Montmorillonite
Mostrando 13-24 de 159 artigos, teses e dissertações.
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13. Effects of the Structure and Composition of Montmorillonite on the Dimerization of Unsaturated Fatty Acids
The effects of structure and composition of different montmorillonites on their catalytic performance in the dimerization of unsaturated fatty acids were investigated. The dimerization reaction was performed at 240 ºC for 3 h, with montmorillonite as catalyst, and LiCl as the co-catalyst. The results showed that the specific surface areas of the different m
J. Braz. Chem. Soc.. Publicado em: 2018-07
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14. Preparation, Characterization and Photostability of Nanocomposite Films Based on Poly(acrylic acid) and Montmorillonite
Polyacrylic acid (PAA)/clay mineral (SWy-1) nanocomposites were prepared by intercalation in solution and their photostability was evaluated. For the nanocomposite films containing 5, 10 and 20 wt % in SWy-1 mass occurred intercalation along with some clay exfoliation, while for PAA/30%SWy-1, the intercalation of PAA chains into the clay interlayers was obse
Mat. Res.. Publicado em: 07/05/2018
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15. Evaluation of Biopolimeric Films of Cassava Starch with Incorporation of Clay Modified by Ionic Exchange and its Application as a Coating in a Fruit
Coatings technologies with biopolymeric films are effective in maintaining the chemical and sensory characteristics of several fruits. Cassava starch is an attractive biopolymeric because of its renewable characteristics and low cost, but it has a high transfer rate of water vapor. Hydrophilic compounds of organically modified montmorillonite clay by ion exc
Mat. Res.. Publicado em: 22/01/2018
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16. Optical Properties of Blown Films of PA6/MMT Nanocomposites
In this work blown films of polyamide 6 (PA6) nanocomposites were produced at different processing conditions, with the addition of montmorillonite (MMT), pure and surface modified by an organic salt. The films' optical properties were evaluated according to ASTM D-1003 and the results correlated with the degree of crystallinity, nanoparticle's dispersion st
Mat. Res.. Publicado em: 23/10/2017
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17. Preparation of Zinc Oxide-Nanoclay Hybrids by Alkaline Ion Exchange Method
Abstract ZnO/nanoclay hybrids are synthesized by a single-step solid-state reaction using ZnCl2 as a reagent. These hybrids were prepared by a simple alkaline ion exchange method, without using any surfactant or chelating agents. By adjusting the reagent’s immersion time in molten salt, production of pure ZnO/nanoclay hybrids was achieved. Synthesized hybr
Braz. J. Chem. Eng.. Publicado em: 2017-10
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18. Influência da temperatura de molde associada com o uso de fibra de vidro nas propriedades mecânicas e térmicas do nanocompósito (PA6/FV/MMT)
ABSTRACT This work describes the second of a series of studies of the effects of injection molding conditions on the mechanical and thermal properties of Polyamide 6/Glass Fiber/Montmorillonite (PA6/GF/MMT) composites and was motivated by the lack of information about how the processing variables influence on the properties of three-phase composites containi
Matéria (Rio J.). Publicado em: 11/05/2017
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19. Effect of an Organo-Modified Montmorillonite on the Barrier Properties of PET Nanocomposites Using a Polyester Ionomer as a Compatibilizing Agent
Poly(ethylene terephthalate)/organically modified montmorillonite (PET/o-Mt) nanocomposites were prepared via melt intercalation in a twin-screw extruder using a polyester ionomer (PETi) as compatibilizer. The o-Mt content used was 0, 1, 3 or 5 wt% and the compatibilizer/o-Mt mass ratio was 0/1, 1/1 or 3/1. The main objective was to study the effects of the
Mat. Res.. Publicado em: 09/05/2017
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20. Nanocomposites films obtained from protein isolates of mechanically deboned chicken meat added with montmorillonite
Abstract The aim of this study was to evaluate the properties of nanocomposite films of protein isolates from mechanically deboned chicken meat with organoclay (montmorillonite). For the film development, a 23 experimental design was performed with three levels, protein isolate (2, 3.5, 5 g.100 mL-1 of solution), montmorillonite (0.3, 0.5, 0.7 g.100mL-1 of s
Polímeros. Publicado em: 2017-03
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21. Hybrid Membranes of Polyamide Applied in Treatment of Waste Water
In this work, it was prepared hybrid membranes of polyamide6 (PA6) with montmorillonite (MMT) and porogenic agent (CaCl2). The hybrid membranes with CaCl2 were characterized by X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), differential scanning calorimetry (DSC), scanning electron microscopy (SEM), porosimetry by mercury intrusion
Mat. Res.. Publicado em: 16/01/2017
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22. Atmospheric Pressure Continuous Production of Solketal from the Acid-Catalyzed Reaction of Glycerol with Acetone
A continuous-flow process at atmospheric pressure was designed for the conversion of glycerol to solketal, an oxygenated fuel additive, through the acid-catalyzed reaction of glycerol with acetone. Process optimization was performed by checking the influence of different variables on the conversion and selectivity. The variables examined were: residence time
J. Braz. Chem. Soc.. Publicado em: 2016-10
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23. Confinement of a Nonionic Surfactant Membrane Within a Montmorillonite as a New Way to Prepare Organoclay Materials
The aim of this study was to prepare and characterize a hybrid layered material (organoclay) with a Na-montmorillonite and the triethylene glycol mono-n-decyl ether (C10E3) nonionic surfactant which forms a lamellar phase at room temperature. The synthesized organoclay was characterized by complementary techniques (Fourier transform infrared spectroscopy and
Mat. Res.. Publicado em: 29/09/2016
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24. Adsorption of Silver (I) From Aqueous Solution Using Chitosan/Montmorillonite Composite Beads
Chitosan/montmorillonite (CTS-MMT) composite beads were used as adsorbents for the removal of silver ion (Ag+) from aqueous solution. Equilibrium adsorption was achieved within 150 min at 3% MMT of chitosan solution. The optimum pH value for Ag+ removal was found to be 6-7. The maximum adsorbent dosage for Ag+ removal was 5 g/L. Under above maximum condition
Mat. Res.. Publicado em: 22/08/2016