http://biblioteca.universia.net/searchAutor.do?q=Yazdani%20Pedram,%20M. Resultados 1 - 10 de 36 de Yazdani Pedram, M.. (0,11 segundos) es http://biblioteca.universia.net/img/logotipo.jpg http://biblioteca.universia.net/ http://biblioteca.universia.net/ficha.do?id=38187556 Polypropylene (pp) was functionalized in the melt phase by grafting with itaconic acid derivatives. 2,5-dimethyl-2,5-bis(tert-buthyl-peroxy) hexane (lupersol 101) was used as radical initiator. A Brabender Plasticorder was used for all the experiments. The optimum conditions for the grafting reaction were 190 degreesC, 75 rpm and 6 min. The itaconic acid derivatives used in this work were mono- and dimethyl esters. When dimethyl itaconate (DMI) was used as functional polar monomer, a maximum ... Yazdani-Pedram, M.; Vega, H.; Quijada, R. http://biblioteca.universia.net/ficha.do?id=47763318 A large number of carboxylic groups were introduced onto chitosan by grafting with poly(acrylic acid) as an efficient way of modification. The reactions were carried out in a homogeneous aqueous phase by using potassium persulfate and ferrous ammonium sulfate as the combined redox initiator system. The efficiency of grafting was found to depend on monomer, initiator, and ferrous ion concentrations as well as reaction time and temperature. It was observed that the level of grafting could be co... Yazdani-Pedram, M.; Retuert de la Torre, Jaime http://biblioteca.universia.net/ficha.do?id=47763324 Polymeric liquid membranes are prepared using 3-nitro-o-xylene (NOX), tri-butylphosphate (TBP), bis-(2-ethylhexyl) sebacate (DOS), o-nitrophenyloctyl ether (o-NPOE), tris-2-ethylhexylphosphate (TEHP), dioctylphthalate (DOP) and dibutylphthalate (DBP) as plasticizers, and they have been used as sensors for nitrate ion, employing tri-octylmethyl ammonium chloride (TOMACI) as ionosphere and poly(vinyl chloride) (PVC) as matrix. The sensors showed Nernstian slopes with values of the practical det... Arada Pérez, María de los Angeles; Yazdani-Pedram, M. http://biblioteca.universia.net/ficha.do?id=47763325 Hybrid nanocomposites based on siloxane sols, chitosan and poly(monomethyl itaconate) (PMMI) as organic polymer counterparts were prepared. Tetraethyl ortosilicate was used as inorganic network fort-ning reagent that was first transformed into soluble polymeric species by acid catalyzed hydrolysis and condensation reactions. The siloxane sol was then mixed with different amounts of PMMI and chitosan at room temperature to form the hybrid material. These hybrid materials could be easily cast a... Martínez, Y.; Retuert de la Torre, Jaime; Yazdani-Pedram, M. http://biblioteca.universia.net/ficha.do?id=38184148 The use of grafted poly(propylene) (PP) and a random copolymer of ethylene and propylene (EPR) with an itaconic acid derivative, monomethyl itaconate (MMI), as compatibilizer for PP/EPR blends was analyzed. The grafting reaction was performed at 190degreesC in a Brabender Plasticorder. 2,5-Dimethyl-2,5-bis (tert-butylperoxy) hexane was the radical initiator for the functionalization of PP, dicumyl peroxide was used as the radical initiator for the modification of EPR. The obtained degree of g... Yazdani-Pedram, M.; Quijada, R.; López Manchado, M. A. http://biblioteca.universia.net/ficha.do?id=44127928 A potentiometric all-solid-state type ion-selective electrode (ISE) for NO3- was constructed and characterized. It is based on a mixture of tetra-decyl-ammonium nitrate (TDAN) as ionophore, di-butyl phthalate (DBP) as plasticizer and poly (vinyl chloride) (PVC) as matrix. Nitrate concentrations in tomatoes samples, randomly collected from central market at Santiago de Cuba, were determined using the described ISE by standard addition potentiometry. Spectrophotometric determinations using Bruc... Arada, M. A.; Cortés Nodarse, I.; Yazdani-Pedram, M. http://biblioteca.universia.net/ficha.do?id=38184139 Functionalized metallocene copolymers synthesized from ethylene with 5-hexen-1-ol and ethylene with 10-undecen-1-ol were used as compatibilizers in LDPE/starch and LDPE/dextran blends in order to improve the interfacial adhesion between hydrophobic LDPE and hydrophilic natural polymers. An increase in tensile modulus and a slight decrease in tensile strength was observed when poly [ethylene-co-(10-undecen-1-ol)] was added to a 70:30 wt.-% LDPE/dextran blend, whereas the addition of poly[ethyl... Domínguez Barceló, Ana María; Quijada, R.; Yazdani-Pedram, M. http://biblioteca.universia.net/ficha.do?id=38184144 The mechanical, morphological behavior and water absorption characteristics of polypropylene (PP) and silica, or PP and rice-husk, composites have been studied. The silica used in this study as filler was a commercial type produced from soluble glass or rice husks. The compatibilizing effect of PP grafted with monomethyl itaconate (PP-g-MMI) and/or with vinyltriethoxysilane (PP-g-VTES) as polar monomers on the mechanical properties and water absorption was also investigated. In general, a hig... Toro, P.; Quijada, R.; Murillo, O.; Yazdani-Pedram, M. http://biblioteca.universia.net/ficha.do?id=38184145 The formation of polymeric hybrid materials of siloxanes with gelatin (GE) starting from sodium metasilicate as the silica source, and their transformation into silica under different conditions have been studied. Gelatin/silicate hybrid nanocomposites were obtained by acid precipitation of mixed gelatin and sodium silicate solutions. Porous xerogels with large BET areas (452 m(2)/g) constituted by closed packed microspheres (1 mum diameter) containing residual gelatin in microporous domains ... Retuert de la Torre, Jaime; Martínez, Y.; Quijada, R.; Yazdani-Pedram, M. http://biblioteca.universia.net/ficha.do?id=38184146 Homogeneous transparent hybrid films consisting of chitosan (CHI), poly(monomethyl itaconate) (PMMI) and silica were obtained indicating the absence of microphase separation. These ternary hybrid materials are very interesting since materials with high functionality can be obtained presenting different properties from those of the starting materials but with the advantage of preserving the inherent property of each component. The inorganic phase was prepared by sol-gel process of tetraethoxys... Martínez, Y.; Retuert de la Torre, Jaime; Yazdani-Pedram, M.; Colfen, H.