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Colecciones en esta comunidad
Material subido recientemente.
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Intelligent insulin pump design
(2018)Diabetes Mellitus is a disease produced by a lack of insulin. In human beings, if insulin is not given externally, glycemia cannot be regulated correctly. According to several studies, tight control of glycemia reduces the ... -
Starch Polyvinyl Alcohol blends containing Polyurethane as plasticizer
(2016)Starch-based films containing 70wt% of starch and a combination of poly(vinyl alcohol) and a low glass transition temperature polyurethane as plasticizer were prepared. The effect of PVA/PU ratio content on the morphology ... -
Influence of dynamic crosslinking on the morphology, crystallization, and dynamic mechanical properties of PA6,12 EVA blends
(2016)This study investigated the effect of dynamic crosslinking of polyamide 6,12 and random copolymers of ethylene and vinyl acetate blends (PA6,12/EVA) on the morphology, crystallinity, and dynamic mechanical properties. The ... -
Chitosan-graft-poly(n-butyl acrylate) copolymer Synthesis and characterization of a natural synthetic hybrid material
(2016)Two chitosan polymers with different deacetylation degree and molecular weight were subjected to graft- ing reactions with the aim to enhance the properties of these bio-based materials. Specifically, n-butyl acrylate in ... -
On the strategies for incorporating nanosilica aqueous dispersion in the synthesis of waterborne polyurethane silica nanocomposites, Effects on morphology and properties
(2016)In this work the synthesis of waterborne polyurethane/nanosilica nanocomposites by using two differ- ent strategies is presented, starting from a vinyl terminated polyurethane prepolymer (PUP) based on isophorone diisocyanate ... -
Morphology and properties of neutralized chitosan-cellulosenanocrystals biocomposite films
(2016)Chitosan/cellulose nanocrystals (CH-CN) films were obtained by casting of dispersions, and treated with NaOH for neutralization proposes. The composition of films was varied from 1 to 10 wt.% of CN. Changes in the morphology ... -
Synthesis, characterization and swelling behavior of new pH-sensitive hydrogels derived from copolymers of 2-hydroxyethyl methacrylate and 2-(diisopropylamino) ethylmethacrylate
(2012)The aim of this work was to synthesize and to characterize new pH-sensitive hydrogels that can be used in the controlled release of drugs, useful for dermal treatments or ophthalmology’s therapies. Copolymers containing ... -
Surface, thermal, and mechanical properties of composites and nanocomposites of polyurethane PTFE nanoparticles
(2014)Films from blends of polyurethane and nano-polytetrafluoroethylene aqueous dispersions (PU/nanoPTFE) were prepared, and the effect of the addition of different amounts of PTFE nanoparticles (50 nm) was studied. The changes ... -
Synthesis and swelling behavior of pH-responsive polyurethane poly(2-(diethylamino)ethyl methacrylate) hybrid materials
(2013)Polyurethane (PU)/poly[2-(diethylamino)ethyl methacrylate] hybrids, having a chemical bond between the PU and acrylic moieties and with different compositions, were prepared by the dispersion polymerization of 2-(diethyl ... -
The role of nanocrystalline cellulose on the microstructure of foamed castor-oil polyurethane nanocomposites
(2015)Nanocrystalline cellulose (CNC), obtained by sulphuric acid hydrolysis, was used to synthesize polyurethane foams (PUFs) based on a functionalized castor oil polyol and a Methylene diphenyl diiso- cyanate (MDI). Formulations ... -
Polyurethane Poly(2-(Diethyl Amino)Ethyl Methacrylate) blend for drug delivery applications
(2015)A pH-sensitive blend of polyurethane (PU) and poly(2-(diethyl amino)ethyl methacrylate (PDEA) with good film-forming capacity was prepared from the corresponding aqueous dispersions. The polymer matrix was first characterized ... -
Effect of antioxidant active films on the oxidation of soybean oil monitored by Fourier transform infrared spectroscopy
(2014)An active film prepared from waterborne polyurethane incorporated with different concentrations of butylated hydroxytoluene (BHT) and a-tocopherol was developed, and the films’ antioxidant character- istics were studied ... -
Evaluation of pH-sensitive polyurethane 2-diethylaminoethyl methacrylate hybrids potentially useful for drug delivery developments
(2015)Smart sensitive polymers have been used to improve processes in drug delivery. In this article, we evaluate the behavior of polyurethane/N,N-diethylaminoethyl methacrylate hybrids (PU/DEA) as pH- responsive polymers ... -
Evaluation of pH-sensitive poly(2-hydroxyethyl methacrylate-co-2- (diisopropylamino)ethyl methacrylate) copolymers as drug delivery systems for potential applications in ophthalmic therapies ocular delivery of drugs
(2015)Smart polymers like pH sensitive systems can improve different pharmacological treatment. In this work the behavior of copolymers containing 2-hydroxyethyl methacrylate (HEMA) with different proportions of 2-(diisopropyl ... -
Flame retardant systems based on alkoxysilanes for wood protection
(Intech, 2017)The aim of this study was to formulate, develop, and determine the performance of flame-retardant systems for wood protection. Flame-retardant systems involve wood impregnation and intumescent coating application. The ... -
Introductory chapter : Protection of materials
(Intech, 2017)The science and technology of materials have as objective provided access to specific knowl- edge in this field and besides generated matters of interest for the development of original researches leading to new materials ... -
Impregnación de maderas de baja densidad con hidrofugantes organosilícicos
(2017)En este trabajo se estudiaron las propiedades de madera de Araucaria angustifolia modificada químicamente por impregnación con alquilalcoxisilanos con diferente longitud de cadena hidrocarbonada, hidrolizados y condensados ... -
Los entornos virtuales como complemento empírico de enseñanza en ingeniería
(CAQ, 2016)Este trabajo distingue el uso de las TICs como concepto de entorno virtual de experimentación y específicamente como laboratorio virtual aplicado al proceso de enseñanza-aprendizaje para alumnos de Ingeniería especialidad ... -
Enseñanza de química para el nivel secundario en el laboratorio de la universidad en el marco de la articulación educativa. Del saber al hacer
(JEQUSST, 2015)En este trabajo se elaboró y puso en marcha como propuesta una estrategia pedagógico didáctica afianzando la vinculación de los alumnos del Colegio Secundario con el ámbito de la Universidad. Bajo este contexto, el apoyo ... -
Articulación nivel medio universidad : el laboratorio de química como nexo elector de una carrera de ingeniería
(CIECIBA, 2018)La formación básica desigual de los estudiantes que ingresan a una carrera universitaria, ya sea por la calidad diferencial de las propuestas de las instituciones de origen o por condiciones propias de cada individuo, ...