Eduardo Mendizabal

Eduardo Mendizabal
University of Guadalajara | UDG · Departamento de Química

PhD

About

166
Publications
68,263
Reads
How we measure 'reads'
A 'read' is counted each time someone views a publication summary (such as the title, abstract, and list of authors), clicks on a figure, or views or downloads the full-text. Learn more
2,403
Citations
Additional affiliations
January 1994 - February 2016
University of Guadalajara
Position
  • Professor (Full)
January 1976 - February 2016
University of Guadalajara
Position
  • Professor (Full)
Description
  • I work on the synthesis and characterization of polymers Hydrogels for medical use Nanoparticles

Publications

Publications (166)
Article
Cellulose nanofibers are often available in aqueous suspensions (~90% water), and water removal becomes necessary to transportation, practical application, and characterization by specific instruments such as x-ray diffractometer or FTIR spectrometers. Since the water remotion interferes in some properties of nanocellulosic materials, the descripti...
Article
The formulation of anti-accretion additives for cleaning the hole in long-range directional or tangential wells in heavy and extra-heavy oil reservoirs is considered a technological challenge due to the unconsolidated characteristics of the formations (such as gravel, sand, pea, etc. ;) as well as the physicochemical properties of the heavy crude o...
Article
In this work, the effectiveness of a biodegradable modified pine rosin (Amberyl MP-30 (A-30)), is evaluated as compatibilizer or coupling agent to substitute resorcinol (which is toxic and non-biodegradable) in elastomeric formulations. Their mechanical properties are compared vs formulations containing resorcinol-hexamethylenetetramine (R-HMT) in:...
Article
Full-text available
This study investigates the addition of ground tire rubber (GTR) into virgin polyamide 6 (PA6) to produce thermoplastic elastomer (TPE) blends. In particular, a wide range of GTR concentration (0–100% wt.) was possible by using a simple dry blending technique of the materials in a powder form followed by compression molding. The molded samples were...
Article
When oil production by natural flow of reservoirs decreases, it is necessary to increase the production by using improved recovery processes, such as water injection. Injection of incompatible water can cause the formation of saline deposits of calcium and magnesium carbonates. The use of chemical inhibitors to treat incrustations involves the use...
Article
Introducción: Deficiencias asociadas a las formulaciones clásicas de los cementos óseos de poli (metacrilato de metilo) (PMMA) y a nuevas aplicaciones en Ortopedia, Traumatología y Neurocirugía han incentivado la investigación de nuevas formulaciones de cementos óseos con mejores propiedades. Métodos: Síntesis de hidroxiapatita micrométrica (Micro...
Article
Full-text available
The removal of Cu(II) ions from aqueous solutions at a pH of 5.0 was carried out using fixed-bed columns packed with alginate-chitosan (Alg-Ch) or alginate-chitosan sulfate (Alg-ChS) hydrogel beads. The effect of the initial Cu(II) concentration, flow rate, pH, and height of the column on the amount of Cu removed by the column at the breakpoint and...
Article
Full-text available
In this work, the suitability for the production of sustainable and lightweight materials with specific mechanical properties and potentially lower costs was studied. Agave fiber (AF), an agro-industrial waste, was used as a reinforcement and azodicarbonamide (ACA) as a chemical blowing agent (CBA) in the production of bilayer materials via rotatio...
Article
Full-text available
The aim of this research was to prepare chitosan composite films with commercial carboxymethylcellulose (CMC) and nanofibrillated cellulose (CNF) from palmito sheaths pulp (agroindustrial discard) and compare their influence over the film’s properties. The morphology of cellulose additives influenced their interaction with the polymer matrix as ver...
Article
The present work provided the valorization of agroindustrial residues from the palm peach (Bactris gasipaes) industry to produce cellulose nanofibrils (CNFs) and considered their application as a stabilizer agent for avocado oil emulsions. The treatments applied generated CNFs bundles with high aspect ratio, stability and mobility of (-) 19.82 ± 7....
Article
Full-text available
Ceramic materials mimic the mineral composition of native bone and feature osteoconductive properties; they are therefore used to regenerate bone tissue. Much research focuses on increasing the porosity and pore interconnectivity of ceramic scaffolds to increase osteoconductivity, cell migration and cell-cell interaction. We aimed to fabricate bioc...
Article
Full-text available
Ibuprofen-loaded poly(ethyl cyanoacrylate) nanoparticles were prepared by semicontinuous heterophase polymerization of ethyl cyanoacrylate in the presence of ibuprofen; different surfactant concentration, pH, and temperature were used. Particle size was measured by quasi-light scattering and transmission electron microscopy, while the amount of dru...
