Effects of organically modified nanoclay on cellular morphology, tensile properties, and dimensional stability of flexible polyurethane foams

Abstract

This article presents a method for the electrochemical preparation of a coating of nickel-silica nanocomposites on a carbon steel substrate. The incorporation of hydrophilic silica particles into the Ni composite coating during co-electrodeposition is so difficult due to the small size and the hydrophilicity of SiO 2 particle, generally less than 2 v% of silica is incorporated into the composite at different current densities, agitation speeds and silica concentrations. The effect of the presence of four surfactants, namely cocamidopropyl betaine (CAPB), decylglycoside (DG), cetyltrimethyl ammonium chloride (CTAC) and ammonium lauryl ether sulfate (ALES), on overcoming this problem was investigated in this research, and the surfactants were found to greatly influence the surface charge of silica, silica incorporation percentage and the microstructure of the composite. In fact, upon increasing the internal stresses, the products prepared in the presence of CAPB and DG were found to crack to some degree. CTAC was found to lead to entrapment mode silica co-deposition in the Ni coating. Furthermore, the addition of ALES into an electrolyte bath negatively supercharged silica surfaces and increased silica dispersion, which led to a dramatic increase in the silica incorporation percentages to around 14 v%. The results showed that Ni-SiO 2 composites prepared in the presence of ALES had better corrosion resistance, hardness and wear properties.

Fabrication and characterization of functional graded polyurethane foam (FGPUF)

“…Then, excess isocyanates react with water in the polyol to produce carbon dioxide. Therefore, addition of isocyanate leads to produce more urethane bands and CO 2 gas leads to grow the cells as a result . All PUF samples were prepared under the same operating conditions.…”

Transparent organic–inorganic nanocomposites membranes based on carboxymethylcellulose and synthetic clay

“…This observation arises from a possible concentration effect of clay at low ratios (Jahanmardi et al, 2013;Ray and Bousmina, 2005), as mentioned before. Another explanation considers the formation of a stacked structure in which the d-spacing value is shift towards high 2Â values, out the detection region of our equipment.…”

Surface modification of sol–gel derived nano zinc oxide (ZnO) and the study of its effect on the properties of styrene–butadiene rubber (SBR) nanocomposites

“…Unquestionably, there has been a growing interest in the field of polymer nanocomposites because of their special property enhancement [7][8][9]. Polymer nanocomposites have the ability to achieve remarkable improvement in the mechanical properties due to the addition of small amounts of nanoparticles into the polymer matrix [7].…”

“…Polymer nanocomposites have the ability to achieve remarkable improvement in the mechanical properties due to the addition of small amounts of nanoparticles into the polymer matrix [7].…”