Optical and Structural Study of Polyaniline/Polystyrene Composite Films

Abstract

Summary: Polyaniline (PANI) was synthesized by oxidative polymerization method using potassium dichromate (K 2 Cr 2 O 7 ) as an oxidising agent. X-ray diffraction (XRD) and Fourier transform infrared spectroscopy (FT-IR) results confirm the emerlandine salt formation of PANI. Polystyrene and PANI based composites were prepared by solution cast method. Ultraviolet-visible spectrophotometry (UV-Vis) results of polymer composite film in the range of 200-400 nm indicate the interaction between neighbouring phenyl groups. Structural properties of the composite films were determined by the Fourier transform infrared spectroscopy (FT-IR) and X-ray diffraction (XRD). Morphological changes of PS-PANI film were investigated by scanning electron microscopy (SEM) and optical micrographs.

Steps Toward the Band Gap Identification in Polystyrene Based Solid Polymer Nanocomposites Integrated with Tin Titanate Nanoparticles

“…For example, poly(ethylene oxide) (PEO) has two sharp peaks at 22° and 18°, in addition to several small intense peaks at higher 2θ degrees, and thus it is identified as a semicrystalline polymer [ 2 , 30 ]. Figure 1 exhibits the XRD pattern of pure PS at room temperature where the amorphous nature of the polymer is indicated from the largest specific diffraction peak at 2θ between 15° and 22° [ 29 , 31 ]. Crystal materials are periodically arranged in 3D space; amorphous materials do not have this periodicity, and atoms are distributed randomly in 3D space.…”

“…The PS chains are flexible as there is an allowance of two free rotating phenyl groups around the carbon-carbon bond. The exposure of the samples to the UV increases the absorption over the 280–320 nm range, showing the absorbing photoproduct (i.e., the conjugated double bonds) in the PS [ 29 ]. The addition of nanofillers into the PS resulted in the shifting of absorption to higher wavelengths.…”

“…In previous studies, it has been confirmed that the electron transition properties from the valence band (VB) to the conduction band (CB) can be examined well from tackling the optical properties of the polymer composites [ 27 , 28 ]. The main properties of the polystyrene (PS) polymer, such as facile processability, relatively inexpensive, and mechanical strength, make it to be a strong candidate for the creation of composite films [ 29 ]. The objective of this work is aimed at dealing with the effect of SnTiO 3 NPs on the optical properties of PS-based polymer composite.…”

Plasticizer effect and electronic diffusive behavior of polyaniline‐modified clay in polystyrene nanocomposites

“…In this work, MMT was modified with Pani and used to produce nanocomposites in a polystyrene (PS) matrix by melt intercalation. PS was selected based on former works indicating a good interaction with Pani polymeric chains , which is also interesting to promote exfoliation of the modified nanoclay. Besides, PS is largely used in industry: its mechanical, thermal, and electrical properties are widely known.…”

Electrical behavior of dual‐morphology polyaniline

“…Keeping these points in view, one can easily control or design materials through chemical processing . Polyaniline (PANI) has attracted much attention during the last decade because of its chemical and environmental stability, the presence of reactive NH groups in its polymer chains, and its good electrical conductivity . PANI has three idealized oxidation states: the fully reduced state (leucoemeraldine), the fully oxidized state (pernigraniline), and the partially oxidized state (emeraldine).…”