Abstract
In this study, the goal was the preparation, characterization, and surface morphology of poly(amide-imide)/TiO2-citric acid nanocomposites (PAI/TiO2-CA NCs). Owing to the high surface energy and tendency for agglomeration, the surface of TiO2 nanoparticles was modified with citric acid. Then poly(amide-imide) was synthesized by direct polycondensation reaction of N,N′-(pyromellitoyl)-bis-L-leucine diacid with 4,4′-diaminodiphenylmethane by triphenyl phosphite and tetra-n-butylammonium bromide as a green medium. The attained polymer and modified TiO2 nanoparticles were used to prepare PAI/TiO2-CA NCs through ultrasonic irradiation. The resulting PAI/TiO2-CA NC was characterized with FT-IR spectroscopy, X-ray diffraction, field emission scanning electron microscopy, transmission electron microscopy, and thermogravimetric analysis.
Notes
a Temperature at which 5% weight loss was recorded by TGA at heating rate of 20°C/min under an argon atmosphere.
b Temperature at which 10% weight loss was recorded by TGA at heating rate of 20°C/min under an argon atmosphere.
c Weight percentage of material left undecomposed after TGA analysis at a temperature of 800°C under an argon atmosphere.
d Limiting oxygen index (LOI) evaluating char yield at 800°C.
Color versions of one or more of the figures in the article can be found online at www.tandfonline.com/gpac.