D. Morales-Acosta
Radical polymerizationIon exchangeNuclear chemistryCopolymerChemistryPolymer chemistryMaterials scienceSolution polymerizationScanning electron microscopeStyreneDivinylbenzenePolystyreneSulfuric acidAcrylic acidSilver sulfateMembraneChemical engineeringPlatinumBulk polymerizationMetal
Publications 9
Graphene decorated with cooper nanostructures were prepared with and without ionic liquid (IL) using different milling times. The obtained samples were characterized by Raman, X-ray diffraction (XRD) and transmission electron microscopy (TEM), to analyze the effect of the grinding time on the copper particles adhesion to the graphene sheets. Composites of silicon with two contents of G/Cu, at two weight ratios, nanostructures were prepared and the crosslinking characteristics were analyzed by a ...
Abstract Copolymers of styrene-co-acrylic acid were synthesized by radical bulk copolymerization and sulfonated during 3 different periods of time (1, 2 or 3 h). Sulfonation reactions were carried out with sulfuric acid catalyzed with silver sulfate, at a level of 170% of benzene rings theoretically present in the copolymer. Membranes of the sulfonated copolymers were prepared by casting from their THF solutions and then subjected to gamma irradiation treatment at several doses (50, 75 and 100 k...
Abstract Styrene-butyl acrylate (St-BuA) copolymers were obtained by mass free radical copolymerization reactions, using BPO as initiator. A 70:30 (St-BuA) comonomer composition was selected. Three different molar concentrations of sulfonating agent (50, 100 and 150%) were considered to obtain the sulfonated copolymer (sSt-BuA) and membranes were casted from sSt-BuA copolymers. Copolymers were characterized with FTIR, TGA and NMR 1H and mechanically by TMA. The sSt-BuA sulfonation degree (SD) ef...
Abstract The transmembrane reduction, also known as Takenaka-Torikai method, was used as a simplified process to obtain metal-polymer composite membranes useful in fuel cells. The method involves a device consisting of a cell with two separated compartments, divided by the ion exchange membrane to be modified. Once the reductor from one compartment diffuses through the membrane, reach the precursor solution, on the other compartment, reducing it to metallic platinum particles. Membranes were pre...
Abstract Two copolymers of poly(styrene-co-acrylic acid) (PS-AA) were synthesized in solution by radical polymerization and partially crosslinked by adding, either trimethylol propane trimethacrylate (TMPTMA) or divinylbenzene (DVB) to improve mechanical resistance. Copolymers were sulfonated with theoretical molar quantities of sulfuric acid (H2SO4 = 170%) and two different amounts of silver sulfate (Ag2SO4 = 0.11 or 0.055%). Materials were dissolved in three different solvent compositions: cop...
#2D. Morales-AcostaH-Index: 2
Graphene has been gained increasing attention of the scientific community due to its many beneficial properties. One of the most promising applications is as electrode material for the production of energy in Fuel Cells and Lithium-ion batteries. The electrochemical synthesis of graphene oxide provides a facile, fast, scalable, economic and environmental friendly pathway to the production of graphene flakes. In this work, we analyze the properties of electrochemical exfoliated graphite using dif...
Sulfonated styrene-acrylic acid copolymers have been used as an alternative polyelectrolyte membrane for applications in fuel cells. In this work, the raw copolymer has been prepared by a well studied solution copolymerization reaction method, but at two different capacity reactor conditions: 100 mL and 3 L. The main idea was to scale up the copolymer production for having enough material for future sulfonation reactions. The reaction conditions consisted of styrene/acrylic acid in a 94/6 % mol,...
The synthesis of two random copolymers was carried out by radical copolymerization. Poly(styrene-co-acrylic acid) in a 94:6 (St:AA) molar ratio, partially cross-linked with trimethylol propane trimethacrylate was synthesized by mass polymerization and then sulfonated (PSAAS-m) with sulfuric acid. On the other hand, the same random PSAA was synthesized by solution polymerization, but cross-linked with divinylbenzene and then sulfonated (PSAAS-s). Copolymers, including non sulfonated controls, wer...
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