Abstract
The aims of this study, firstly, to obtain high degree of clay exfoliation in the epoxy matrix by three dispersion methods such as normal mixing, shear mixing, and high-speed mixing and, secondly, to investigate corrosion behavior of epoxy/organoclay nanocomposite, immersion test, weight change, and penetration behavior were conducted. From the three mixing methods, the high-speed mixing method showed larger clay interlayer distance, smaller clay aggregate, and more homogeneity and expectedly resulted in high anticorrosive properties. Penetration depths of these nanocomposites showed a small difference; however, the most noticeable improvements in anticorrosion performance for epoxy/organoclay nanocomposites under high-speed mixing method were found to reduce penetration and weight uptake which are described via the model of nanoparticulate-filled structure and discussed in corrosion protection mechanism against environmental liquid penetration.
Highlights
Polymer-layered silicate nanocomposites (PLSNs), materials consisting of a polymer matrix reinforced with inorganic nanoparticles, are an expanding field of study due to unexpected improvement on mechanical, thermal, and barrier properties over conventional unfilled polymer resins
These results show two considered pieces of information: firstly, organoclay is significantly intercalated by epoxy resin, and secondly, due to the high degree of shear involved the breakup of large clay galleries into smaller ones took place and therefor increased clay interlayer distance
Mixing method of epoxy nanocomposites plays an important role in clay dispersion in epoxy resin and is a main key parameter of epoxy/organoclay nanocomposites in the improvement of corrosion performance such as weight change, penetration depth, penetration profile and size of penetration depth
Summary
Polymer-layered silicate nanocomposites (PLSNs), materials consisting of a polymer matrix reinforced with inorganic nanoparticles, are an expanding field of study due to unexpected improvement on mechanical, thermal, and barrier properties over conventional unfilled polymer resins. At a loading of only 4.7 mass% of clay, the modulus is raised by 40%, the strength is increased by 50%, and the heat distortion temperature is increased by 80◦C compared with the neat polymer, respectively. The key to this extraordinary performance of nylon 6-clay hybrids is the complete dispersal (exfoliation) of the clay nanolayers in the polymer matrix
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