Mirna Mosiewicki

Mirna Mosiewicki
Universidad Nacional de Mar del Plata | UNMDP · Materials Engineering, Chemical Engineering

PhD

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68
Publications
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Publications

Publications (68)
Article
Bilayer films that combine chitosan and alginate, two natural polysaccharides, and magnetic iron oxide nanoparticles (MNPs) were obtained. Physical and microscopic observations revealed that chitosan and alginate interact strongly through their surfaces, which is attributed to the formation of a polyelectrolyte complex at the interface. The diamete...
Article
This work shows the feasibility of producing waterborne polyurethane nanocomposites containing magnetic nanoparticles (MNP) by casting method, to obtain films with potential magnetic properties. The characterization of the resulting nanocomposites is carried out using infrared spectroscopy, thermal analysis, colorimetry, tensile tests, microscopy a...
Article
A highly functionalized bio‐based derivative of ricinoleic acid (MMRA) was synthesized through a two‐step procedure: maleinization of the hydroxyl group naturally present in this fatty acid followed by methacrylatation of the carboxylic acid groups. The chemical structure of MMRA was confirmed by proton nuclear magnetic resonance (¹H NMR), infrared...
Article
Films made from neat chitosan and chitosan with magnetic nanoparticles (MNPs) were tested as adsorbents of arsenate ions. Sorption equilibrium and sorption kinetics studies are reported, including different models applied to enlighten experimental observations and predict results. The sorption of As (V) was reasonably explained using Freundlich iso...
Article
The impending world oil shortage, global climate changes and environmental pollution encourages the use of natural renewable resources to produce substitutes for petroleum‐ derived polymers. In this work, two series of bio‐based thermoset polymers were prepared by free radical polymerization of commercially available acrylated epoxidized soybean oi...
Article
In this work, bio-based “malleable” crosslinked polymers that present suitable stress relaxation at relatively high temperatures and thermal welding (without the addition of any extrinsic catalyst) were evaluated. Two series of polymers were prepared: one coming from the polymerization of methacrylated oleic and lauric acids with styrene and the ot...
Article
Superparamagnetic iron oxide nanoparticles (MNP) were synthesized and incorporated into alginate film forming solutions, leading to composite magnetic films. Both plasticized and non-plasticized films were obtained after casting and drying. It was found that part of the MNP are forming agglomerates or clusters of different sizes into the biopolymer...
Article
The present work is focused on the study of the formulation effect of cationically polymerized vegetable oil thermoset on their aging behavior. Toward this aim, tung oil-based biopolymers were prepared using different comonomers or adding a modifier. Specifically, synthetic and natural comonomers (styrene, divinylbenzene and a methyl ester of tung...
Article
Thermoset polyurethanes (PUs) were prepared from a polyol derived from castor oil, 4,4′‐methylene diphenyl diisocyanate (MDI) and different trifunctional low‐molecular‐weight crosslinkers, biobased glycerol (Gly) and petroleum‐derived trimethylolpropane (TMP). The synthesis was carried out in bulk and without catalyst via one‐step polymerization va...
Article
Composite films based on chitosan, glycerol and magnetic iron oxides were obtained by two different procedures: in situ generation of iron oxide particles in the already formed films and dispersion of previously synthesized iron oxide particles into the film forming solution by sonication, and then tested as adsorbents for the removal of congo red...
Article
In this study, bio-based materials were prepared from fatty acid precursors and variable amounts of styrene or divinylbenzene by free-radical polymerization. The obtained materials were highly translucent and resulted insoluble in common organic and aqueous solvents. They exhibit a complex microstructure due to the formation of highly cross-linked...
Article
Fatty acid based monomers have been synthesized by a one step reaction from oleic orlauric acids andglycidyl methacrylateto be later used in polymer formulations. Different times of reaction, amount of catalyst and initial ratio of reactives were evaluated, obtaining conversions higher than 0.9 for the best conditions. The obtained monomers are int...
Article
The activation of unconstrained shape recovery in bio‐based polymeric nanocomposites is successfully achieved using magnetic nanoparticle heating. The materials investigated in this work present several distinct physical and chemical characteristics worth pointing out: they can be deformed and the original shape can be recovered by remotely heating...
Article
This work investigates the structure and magnetic properties of chitosan based films with different contents of magnetic nanoparticles (MNPs) of around 10 nm as well as the effects of the addition of glycerol as plasticizer. Synthesized MNPs were dispersed in the chitosan film forming solution by ultrasonication and then composite films were obtain...
Article
Shape memory composites based on a commercial segmented polyurethane and magnetite (Fe3O4) nanoparticles (MNPs) were prepared by a simple suspension casting method. The average sizes of individual magnetic particles/clusters were determined by TEM microscopy and corroborated from SAXS patterns. The magnetization properties of selected samples were...
