Preparation and characterization of optically active poly(amide-imide)/TiO2 bionanocomposites containing N-trimellitylimido-L-isoleucine linkages: using ionic liquid and ultrasonic irradiation

Abstract

In the present investigation, novel poly(amideimide)/TiO 2 bionanocomposites containing L-isoleucine moiety in the main chain were prepared via a simple and inexpensive ultrasonic irradiation process. Poly(amide-imide) as a source of polymer was synthesized by direct polycondensation reaction of N-trimellitylimido-L-isoleucine with 4,4′-diaminodiphenylsulfone in the tetrabutyl ammonium bromide/triphenyl phosphite as a green solvent system. Due to the high surface energy and tendency for agglomeration, the surface of TiO 2 nanoparticles was modified with γ-aminopropyltriethoxyl silane. The resulting hybrid bionanocomposites were fully characterized by FT-IR spectroscopy, UV-vis spectroscopy, X-ray diffraction, field emission scanning electron microscopy, transmission electron microscopy (TEM) and thermogravimetric analysis. Through TEM photographs, it can be found that the surface modified TiO 2 nanoparticles with diametric size of less than 40 nm, uniformly dispersed in the obtained PAI matrix.

A review of current coupling agents for modification of metal oxide nanoparticles

“…Also the surface of TiO 2 NPs modified with KH550 [99][100][101]. In another study, Mallakpour and Dinari [102] reported the modification of Al 2 O 3 with KH550 coupling agent.…”

A novel conducting nanocomposite obtained by p‐anisidine and aniline with titanium(IV) oxide nanoparticles: Synthesis, Characterization, and Electrochemical properties

“…For TiO 2 nanoparticle, the broad peak at 3,449 cm 21 corresponds to stretching motions of the surface hydroxyl or the adsorbed water and the peak at 1,634 cm 21 corresponds to vibration of OAH bonds on the TiO 2 nanoparticles surface. The broad band observed in the region 825 cm 21 corresponds to TiAO stretching peak [28].…”

Preparation of water‐soluble electrical steel coating with SiO2 modified by glycine

“…The compatibility between water‐soluble resin and nano‐particle was a problem for the water‐based composite electrical steel coating. So it is a great chance to deal the problem, as a result the nano‐particles were always modified to enhance the compatibility , such as modified by silance coupling agent , titanate coupling agent, or grafted by polymer . In the present paper, glycine was used to graft the SiO 2 nano‐particles in the study, and the compatibility between the polyester solvent and the SiO 2 particles was enhanced.…”