Graft Polymerization Of Aniline Research Articles

Polyaniline In Situ Grafted to Graphene Sheets

Graphene is one of the most promising allotropes of carbon with wide applications in nanotechnology. Modification of graphene by chemical means can further expand its uses. Here, liquid-exfoliated graphene is functionalized with p-aminophenyl moiety using p-nitrophenyl diazonium salts which were diazotized in situ then reduced by tin(II) chloride. The aminophenyl-graphene thus produced is further modified to form polyaniline-graphene (PANI-GNH) by in situ oxidative graft polymerization of aniline using ammonium peroxydisulfate as oxidizing agent. The properties of the PANI-GNH were compared with polyaniline/graphene blends by Raman, infrared and UV-Visible spectroscopy, and cyclic voltammetry. Indeed, PANI-GNH registered different spectrochemical and electrochemical properties compared with the physically blended PANI and GNH, a manifestation of the effect of chemical grafting on the overall property of the modified graphene.

Preparation of Conductive Polyaniline/Functionalized Titanium Dioxide Nanocomposites via Graft Polymerization

Functionalized titanium dioxide nanoparticle (TiO2) with highly reactive isocyanate groups at its surface, which serve as active sites for the graft polymerization of aniline, was prepared via the reaction between toluene-2,4-diisocyanate (TDI) and hydroxyl at TiO2 surface. Conductive polyaniline (PANI) layer was chemically grafted at the surface of the functionalized TiO2 nanoparticle (f-TiO2) surface, resulting in PANI/f-TiO2 nanocomposites. The chemical grafting of PANI was confirmed using FTIR and Thermogravimetric analysis (TGA). The morphology of the PANI/TiO2 nanocomposites was observed by scanning electron microscope (SEM) and transmission electron microscopy (TEM). The amount of grafted PANI is 21 wt%, which was calculated from the results of TGA.

Strong Adhesion and Smooth Conductive Surface via Graft Polymerization of Aniline on a Modified Glass Fiber Surface

The goal of this paper is to prepare surface-conductive glass fibers. The fibers were first hydroxylated, after which they were reacted with 3-bromopropyltrichlorosilane to form a bromopropylsilane monolayer, which was further reacted with aniline to substitute the bromine atoms. The surface-bound aniline molecules were used as active sites for the graft polymerization of polyaniline (PANI). The composition, structure and the morphology of the modified glass fiber surface were examined by X-ray photoelectron spectroscopy, scanning electron microscopy, and Fourier transform infrared spectroscopy. The method generated a smooth and homogenous thin layer of PANI on the surface of the glass fiber with a surface conductivity of about 6 S/cm, hence larger than the usual value (∼1 S/cm) of the bulk polyaniline.

Oxidative graft polymerization of aniline on Si(100) surface modified by plasma polymerization of glycidyl methacrylate

AbstractModification of argon plasma‐pretreated Si(100) surfaces via plasma polymerization of glycidyl methacrylate(GMA), followed by reactive coupling of the epoxide groups of the plasma deposited GMA chains with aniline, and finally by oxidative graft polymerization of aniline was carried out. An alternative approach involved the modification of the argon plasma‐pretreated Si(100) surfaces via plasma polymerization of glycidyl methacrylate(GMA), followed by direct oxidative graft polymerization of aniline and thermal curing. The compositions and chemical states of the modified Si surfaces were characterized by X‐ray photoelectron spectroscopy (XPS). The two methods of surface modification of the Si(100) surfaces produced similar results. The protonation‐deprotonation behavior, the interconvertible intrinsic redox states, and the metal reduction behavior (the electroless plating of Pd from the Pd(II) ion solution) of the grafted polyaniline (PANI) chains on the Si(100) surface were grossly similar to those of the PANI homopolymer. The coupling of PANI to the covalently tethered GMA chains on the Si(100) surface was suggested by the cohesive failure inside the epoxy adhesive that was applied to the modified Si surface in an attempt to peel off the PANI layer from the GMA plasma‐polymerized Si (GMA‐pp‐Si) substrate.

Conductive surface via graft polymerization of aniline on a modified glass surface

A functionalization with an aniline monolayer of a modified glass surface, followed by the surface grafting of polyaniline (PANI) was used to prepare a conductive surface. A bromopropylsilane monolayer was first generated by reacting a hydroxylated surface with 3-bromopropyltrichlorosilane under an inert atmosphere. This layer was functionalized by its reaction with aniline, which substituted the bromide atoms of the silane chain. Further, the tethered aniline molecules were used as active sites for the graft polymerization of PANI on the surface. The composition and microstructure of the PANI-grafted glass surfaces were examined by X-ray photoelectron spectroscopy (XPS), and ultra-violet (UV) spectroscopy, as well as by contact angle measurements. The surface conductivity of the modified glass surface-grafted with PANI was of the order of 10 S/cm, hence, larger than the usual value (∼1 S/cm) of the bulk PANI.