Article
In this study, agave fibers which are an important waste product of the Tequila industry are evaluated for the production of green biocomposites prepared with two biopolymers: polyhydroxybutyrate (PHB) and its copolymer with hydroxyvalerate P(HB-HV). The biocomposites were produced by compression molding with two main objectives: (1) to reduce the...
Article
Full-text available
Introduction: Drug carrying acrylic bone cements are currently used for the local treatment of deep muskuloskeletal infection. However, a clear definition has not been achieved about which are the best antibiotics to combine with the cements and what differences may be found between their release profiles. Objective: Study the long-term release (th...
Article
The kinetic and thermodynamics of adsorption of Red Dye 40 from acidic aqueous solutions onto a partially sulfated chitosan (ChS) was studied. The partially sulfated ChS was water insoluble in the pH range of 2-12. Experiments were carried out batchwise to determine the effect of pH, dye concentration, and temperature on the adsorption capacity of...
Conference Paper
Full-text available
Los cementos óseos acrílicos cargados de antibióticos poseen hoy día aplicaciones en diversas especialidades quirúrgicas como la Ortopedia, Neurocirugía y Traumatología. Son materiales que se pueden emplear tanto para la profilaxis o directamente en el tratamiento de procesos sépticos profundos del sistema músculoesqueletal. La alta incidencia en l...
Article
For the introductory chapter, an overview of the science and technology panorama of polymers is presented, focusing on the elements that have an influence on their properties. In that way, it starts by highlighting the importance of primary and secondary bonds on the structure and properties of polymers, and continues with some classifications of p...
Article
Full-text available
In this paper we describe the preparation of poly(ethyl cyanoacrylate) (PECA) nanoparticles (PECA-NP) by semicontinuous heterophase polymerization carried out at monomer starved conditions at three monomer addition rates. Scale size of the diameter of these nanoparticles was in the interval of 30-42 nm which was tuned monomer addition rate. The obt...
Conference Paper
Full-text available
A three-layer composite (polymer-fiber / polymer-foam / polymer-virgin) was made by rotational molding using a laboratory-scale biaxial rotational molding machine. The mold consists of a cylindrical stainless steel of five liters of volume. A linear medium density polyethylene (LMDPE) was used in all layers. In the composite layer a natural fiber (...
Article
Nanohydrogels were synthesized by microemulsion polymerization. These nanohydrogels were pre-designed to be pH and temperature stimuli-response materials, using N-isopropylacrilamide as a base monomer and 1-vinyl imidazole as ionizable comonomer. The pH sensitivity was confirmed by measuring the increase or decrease in volume in the nanoparticles b...
Article
Full-text available
A multilayer material was produced by rotational molding to study the effect of composition on the mechanical behavior of a cylindrical liquid container. The first (outer) layer was a composite of linear medium density polyethylene (LMDPE) with 5, 10, or 15 wt% agave fiber (AF). The core (middle) layer was foamed LMDPE with different amount of foam...
Book
Full-text available
PRÓLOGO La Universidad enfrenta un reto singular. En la actualidad su papel como proveedor de contenido ya no puede considerarse suficiente, simplemente porque el internet ofrece muchas fuentes en constante actualización, situación que lamentablemente no garantiza que la información ahí contenida sea veraz ni de calidad. En ese sentido, las institu...
Article
Full-text available
Water absorption and thermomechanical behavior of composites based on thermoplastic starch (TPS) are presented in this work, wherein the concentration of agave bagasse fibers (ABF, 0–15 wt%) and poly(lactic acid) (PLA, 0–30 wt%) is varied. Glycerol (G) is used as starch (S) plasticizer to form TPS. Starch stands as the polymer matrix (70/30 wt/wt,...
Article
A generalized model is presented here for the semicontinuous heterophase polymerization of methyl and hexyl methacrylate, which have very different water solubility. In this polymerization technique, neat monomer is fed at a controlled rate over a monomer-free aqueous solution of surfactant and initiator, to produce nanometer size particles with co...
Article
Full-text available
Water swelling kinetics, equilibrium water content, urea release kinetics, and freezable and non–freezable water of hydrogels based on acrylamide (AM), methyl methacrylate (MMA) and N,N'–methylene–bis– acrylamide (NMBA) were studied. A series of copolymeric gels of AM, MMA and NMBA as a crosslinker agent were prepared by free radical solution copol...
Article
Copolymeric nanoparticles of poly(N–isopropylacrylamide–co–acrylic acid) have been synthesized by inverse microemulsion polymerization. The obtained nanoparticles have been characterized by FTIR and DSC, to detect her molecular structure and glass transition temperatures respectively, by transmission electron microscopy (TEM) and quasielastic light...
