Open AccessPolymer-iron tungstate-reduced graphene oxide nanocomposites for microwave absorption
Author(s) -
Mr. S. Vamshi Krishna,
S. Balaji,
G. Vadamalai Raj,
P. A. Pravin,
Sathish Kumar M,
Nikhil K. Kothurkar,
Prasanna Ramani,
B Sabarish Narayanan,
Arjun Moorthy
Publication year - 2019
Publication title -
iop conference series. materials science and engineering
Language(s) - English
Resource type - Journals
eISSN - 1757-899X
pISSN - 1757-8981
DOI - 10.1088/1757-899x/577/1/012079
Subject(s) - thermogravimetric analysis , materials science , nanocomposite , fourier transform infrared spectroscopy , polyaniline , differential scanning calorimetry , graphene , polymer chemistry , scanning electron microscope , polyvinyl alcohol , nuclear chemistry , polymer , chemical engineering , composite material , chemistry , polymerization , nanotechnology , physics , engineering , thermodynamics
Three polymers were used in the preparation of three-component nanocomposites. Sulphonated poly(ether-ether-ketone) (SPEEK) was synthesized by sulphonation of powdered poly(ether-ether-ketone) (PEEK) using concentrated sulphuric acid. Polyvinyl alcohol (PVA) was used as purchased. Polyaniline (PANI) was synthesized using aniline, hydrochloric acid and ammonium persulphate. Three nanocomposite films based on SPEEK, PVA and PANI were synthesized through solution casting from N-Methyl-2-pyrrolidone (NMP) solutions with a magnetic filler, iron tungstate (FeWO 4 ) and a conductive filler, reduced graphene oxide (RGO) dispersed in them. The synthesized PANI was characterized by X-ray diffraction (XRD), ultraviolet-visible spectroscopy (UV-vis), Fourier transform infrared spectroscopy (FTIR), thermogravimetric analysis (TGA), differential scanning calorimetry (DSC) and scanning electron microscopy (SEM) and the nanocomposites (RGO/PANI, FeWO 4 /PANI, FeWO 4 -RGO/PANI) were characterized by FTIR, TGA, DSC and SEM. The nanocomposite films based on SPEEK and PVA containing 2% RGO and 2% FeWO 4 showed the electromagnetic interference (EMI) reflection loss of only -0.5 dB for a 0.1 mm thick sample. The PANI based nanocomposite film containing 2% RGO and 2% FeWO 4 showed the maximu m EMI reflection loss of -4.5 dB for a 0.1mm thick sample.