Fabrication of a novel magnetic nanocomposite based on 3d crosslinked poly (acrylic acid) and carboxylated cellulose nanocrystal

Abstract

In this research, synthesis and characterization of a new magnetic nanocomposite based on 3D crosslinker and carboxylated cellulose nanocrystal have been carried out. The magnetic particles are directly linked with the polymer chain by strong covalent bond. A highly reactive site containing 3D crosslinker was introduced for the linking between the magnetic particles and the polymer chain. Magnetic iron oxide nanoparticle (MION) was synthesized via co-precipitation method and then coated with silica. This silica coated MION was further functionalized by amino group followed by incorporation of acrylic group. The synthesized product acted as 3D crosslinker with the reactive acrylic group on the surface. The 3D crosslinking achieved by using this crosslinker made the polymers more robust due to the presence of enormous number of active sites on a single component. The dispersive property of the nanocomposite was increased by incorporation of highly dispersive carboxylated cellulose nanocrystal which was extracted from sawdust by acid hydrolysis process followed by 2, 2, 6, 6-tetramethylpiperidin-1-oxyl (TEMPO)-mediated oxidation. The synthesized nanocomposite was characterized by x-ray photoelectron spectroscopy (XPS), x-ray diffraction (XRD), energy dispersive x-ray (EDX), field emission scanning electron microscopy (FE-SEM), thermogravimetric analysis (TGA) and fourier transform infrared (FTIR) analysis. From FE-SEM study it was found that the size of the particle of the nanocomposite was 60-90nm. The chemical functionalities were characterized by XPS and FTIR which was relevant to the corresponding components. TGA study showed the magnetic nanocoomposite was highly thermo stable.