A facile preparation method for synthesis of silica sulfuric acid/poly(o‐methoxyaniline) core–shell nanocomposite

Abstract

A new nanocomposite of poly(o-methoxyaniline) (POMA) is introduced by overlayer formation of POMA on silica.The key appealing feature of the synthesis is the role of silica sulfuric acid (SSA) both as solid acid dopant and template in overlayer self-assembly of POMA on silica surface. Hereon siloxide group (Si-O À ) of silica surface is replaced with dopant anion of SSA (≡Si-O-SO 3 À ), which leads to formation of a overlayer of POMA on the silica surface. The composite particles are spherical in the nanoscale range of 50 nm without application of any external template (notemplate synthesis). Nanocomposite was fully characterized by various instrumentation methods: Fourier transform infrared (FT-IR), ultraviolet-visible (UV-vis), thermogravimetric analysis (TGA), diffrential thermal analysis (DTA), elemental analysis (CHNS), energy dispersive X-ray (EDX), X-ray photoelectron spectroscopy (XPS) and X-ray difraction (XRD). Based on XPS and CHNS results, it is demonstrated that the doping level of POMA is as high as 50% and for the first time the ratio of 4:2:2 is obtained for -NH-(amine): -HN .+ -(polarons): ¼HN + -(bipolarons), respectively. In fact, bipolarons may also coexist with polarons with a 1:1 ratio of them. Moreover, the synthesis benefits from the perspective of green chemistry which is preparation under solid-state (solvent-free) condition.

The effect of initiators and oxidants on the morphology of poly [(±)‐2‐(sec‐butyl) aniline] a chiral bulky substituted polyaniline derivative

“…[1][2][3][4][5][6] Moreover, microstructure and nanostructure polyaniline attract considerable attention in material science. [3][4][5][6][7] Substituted polyanilines overcome the insolubility of polyaniline in common solvents and difficulties in its processing that limits industrial applications of polyaniline. [1][2][3][4][5] Polyanilines that have been substituted by alkyl or alkoxy chains or polar substituents are soluble in both organic and aqueous solvents and therefore improve the processing problems.…”

Solid-state synthesis of a new core-shell nanocomposite of polyaniline and silica via oxidation of aniline hydrochloride by FeCl3.6H2O

“…Different inorganic fillers such as metal oxides (Fe x O y , TiO 2 , SiO 2 , WO 3 , etc. ), metals (Au, Ni, Ag, etc. ), and clays have been applied in building block of PANI to require the desired mechanical, electrical, and chemical properties in the final composites and nanocomposites .…”

“…), metals (Au, Ni, Ag, etc. ), and clays have been applied in building block of PANI to require the desired mechanical, electrical, and chemical properties in the final composites and nanocomposites . However, among the numerous composites based on reviewed inorganic fillers, silica/PANI composites have attracted great academic interest because silica not only improve the mechanical and thermal properties of composite but also exhibit some interesting properties.…”

“…However, among the numerous composites based on reviewed inorganic fillers, silica/PANI composites have attracted great academic interest because silica not only improve the mechanical and thermal properties of composite but also exhibit some interesting properties. Scientists introduced new industrial application of this type of composite in electronic and optical packaging, optical devices, coatings, pharmaceutical, membranes, sensors, structural ceramics, chromatographic columns, etc …”

“…Although according to theoretical calculations bipolaron state is more favored than the polaron, it has been accepted that polarons as charge carriers are responsible for the conductivity of PANI. Others reported the thermodynamic equilibrium between bipolaronic and polaronic form …”