Article
Shape-memory composites based on a commercial segmented polyurethane and magnetite (Fe3O4) nanoparticles (NPs) were prepared by a simple suspension casting method. The properties of the resulting nanocomposites, containing 1 to 10 nominal wt.% magnetic particles, were evaluated by thermogravimetric tests, contact angle measurements, differential sc...
Article
In this work, sodium alginate was used as the polymeric matrix of magnetic nanocomposite films where iron oxide particles, in percentages varying from 2 to 10 wt.% (respect to alginate content), were synthesized “in situ”. The effects of the nanoparticle concentration and the addition of 30 wt.% of glycerol as plasticizer on the properties of the c...
Article
Elastomeric polyurethanes were prepared from a reference polyurethane system modified with biobased polyols synthesized using rapeseed or palm oils. The reference material was modified by replacement of the commercial polyol by 10% of biopolyols and also by addition of sisal fibers up to 5 wt%. The higher functionality of the biopolyols increased t...
Article
A study on the effect of the composition and chemical aging in tung oil-styrene networks prepared by cationic polymerization is presented. To this aim, the experimental techniques positron annihilation lifetime spectroscopy and dynamic-mechanical analysis were used. The representative experimental parameters were the nanohole free volume, the glass...
Article
The production of flexible polyurethane foams (FPF) with good acoustical performance to control sound and noise and incorporating bio/recycled raw materials is an interesting alternative to conventional acoustic absorbent materials. In this sense, biobased polyols like glycerol (GLY) or hydroxylated methyl esters derived from tung oil (HMETO) as mu...
Article
Solid biobased polyurethanes (PUs) were prepared from a rapeseed oil-based polyol (ROPO) synthesized by epoxidation reaction followed by oxirane ring-opening with diethylene glycol. The reference material was modifed by replacement of the ROPO with glycerol in different proportions and also by addition of commercial microcellulose (MC). The curing...
Article
Full-text available
The aim of this work is to study the influence of the polymeric matrix composition on particle aggregation, magnetic interparticle interactions and nanoparticle surface effects, which affect the magnetic and structural properties of different ultra-diluted magnetite nanocomposites (MNCPs). Bio-based matrices were selected as a possible response to...
Article
A series of flexible polyurethane foams with different polyol compositions were synthesized through the replacement of a portion of the petroleum-based polyether polyol with biobased polyols, namely, glycerol (GLY) and hydroxylated methyl esters (HMETO). HMETO was synthesized by the alkaline transesterification of tung oil (TO; obtaining GLY as a b...
Chapter
Polyurethanes (PUs) are versatile polymers that have found ample variety of applications in quite different fields, including foams (flexible cushions as well as rigid heat insulators), construction, adhesives, gaskets and coatings, as well as medical devices.The facility of handling the formulation is the main reason for complying with such a wide...
Article
Magnetic nanocomposites using chitosan as a matrix and magnetite nanoparticles (MNP) generated “in situ” were prepared and magnetically characterized. The content of nanoparticles on the composites was varied from 2 to 10 wt.% and their effects, as well as the addition of 30 wt.% of glycerol as plasticizer in the formulation, were analyzed. The mag...
Article
The increasing interest of academic and industrial sectors in the use of bio-based materials mirrors the overwhelming need for replacing, as much as possible, petroleum derived chemicals, reducing the negative environmental impact derived from their usage. Vegetable oils fulfill extremely well this goal, because of their worldwide availability, lar...
Article
Rigid polyurethane foams were synthesized by using a vegetable oil-based polyol and 4,4-diphenylmethane diisocyanate prepolymer as the majority of reactives,. The polyol was produced by hydroxylation of crude linseed oil with performic acid generated in situ by the reaction of hydrogen peroxide and formic acid. The characterization by FTIR, H1NMR,...
Chapter
The use of nano-reinforcements has become a novel approach to enhance the properties of polyurethanes. Nanocellulose has proven to be an excellent choice as reinforcement at considerably low concentrations (~0.5 wt%) due to its much higher surface area and reduced number of defects at the nano level. Its incorporation offers a way to achieve the sa...
Article
A rapeseed oil-based polyol (ROPO) was synthesized using chemical modification of the rapeseed oil (RO) by epoxidation reaction followed by oxirane ring-opening with diethylene glycol. The ROPO was used in the formulation of low-density green polyurethane (PU) foams. The use of glycerol as hydroxyl component, water as a reactive blowing agent and m...
Article
The direct reaction of unmodified tung oil and styrene initiated by boron trifluoride diethyl etherate allowed obtaining thermoset polymers with valuable properties like shape memory behavior. On the other hand, the addition of magnetite nanoparticles (MNPs) to the tung oil/styrene copolymer was considered, in order to improve/modify its properties...
