exchange reaction. The surface of TiO2 NPs was fictionalized by KH550 (-aminopropyltriethoxyl) coupling agent under ultrasonic irradiation. Finally, PAI/OC/TiO2 BNC films containing 5 wt% of the OC and 5, 10 and 15 wt% of modified TiO2 were prepared via solution intercalation technique. The resulting hybrid materials were subjected to Fourier transform infrared spectroscopy, thermogravimetric analysis techniques and x-ray diffraction. The morphology of the obtained materials was examined by transmission electron microscopy and field emission scanning electron microscopy techniques.