Synthesis, characterization and electrical properties of novel conducting copolymer-nanocomposites via minimemulsion polymerization technique

ABSTRACT

A novel conducting copolymer nanocomnosites based on styrene [St]/maleic acid [MA] in presence of different carbon black [CB] percent ratios [1%, 3% and 5%] have been successfully synthesized via miniemulsion polymerization technique. A new method for the preparation of stable copolymer nanoemulsion composites of St/MA/CB via miniemulsion polymerization using high energy emulsitication technique by an equipment such as homogenizer. poly vinyl alcohol [PV A]/Sodium dodecyl benzene sulphonate [SDBS] as coemulsifiers and potassium persulphate [KPS] as an initiator. The polymerization reactions were done through 4 hr at 70°C. The indium and indium tin complexes of St/MA/CB copolymer nanotmulsion composites were also prepared. As a result, the pure II1dium oxide and indium/tin oxide nano-particles are finely dispersed through the polymeric matrix to have an intimate interactions with the -COOH functional groups present in the copolymer nanocomposite. The obtained copolymer nanocomposites and their complexes were subjected to characterization via spectrophotometric measurements such as FT-IR, TEM and XRD analysis. The dc-electrical conductivity and Ac- electrical conductivity for the prepared copolymer nanocomposites and their complexes were investigated and gave promising results. The indiumcopolymer nano composite [In-St/MA/CB] gave us excellent results compared to those of traditional conducting polyanilines and showed higher electrical conductivity than those of St/MA/CB copolymer nanocomposites