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Showing 1 to 20 of 24 for “"montmorillonite clay"”.
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Investigation of montmorillonite clay-mediated reactions of aldehydes
Montmorillonite clays are employed as effective and environmentally benign heterogeneous catalysts for several reactions of aldehydes: (1) the hetero-Diels-Alder reaction of aromatic aldehydes with 2,3-dimethyl-1,3-butadiene to give dihydropyran products; (2) the cyclotrimerization of aliphatic …
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Preparation and Characterization of a Treated Montmorillonite Clay and Epoxy Nanocomposite
Montmorillonite reinforced polymers are a new development in the area of nanocomposite materials. Since reinforcement of epoxy is important to the development of high strength adhesives and composite matrices, the introduction of montmorillonite to epoxy is of interest. Compositional effects on …
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Charge Interaction Effects in Epoxy with Cation Exchanged Montmorillonite Clay and Carbon Nanotubes.
… of charge heterogeneity in nanoparticles such as montmorillonite layered silicates (MLS) and hybrid systems of MLS + carbon nanotubes was investigated in cured and uncured epoxy. Epoxy nanocomposites made with cation-exchanged montmorillonite clay were found to form agglomerates near a critical …
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Formation of Environmentally Persistent Free Radicals on the Surface of Iron Oxide and Interior of Montmorillonite Clay
… iron (III) oxide, and within cation-rich clays. Plane-wave based ab initio computational methods were used to study the mechanism of formation of EPFRs on the 0001-iron terminated surface of iron (III) oxide, as well as the aqueous interlayer of montmorillonite clay. Phenol was used as the …
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Degradation Of Selected Organic Agrochemicals In Artificial Soil Slurry Systems By Anodic Fenton Treatment
… soil components, such as humic acid, kaolin or montmorillonite clay, and goethite, on the degradation of different groups of agrochemicals, including carbaryl, mecoprop, paraquat, 4.6-odinitrocresol, p-nitrophenol and dinoseb, were studied. The results indicate that humic acid content is the key …
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Moisture diffusion through vinyl ester/clay nanocomposites
… vinyl ester samples containing up to 5 wt% montmorillonite clay; two different kinds of clay surface treatments were employed to make the clay compatible with the vinyl ester resin. These nanocomposites were characterized using differential scanning calorimetry (DSC), mechanical property …
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Mechanistic tracer studies of a synthetic mica-montmorillonite: n-butene isomerizations
… catalytic characteristics of a synthetic mica-montmorillonite clay. The double bond isomerizations (including both double bond migration and rotation, but excluding structural rearrangements of the carbons) of the n-butenes were employed as the probe reactions. Product analyses were performed …
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Controlled release of Isothiazoline biocides from industrial minerals
… from impregnated and non-impregnated minerals. Montmorillonite clay was the best performing mineral in all experiments (adsorption and desorption both from the minerals and paints films, strength of bond analysis, and bioassay). All other minerals tested carried the biocide with varying degree …
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Water vapor diffusion through glass fiber reinforced polymer nanocomposites
… nanocomposites made by addition of nanoclay, reduces the fiber damage and delamination because of its ability to enhance the barrier property of the matrix material. Clay not only acts as a barrier toward moisture diffusion, it also sequesters the moisture and protects the glass surface. …
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Moisture diffusion through neat and glass-fiber reinforced vinyl ester resin containing nanoclay
… vinyl ester samples, both containing up to 5 wt% montmorillonite clay. Transient and steady-state diffusion experiments were carried out with both neat resin as well as glass-fiber reinforced samples. Effect of saline and alkaline solutions on the process of diffusion was studied. It was found …
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The Effect of POSS Modified Montmorillonite On Elastomer Nanocomposites
… structural factors that determine performance in clay/rubber nanocomposites when polyhedral oligomeric silsesquioxane (POSS) is used as a dispersant. POSS has been shown previously to enhance clay, metal oxides, and carbon nanotube dispersion in thermoplastics matrices, but their performance in …
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The development of novel hetrogeneous catalysts for the hydrogenation of prochiral imines
… of the study showed an increase in activity of clay and zeolite supported catalysts when run in 1,1,1-trichloroethane and ethanol, but a drop in activity when benzene was the reaction solvent. Work with imines centred around two homogeneous catalysts. BINAP and DIOP ligands were used to create …
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Supercritical carbon dioxide-processed resorbable polymer nanocomposites for bone graft substitute applications
… by nanostructured, organically modified Montmorillonite clay (nanoclay). scCO<sub>2</sub> processing simultaneously disperses the nanoclay throughout the polymeric matrix, while imparting a porous morphology to the construct conducive to facilitating cellular infiltration and …
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The casing layer in the culture of Agaricus bisporus, the cultivated mushroom
… formula obtained was -.1 part perlite: 1 part montmorillonite clay (by weight): 3 parts 0.01% glucose solution. Perlite/montmorillonite casing could be improved by adding compost colonised by mycelium of A.bisporus, or adding a peat-chalk casing extract. Perlite was also found to be suitable …
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Development of a constitutive model for a heaving clay from Rosebank
Heaving clays are partially saturated soils composed of a high fraction of the montmorillonite clay mineral. When exposed to free water they undergo volumetric expansion, which often results in differential movements at the surface and damage to building structures founded on the clay. The economic …
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Polyethylene-montmorillonite nanocomposites
… and flame retardancy. In order to disperse montmorillonite clay (MMT) into polyethylene(PE), the clay sheets need to be rendered organophilic. Masterbatches with a high level (~40 %wt) of organomodified clay can then be dispersed into a host by a simple mechanical process. Two chemically …
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Hybrid Inorganic-Organic Materials: Novel Poly(Propylene Oxide) Based Ceramers, Abrasion Resistant Sol-Gel Coatings for Metals, and Epoxy-Clay Nanocomposites. With an Additional Chapter On: Metallocene Catalyzed Linear Polyethylene
… steel. In another study, intercalated polymer-clay nanocomposites were prepared based on various epoxy networks montmorillonite clay. This work explored the influence of incorporated clay on the adhesive properties of the epoxies. The lap shear strength decreased with increasing clay content. …
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The Effect of Nanoscale Particles and Ionomer Architecture on the Crystallization Behavior of Sulfonated Syndiotactic Polystyrene
… of the incorporation of nanoscale particles, montmorillonite clay, on the crystallization behavior of SsPS. The morphology of the ionomer clay hybrids were studies via TEM and WAXD while the crystallization behavior of SsPS in the presence of the clay was evaluated using DSC. It was found that …
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The Chemistry of Dimethacrylate-Styrene Networks and Development of Flame Retardant, Halogen-Free Fiber Reinforced Vinyl Ester Composites
… of novolac, bisphenol A diphosphate, and montmorillonite clay were developed and dispersed into the vinyl ester matrix. Cone calorimetry showed reductions in the peak heat release rate comparable to the brominated resin.
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