Article
Full-text available
Foamed linear medium density polyethylene parts were prepared by rotational molding in biaxial mode, using different amounts of chemical-blowing agent (azodicarbonamide). Morphological and mechanical properties are presented and discussed in terms of foam density, cell density, average cell diameter, and open cell content. Internal air temperature...
Article
Full-text available
The semicontinuous heterophase polymerization of styrene in the presence of cross-linking and porogen agents was carried out. Latexes with close to 20% solid content, which contained mesoporous nanoparticles with 28 nm in average diameters, up to 0.5 cm3/g in porosity and 6-8 nm in pore diameters were obtained. By varying the monomer dosing rate ov...
Article
Full-text available
Vinyl acetate (VAc) was polymerized in microemulsion using sodium bis(2-ethylhexyl) sulfosuccinate (AOT) as surfactant and n-butanol (n-BuOH) as the cosurfactant (1:1, wt/wt) with potassium persulfate (KPS) as initiator. The effects of monomer, surfactant, and initiator concentration, as well as the temperature on the kinetics, particle size, and m...
Article
A previously presented model with four states (conversion, active and inactive particles and micelles) is further tested with conversion versus time experimental data at 50, 60, and 70°C, to recognize the main events occurring in styrene microemulsion polymerization. The S-shaped conversion–with no overprediction- and the bell-shaped active particl...
Article
A methodology is presented to obtain a kinetic model for curing reactions, from conversion against time and the glass-transition temperature versus conversion data. Isothermal runs for a cyanate ester resin from 140 to 190°C, reported previously, were evaluated. The approach utilizes the conversion measurement time derivatives that allow following...
Article
In this work, four polymerization mechanisms with flow are proposed where sustained oscillation can be present: (1) Polyaddition initiated by radicals produced by initiator decomposition, which is catalyzed by the polymer, first-order termination, a polymer disappears by a reaction with a third substance and by leaving the system in the exit flow....
Article
Full-text available
Smart nano–copolymeric matrices have been employed to load and release anti tuberculosis (anti – TB) drugs combinated complexes of Ethambutol (EMB), Isoniazid (INH), Rifampicin (RMP) and Pyrazinamide (PZA). Copolymeric nanocarriers were synthesized using a microemulsion polymerization method previously reported. These nanocarriers can show select...
Article
Full-text available
Nanoparticles of semiconducting polypyrrole (PPy) were synthesized by batch heterophase (BHP) and semicontinuous heterophase polymerization (SHP) using ferric chloride (FeCl3), potassium persulfate (KPS), or ammonium persulfate (APS) as the oxidizing agent, sodium dodecyl sulfate (SDS) as surfactant, and ethanol (EtOH) or iso-pentyl alcohol (iC5OH)...
Article
The semi-continuous heterophase polymerization (SHP) under monomer-starved conditions of methyl methacrylate and hexyl methacrylate is reported, at various monomer addition rates to elucidate the effect of monomer solubility on the mechanism of particle nucleation and growth. Polymer particles in the nanometer range from both monomers were obtained...
Conference Paper
Full-text available
Compared with the standard regression method alone, the proposed approach incorporates additional information contained in the derivative of the smoothed conversion measurement that does not require measuring the average number of radicals per particle. Moreover, an uncoupling technique is applied to facilitate parameter estimation. On the basis of...
Article
Vinyl acetate (VAc) was polymerized by a seeded semicontinuous heterogeneous process. Stable latexes with a polymer/surfactant weight ratio of 65 were obtained, which is comparable with the highest value reported in the literature for emulsion polymerization but with the advantage of obtaining smaller particles (average diameter, Dp ¼ 53 nm) which...
Article
A simple four-state model containing five-parameters, in conjunction with experimental conversion, particle number density and average molar masses, is presented to reproduce the semicontinuous heterophase polymerization of butyl methacrylate. The model adequately describes the experimental evolutions of conversion, particle size, average number of...
Conference Paper
Full-text available
A methodology is presented to obtain a kinetic model for curing reactions from conversion against time and the glass transition temperature versus conversion data. Isothermal runs for a cyanate ester resin from 140 to 190°C, reported previously, were evaluated. The approach utilizes the conversion measurement time-derivatives which allow following...
Article
The synthesis of poly(hexyl methacrylate) nanoparticles in nanoemulsions containing squalane as hydrophobe is reported here. A comparison of the polymerization kinetics of nanoemulsions prepared by Phase Inversion Temperature (low energy method) and microfluidization (high energy method), as well as polymer characteristics are presented. Nanoemulsi...
Article
The effect of itaconic acid (IA) as functionalizing agent on the static mechanical properties (Young's modulus, tensile stress, ultimate properties, and hardness) of core/shell polymers made of styrene and butyl acrylate by a two‐stage microemulsion polymerization process is reported. High‐polymer content (>35 wt%) was obtained in the first stage (...
