Synthesis and Characterization of Polypyrrole Nanoparticles and Their Nanocomposites with Poly(propylene)

Abstract

, 75 pages Conducting polypyrrole (PPy) nanoparticles were synthesized via microemulsion polymerization system. The characterization of PPy nanoparticles was done by Fourier transform infrared spectrometer (FTIR) and scanning electron microscope (SEM). Nanocomposites were prepared by melt-mixing of polypyrrole with polypropylene (PP) and processed with injection molding. The amount of PPy in nanocomposites varied in the range of 1-20% by weight. The effect of PPy nanoparticles on mechanical, electrical properties and thermal stability of nanocomposites were investigated. Tensile test has revealed that increasing amount of PPy increased the strength and the stiffness of the nanocomposite while limiting the elongation of PP. Thermal gravimetric analysis has showed that incorporation of PPy nanoparticles has improved the thermal stability of the nanocomposites. Four probe conductivity measurement has exhibited that increasing amount of PPy nanoparticles increases the conductivity of nonconductive PP up to 2,4.10-4 Scm-1. In order to improve the dispersion of PPy in PP, sodium dodecylsulphate was used as dispersant. The same techniques were used to characterize nanocomposites containing 2% by weight dispersant. Composites prepared with dispersant have exhibited improvement in some mechanical and thermal properties and involved smaller dimension PPy nanoparticles.

Electrically Conductive Polystyrene/Polypyrrole Nanocomposites Prepared via Emulsion Polymerization

“…PS=PPy composite with 34.63 wt% PPy nanoparticles gave the highest conductivity, 2.18 Â 10 À4 S cm À1 , which is about twelve orders of magnitude higher than that of PS. As can be seen in Figure 3f, the presence of PPy both in nanoparticles and cluster forms support the formation of a stronger conductive network [29,46] .…”

“…Emulsion polymerization technique was used to synthesize PPy nanoparticles, which were later mixed with polypropylene (PP) by melt-mixing to obtain PP=PPy nanocomposites [29] . The blend obtained was processed with injection molding.…”

Morphology control of conducting polypyrrole nanostructures via operational conditions in the emulsion polymerization

“…The peaks at 1550 and 1470 cm −1 can be attributed to the stretching vibrations of CC and CN of PPy, respectively . Furthermore, the peak at 1190 cm −1 corresponds to the breathing vibration of pyrrole ring, and the peak at 780 cm −1 is due to the CH wagging vibration . The shoulder band at 1300 cm −1 is due to the CC in‐ring stretching and CN deformation .…”

Novel electrically conductive polyurethane/montmorillonite-polypyrrole nanocomposites

“…One approach to possibly overcome the above limitations is blending PPy with commercial insulating polymers to produce conductive polymer blends or composites [3,11,27,[29][30][31][32][33]. Among the methods mentioned in the scientific literature, melt mixing offers the advantages of large-scale production and reduced cost which are the bases for any industrial application.…”