Modification of magnetic nanoparticles with poly (Vinyl chloride) via click chemistry

A copolymer bearing on its side chain Fe3O4 was bonded to PVC by click reaction via "grafting to" approach. Firstly, propargyl α-bromoisobutyrate was synthesized. Next, vinyltrimethoxysilane and methylmethacrylate copolymerization were completed through Atom transfer radical polymerization. Magnetic nanoparticles (Fe3O4) were bonded to copolymer through its vinyltrimethoxysilane units. Finally, the propargyl end group of the copolymer carrying Fe3O4 on its side chain was bonded to azide PVC by click reaction. The chemical structure and morphology were characterized by FT-IR, 1H, and 13C NMR, SEM, and SEM-EDX. Thermal analysis showed a decrease in the stability of PVC azide compared to PVC and after grafting of the Fe3O4 bond copolymer, the stability increased. The copolymer showed magnetic saturation (Ms) of 41.5 emu/g. The dielectric constant (ε´) and dielectric loss (ε″) of copolymers decreased with an increase in frequency. Propargyl methacrylate was synthesized from propargyl alcohol and methacryloyl chloride. Next, the copolymer was formed via Free radical polymerization of vinyltrimethoxysilane and methylmethacrylate. Fe3O4 was bonded to copolymer via its vinyltrimethoxysilane units. Lastly, the propargyl end group of the copolymer carrying Fe3O4 was bonded to PVC azide by click reaction. FT-IR characterization technique was used. Thermal Stability increased after grafting of Fe3O4 to the copolymer and decreased following click reaction. Fe3O4 bonded copolymer showed Ms of 33.7 emu/g. The ε ´ and ε ″ of copolymers decreases with a frequency increase and for AC conductivity, it increases.