Article
Two new kinetic mechanisms of polymerization are proposed (0Re–1,2 and 0Re–1) to study the instability of the steady states by the Lyapounov method. Both mechanisms take into account a reinitiation step in the polymerization process, but they are different because 0Re–1,2 considers two kinds of termination steps: a zero- and a second-order terminat...
Article
Full-text available
The high-yield synthesis of zinc oxide (ZnO) primary nanoparticles with high purity and with diameters between 6 and 22 nm using bicontinuous microemulsions is reported in this work. The ZnO nanoparticles were made by hydrolysis of Zn(NO 3) 2 with NaOH aqueous solution and precipitation, followed by calcination of the precipitate. Higher yields and...
Article
Full-text available
Precipitation of silver nanoparticles at 70°C was carried out by dosing a 1.3 M sodium borohydride aqueous solution over bicontinuous microemulsions formed with a mixture of sodium bis(2-ethylhexyl) sulfosuccinate (AOT) and sodium dodecylsulfate (SDS) as surfactants, a 0.5 M silver nitrate aqueous solution, and toluene. Weight ratios of 2.5/1 and 3...
Article
Full-text available
The effect of monomer feeding rate on particle size, molar masses, glass transition and tacticity of poly(n-butyl methacrylate) (PBMA) nanoparticles synthesized by semi-continuous heterophase polymerization under monomer-starved conditions is reported. Three feed rates were examined. Highly monomer-starved conditions at the two slower addition rate...
Chapter
Full-text available
Microemulsion and semicontinuous heterophase polymerizations are processes that allow the synthesis of nanosized polymer particles (10–100 nm) with narrow size distributions in a simple and routinely fashion. Methods to overcome the main drawback of microemulsion polymerization, mainly low polymer/surfactant weight ratio, are reviewed. Relevant lit...
Article
Nanoemulsions of water, Brij 56 and hexyl methacrylate (with a small amount of squalene as hydrophobe or costabilizer) were made by the phase inversion temperature (PIT) method and then polymerized. In the absence of squalene, the nanoemulsions destabilized within minutes; however with squalene, the nanoemulsions were kinetically stable for at leas...
Article
Vinyl acetate (VAc) and butyl acrylate (BuA) were copolymerized in heterophase by a semicontinuous process (unseeded) and compared with the seeded semicontinuous microemulsion polymerization of the same monomers. A mixture of sodium dodecyl sulfate (SDS) and poly(ethylene oxide) dodecyl ether (Brij-35®) were used as surfactants. The effects of mono...
Article
Full-text available
A series of star–shaped poly(acrylamide–co–[2–(acryloyloxy)ethyl] trimethyl ammonium chloride) were prepared by inverse microemulsion polymerization. The growth of side chains in the arms of the precursor has been carried out using different compositions of the comonomers acrylamide and [2–(acryloyloxy)ethyl] trimethyl ammonium chloride) (Q9). The...
Article
Full-text available
A simple model for cure kinetics, based on the Churchill-Usagi correlation, is presented here. This proposal, intended for engineering purposes, is capable of reducing computational time to facilitate, even with analytic solutions, the kinetics description, especially when more complex systems are being studied. In spite of the model’s simplicity,...
Article
Full-text available
En la actualidad uno de los principales problemas de contaminación de las aguas es la causada por las industrias que utilizan colorantes sintéticos debido a que descargan grandes volúmenes de aguas residuales. El tratamiento de estas aguas residuales son desde hace muchos años tema de estudio debido a la problemática ecológica, ya que los colorante...
Article
Full-text available
A simple model for cure kinetics, based on the Churchill-Usagi correlation, is presented here. This proposal, intended for engineering purposes, is capable of reducing computational time to facilitate, even with analytic solutions, the kinetics description, especially when more complex systems are being studied. In spite of the model's simplicity,...
Article
In this study, agave fiber/linear medium density polyethylene composites were manufactured by rotational molding. A laboratory scale biaxial machine was used, where the internal air temperature during the processing cycle was measured. Two sizes of agave fibers (50 and 100 mesh) were used separately and mixed together (50/50) at concentrations vary...
Conference Paper
Full-text available
The semicontinuous heterogeneous polymerization (SHP) is examined with a four-state (conversion, total particle number,average radical number per particle and reactor volume) and a five-parameter (rates of entrance of radicals to micelles and to particles, exit of radicals from particles, homogeneous nucleation and coagulation) model, along with ex...
Article
The synthesis of styrene-acrylonitrile copolymers by semicontinuous heterophase polymerization is reported here. The effect of feed composition at a fixed addition rate of monomer mixture on kinetics, particle size, polymer content, and molar masses, was studied. This process permits the synthesis of nanolatexes containing narrow size-distribution...