In this investigation, citric acid (CA) and ascorbic acid (AA) as biocompatible and biodegradable coupling agents were grafted onto surface of Al 2 O 3 nanoparticles (NP)s via ultrasonic process. Then, various percentages of the modified Al 2 O 3 NP were immobilized onto matrix of pristine poly(vinyl alcohol) (PVA) and ameliorated their morphology, mechanical and thermal properties. Transmission electron microscopy photographs were valid criterion for characterizing morphology of Al 2 O 3 with CA and AA. The improvement of the mechanical properties revealed good dispersion of the modified Al 2 O 3 into the matrix of PVA. Finally, thermogravimetric analysis curves displayed an increase in the thermal stability of the nanocomposites upon grafting of the modified Al 2 O 3 .
ABSTRACT:In this research, the preparation of nanocomposites (NCs) containing nonaggregated nanoparticles (NPs) was studied. Alumina NPs were functionalized by two coupling agents, citric acid and ascorbic acid. NCs of poly(vinyl chloride) (PVC) doped with varying amounts of modified Al 2 O 3 NPs were synthesized via the ultrasonication method. The X-ray diffraction confirmed that the structure of the modified Al 2 O 3 NPs was still preserved in a pure crystalline phase with the hexagonal structure. Surface morphology showed a picturesque network structure due to the existence of hydrogen bonds in the modified Al 2 O 3 . It also proved good dispersion of NPs in the polymer matrix in nanoscale. C
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