Microstructural and microwave shielding characteristics of water‐soluble polypyrrole–polyvinyl alcohol–graphite oxide core–shell nanocomposites

Abstract

This article reports on a facile route for the preparation of polypyrrole–polyvinyl alcohol–graphite oxide nanocomposites through the polymerization of pyrrole with different concentration (wt%) of graphite oxide using ammonium persulfate as an oxidant. The synthesized nanocomposites were characterized by Fourier transform infrared spectroscopy, and their surface morphologies were studied by scanning electron microscopy and transmission electron microscopy. Their solubility in water, DC conductivity in solution, and the current–voltage characteristics of the nanocomposites were studied. Furthermore, the microwave absorption at 1.0–10.0 MHz and the effects of sample thickness on the microwave absorption were investigated. The composites including higher concentration of graphite oxide showed increased solubility and electrical conductivity, and high electromagnetic shielding effectiveness. POLYM. COMPOS. 2012. © 2012 Society of Plastics Engineers

High efficient corrosion inhibitor of water‐soluble polypyrrole–sulfonated melamine formaldehyde nanocomposites for 316 L stainless steel

“…The peak situated at 2960 cm −1 is for stretching vibration of C-H groups and the peak at 1325 cm −1 is attributed to the R-NH 2 -CH 2 -group in SMF. 27 The other characteristic peaks observed at 1177 and 1037 cm −1 is related to the asymmetric and symmetric stretching vibration mode of O=S=O for SO 3 − group in SMF. 27,30,7 The peak appears at 1625 cm −1 corresponds to the C=N stretching vibration 4 in SMF and the peaks at 767 and 874 cm −1 are associated with the melamine ring system in SMF 14 respectively.…”

“…Polypyrrole (PPy) has drawn a great significance because of its high electrical conductivity, excellent electronic and optical properties, ease of synthesis, low cost, relatively low density, corrosion protection, long term thermal and environmental stability. 1,2,3,4,5 Besides, PPy has well-known promising for numerous applications such as batteries, supercapacitors, sensors, conductive textiles and fabrics, catalysts, mechanical actuators, anti-static coatings, solid electrolytes, protective coatings for metals, electromagnetic interference (EMI) shielding, artificial muscles, and drug delivery systems. 6,7,8,9 However, PPy shows poor solubility in typical solvents, which arises from the strong inter and intrachain interactions and crosslinkings.…”

Tribological behavior of graphite oxide reinforced polyethersulfone composite under drying sliding condition

“…Among these reinforcement materials, graphite oxide (GO) has attracted considerable attentions owing to its unique advantages of large specific surface area, high thermal conductivity, ultrahigh mechanical strength, and self‐lubrication . In addition to the characteristics mentioned above, GO contains a variety of chemical functional groups (e.g., hydroxyl, carboxyl, carbonyl, and epoxide groups) located on its surfaces and edges . These oxygen‐containing functional groups are favorable to form strong interfacial interaction between GO and polymers, and thereby promoting the efficient stress transfer from polymers to GO.…”

Preparation and characterization of coaxial mullite/polypyrrole fibrous nanocomposites via self‐assembling and in situ surface‐initiated polymerization

“…Conducting electroactive polymers remain a subject of intense investigation of many research groups worldwide. Among conducting polymers composites investigated, polypyrrole (PPy) and its composites are one of the most extensively studied ones, because it possesses highly conductive, oxygen resistant, thermal, and environmental stabilities, relative ease of synthesis and innoxious characteristics, which are favorable for various applications such as metallization of dielectrics , batteries , anticorrosive coatings , shielding of electromagnetic interferences , sensors , actuators , microactuators , etc. However, the typical PPy possesses poor processability, and is insoluble, infusible, and brittle; such problems have limited its potential applications .…”