Chapter
The three most abundant renewable polysaccharides in nature share rather similar building blocks, but they exhibit quite different properties because the existing differences in molecular structure lead to different arrangements and supramolecular structures. In particular, surface modification is performed to improve interfacial compatibility and...
Article
The last two decades have witnessed an exponential growth in the interest for using bio-derived products, which has been driven by the need for replacing petroleum based materials reducing the fuel consumption and, equally important, for producing materials with lower environmental impact. Vegetable oils constitute a rich source for many different...
Article
Viscoelastic polyurethane (PU) foams based on modified tung oil, ethylene glycol and polymeric MDI, and reinforced with rice husk ash (RHA), were prepared by a free-rise pouring method and characterized in terms of density, compression and dynamic mechanical behavior. The density of foams ranged between 50 and 90 kg/m3, depending on the position of...
Article
New thermoset polymers prepared by cationic co-polymerization of tung oil with styrene and/or divinylbenzene were evaluated at different times after their preparation. The changes in the properties were correlated with the composition of the copolymers. The action of atmospheric oxygen on the fatty acid unsaturations produced chemical changes in th...
Article
A chemically modified tung oil was used as the main polyol component in the formulation of viscoelastic (low resilience) polyurethane foams. Rice Husk Ash (RHA), a residue from the rice process industry, was chosen to be incorporated as rigid filler in these materials because of its high silica content. Water was used as blowing agent in order to i...
Article
The mechanical and damping properties as well as the shape memory behavior of copolymers obtained by cationic copolymerization of tung oil with styrene with different stoichiometric ratios are presented and analyzed in this work. The glass transition temperatures are close to room temperature for all the copolymers, and generally increase with the...
Article
In nanocomposites containing single wall carbon nanotubes (SWCNTs), the final properties strongly depend on the dispersion quality of these fillers. Various methods have been used to improve the dispersion of nanofillers; however, one of the most effective ways is to functionalize carbon nanotubes (CNTs) with covalent and noncovalent functional gro...
Article
The biodegradation of a new tung oil based polyurethane and a derived wood flour (WF) composite was followed during 383 days of exposure to soil or vermiculite media. The hydrolytic degradation was the most important mechanism of deterioration in all cases. A shift of the glass transition towards higher temperatures was observed, which was explaine...
Article
Natural composites prepared from a polyurethane (PU) based on tung oil and different percentages of wood flour (WF) or microcellulose (MC) were exposed to humid environments and the resulting changes of their properties were evaluated. The equilibrium moisture content of the composites increased with the wood flour percentage. Dynamic mechanical te...
Article
The response of synthesized shape memory segmented polyurethanes (PUs) was affected by the addition of cellulose nanocrystals, as well as by the various conditions selected to carry out thermomechanical cyclic tests. The PUs were synthesized from an α-hydro-ω-hydroxy-poly(ethylene oxide), tolylene-2,4-diisocyanate and 1,4-butanediol as chain extend...
Article
The creep behavior of new polymers prepared by free radical polymerization of styrene-crosslinked resins obtained from linseed oil and derived wood flour (WF) composites have been analyzed. Results of short-time flexural creep tests at different temperatures are reported. The effects of the wood flour content and temperature are discussed. The cree...
Article
Partially foamed and nanocellulose-reinforced polyurethanes (PU) based on castor oil (CO) were prepared and their different properties were measured and related to their structures. A castor oil-based polyol (COPO) was obtained by alcoholysis of CO with triethanolamine. The COPO was used in the preparation of partially foamed and solid PU. Cellulos...
Article
Segmented polyurethanes exhibiting shape memory properties were modified by the addition of polyaniline (PANI)‐coated cellulose nanofibrils (CNFs). The two‐phase structure of the polymer is responsible for the material's ability to ‘remember’ and autonomously recover its original shape after being deformed in response to an external thermal stimulu...
Article
Multi-walled carbon nanotubes (CNTs) and cellulose nanofibers (CNFs) reinforced shape memory polyurethane (PU) composite fibers and films have been fabricated via extrusion and casting methods. Cellulose nanofibers were obtained through acid hydrolysis of microcrystalline cellulose. This treatment aided in achieving stable suspensions of cellulose...
Article
The use of Fourier transform infrared (FTIR) and raman spectroscopies in the characterization of modified natural fibers and polymer interfaces in composite materials is reviewed. The changes in composition of the fibers owing to leakage of original components and/or incorporation of various species attached or adsorbed on the fiber surfaces, chang...
Article
Copolymers based on tung oil (TO) and presenting a very wide range of properties were obtained. Depending on the chemical composition, materials fitted for structural or functional applications were prepared. The use of divinylbenzene (DVB) as a comonomer in the cationic polymerization of the triglyceride allowed us to obtain polymers with a high t...
Article
Liquid polymer precursors were synthesized from vegetable oils to be utilized in the preparation of oil based-resins to be later reinforced with a filler also obtained from natural sources. In this work, an unsaturated oil, tung oil, produced in the region was selected as raw material. The vegetable oil was chemically functionalized to obtain a pol...
Article
Full-text available
The effect of the addition of microcrystalline cellulose nanofibers into linear segmented polyurethanes (SPU) was investigated. The polymers were synthesized with 4,4-methylene-bisphenyldiisocyanate (MDI) and poly(tetramethyleneglycol) (PTMG) with 1,4-butanediol (BD) as chain extender. The nanocrystals were introduced during the PU polymerization,...
Article
Single-wall carbon nanotubes (SWCNT), multiwall carbon nanotubes (MWCNT), and carbon nanofibers (CNF) were oxidized with a conventional H(2)SO(4)/HNO(3) treatment, and the resulting COOH groups were esterified with phenyl glycidyl ether (PGE). Pristine, oxidized and esterified SWCNT, MWCNT, and CNIF (1 wt%) were dispersed in diglycidyl ether of bis...
Article
The growing environmental concerns together with the reduction of petroleum resources have been a motor for revitalizing the interest in using raw materials from renewable resources. Among those, vegetable oils constitute a valuable renewable source. Their chemical modification is a promising alternative to substitute (at least partially) petrochem...
Article
Full-text available
A natural polyol was prepared from castor oil by alcoholysis with triethanolamine. The oil and the oil-based polyol were characterized by infrared spectroscopy and through the analytical determination of their functional groups, both techniques indicating that the hydroxyl content increased significantly after the alcoholysis reaction. The modified...
Article
In nanocomposites containing single-wall or multi-wall carbon nanotubes (SWCNT and MWCNT) high damping can be achieved by taking advantage of the weak bonding and interfacial friction between individual nanotubes and the matrix. The increase in damping capacity has already been proved for stiff epoxies and in this study it is extended to epoxy elas...
Article
A natural polyol was obtained from tung oil (TO) to be further used in the formulation of rigid polyurethane polymers. The synthesis of the polyol was carried out in two steps: first hydroxylation of the double bonds in the fatty acid chains of the unsaturated oil and then, alcoholysis of the hydroxylated oil with triethanolamine. The chemical anal...
Article
New composite materials with a high percentage of their composition based on renewable resources, matrix and reinforcement, were prepared. The excellent compatibility of the main phases lead to an unusual outstanding composite behavior as follows: higher modulus and strength, but also higher deformability and fracture resistance than the neat polym...
Article
Natural rubber latex was added to composite materials formulated from a quebracho tannin adhesive crosslinked with hexamethylenetetramine and wood flour as a reinforcing filler. The final microstructure of the thermoset modified by the addition of different concentrations of latex was observed by scanning electron microscopy. The flexural and impac...
Article
The changes in the properties of new crosslinked polymers based on renewable resources and their derived composites have been monitored as a function of time; this knowledge being necessary to estimate their behavior in final applications. Rigid thermoset polymers prepared by free radical polymerization of resins obtained from linseed oil and styre...
Article
The thermal and mechanical behavior of new natural polymeric composite materials after exposure to humid environments must be well known and understood in order to predict their performance in final applications. For this reason, composites made from unsaturated polyesters based on linseed oil and filled with wood flour were exposed to environments...
Article
The aim of this work has been to develop new composites using filler and resins obtained from renewable resources, combining low cost and good mechanical properties. The raw materials selected for the polymeric matrix were tannin extracts and plant oils. The tannin extracts are potential substitutes for phenol-formaldehyde wood-bonding adhesives an...
Article
Full-text available
Styrene/vinylester (St/VE) and Styrene/unsaturated polyester (St/UP) cross-linked thermosets are widely used as matrices in composites formulations. Atomic force microscopy (AFM) is used to study the detail of the topography at a nanometric scale and determine the nanostructures of the surface of these systems. The cross-linked reaction in both sys...
Article
In this study, rigid thermoset polymers were prepared from radical copolymerization of linseed oil monoglyceride maleates with styrene (St). First, linseed oil monoglycerides (LOMGs) were obtained from the reaction of linseed oil with glycerol at 220–240°C. Then, LOMGs were reacted with maleic anhydride at 80°C to produce the LOMG maleate half este...
Article
The purpose of this project was to obtain new composites using filler and resin obtained from renewable resources, combining low cost and good mechanical properties. The matrix consisted of a polyester resin synthesized from linseed oil and further crosslinked with styrene in a peroxide-initiated reaction. Composite materials made from the unsatura...
Article
Composite materials formulated with a natural polyphenolic matrix (commercial tannin adhesive made from quebracho tannin extract), pine woodflour as reinforcing material, and hexamethylenetetramine as hardener were prepared and tested. Scanning electron microscopy of fractured samples was used to analyze the efficiency of the wetting and adhesion o...

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