Samper Madrigal, María Dolores
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- PublicationNew environmentally friendly composite laminates with epoxidized linseed oil (ELO) and slate fiber fabrics(Elsevier, 2015-03-15) Samper Madrigal, María Dolores; Petrucci, R.; Sánchez Nacher, Lourdes; Balart Gimeno, Rafael Antonio; Kenny, J. M.; Departamento de Ingeniería Mecánica y de Materiales; Instituto Universitario de Investigación de Tecnología de los Materiales de la UPV; Escuela Politécnica Superior de Alcoy; Generalitat ValencianaThis work focuses on the development of new composite laminates based on the use of epoxidized linseed oil (ELO) as matrix and reinforcement fabrics from slate fibers with different silane treatments. The curing behavior of the ELO resin is followed by differential scanning calorimetry (DSC) and the gelation is studied by oscillatory rheometry and gel-time. Composite laminates of ELO matrix and slate fabrics are manufactured by Rein Transfer Molding (RTM) and the mechanical properties of the composite laminates are tested in tensile, flexural and impact conditions. The effects of different silane coupling agents on fiber-matrix interface phenomena are studied by scanning electron microscopy (SEM). As in other siliceous fibers, silane treatment leads to improved mechanical performance but glycidyl silane treatment produces the optimum results as the interactions between silanized slate fiber and epoxidized linseed oil are remarkably improved as observed by scanning electron microscopy (SEM). (C) 2014 Elsevier Ltd. All rights reserved.
- PublicationImproved Toughness in Lignin/Natural Fiber Composites Plasticized with Epoxidized and Maleinized Linseed Oils(MDPI AG, 2020-02-01) Dominici, Franco; Samper Madrigal, María Dolores; Carbonell-Verdu, Alfredo; Luzi, Francesca; López Martínez, Juan; Torre, Luigi; Puglia, Debora; Departamento de Ingeniería Mecánica y de Materiales; Instituto Universitario de Investigación de Tecnología de los Materiales de la UPV; Escuela Politécnica Superior de Alcoy; AGENCIA ESTATAL DE INVESTIGACION[EN] The use of maleinized (MLO) and epoxidized (ELO) linseed oils as potential biobased plasticizers for lignin/natural fiber composites formulations with improved toughness was evaluated. Arboform®, a lignin/natural fiber commercial composite, was used as a reference matrix for the formulations. The plasticizer content varied in the range 0¿15 wt % and mechanical, thermal and morphological characterizations were used to assess the potential of these environmentally friendly modifiers. Results from impact tests show a general increase in the impact-absorbed energy for all the samples modified with bio-oils. The addition of 2.5 wt % of ELO to Arboform (5.4 kJ/m2) was able to double the quantity of absorbed energy (11.1 kJ/m2) and this value slightly decreased for samples containing 5 and 10 wt %. A similar result was obtained with the addition of MLO at 5 wt %, with an improvement of 118%. The results of tensile and flexural tests also show that ELO and MLO addition increased the tensile strength as the percentage of both oils increased, even if higher values were obtained with lower percentages of maleinized oil due to the possible presence of ester bonds formed between multiple maleic groups present in MLO and the hydroxyl groups of the matrix. Thermal characterization confirmed that the mobility of polymer chains was easier in the presence of ELO molecules. On the other hand, MLO presence delayed the crystallization event, predominantly acting as an anti-nucleating agent, interrupting the folding or packing process. Both chemically modified vegetable oils also efficiently improved the thermal stability of the neat matrix.
- PublicationIntroducción al programa Linseis TA Evaluation_v2(2021-06-23T09:39:09Z) Samper Madrigal, María Dolores; Ferri Azor, José Miguel; Departamento de Ingeniería Química y Nuclear; Departamento de Ingeniería Mecánica y de Materiales; Instituto Universitario de Investigación de Tecnología de los Materiales de la UPV; Escuela Politécnica Superior de AlcoyEn el presente screencast se realiza la introducción al software de evaluación "Linseis TA Evaluation" para analizar curvas termogravimétricas (TGA). Los objetivos que se desarrollan son la familiarización con la interfaz del software, descubrimiento del funcionamiento básico del software y la utilización de diferentes herramienta que resultan muy útiles para la evaluación de curvas TGA.
- PublicationEffect of Epoxidized and Maleinized Corn Oil on Properties of Polylactic Acid (PLA) and Polyhydroxybutyrate (PHB) Blend(MDPI AG, 2022-10) Sempere Torregrosa, Jaume; Ferri Azor, José Miguel; de la Rosa Ramírez, Harrison; Pavón Vargas, Cristina Paola; Samper Madrigal, María Dolores; Departamento de Ingeniería Química y Nuclear; Departamento de Ingeniería Mecánica y de Materiales; Instituto Universitario de Investigación de Tecnología de los Materiales de la UPV; Escuela Politécnica Superior de Alcoy; AGENCIA ESTATAL DE INVESTIGACION[EN] The present work analyzes the influence of modified, epoxidized and maleinized corn oil as a plasticizing and/or compatibilizing agent in the PLA¿PHB blend (75% PLA and 25% PHB wt.%). The chemical modification processes of corn oil were successfully carried out and different quantities were used, between 0 and 10% wt.%. The different blends obtained were characterized by thermal, mechanical, morphological, and disintegration tests under composting conditions. It was observed that to achieve the same plasticizing effect, less maleinized corn oil (MCO) is needed than epoxidized corn oil (ECO). Both oils improve the ductile properties of the PLA¿PHB blend, such as elongation at break and impact absorb energy, however, the strength properties decrease. The ones that show the highest ductility values are those that contain 10% ECO and 5% MCO, improving the elongation of the break of the PLA¿PHB blend by more than 400% and by more than 800% for the sample PLA.
- PublicationInterference of biodegradable plastics in the polypropylene recycling process(MDPI AG, 2018) Samper Madrigal, María Dolores; Bertomeu, D.; Arrieta, M. P.; Ferri Azor, José Miguel; López Martínez, Juan; Departamento de Ingeniería Química y Nuclear; Departamento de Ingeniería Mecánica y de Materiales; Instituto Universitario de Investigación de Tecnología de los Materiales de la UPV; Escuela Politécnica Superior de Alcoy; Generalitat Valenciana[EN] Recycling polymers is common due to the need to reduce the environmental impact of these materials. Polypropylene (PP) is one of the polymers called commodities polymers' and it is commonly used in a wide variety of short-term applications such as food packaging and agricultural products. That is why a large amount of PP residues that can be recycled are generated every year. However, the current increasing introduction of biodegradable polymers in the food packaging industry can negatively affect the properties of recycled PP if those kinds of plastics are disposed with traditional plastics. For this reason, the influence that generates small amounts of biodegradable polymers such as polylactic acid (PLA), polyhydroxybutyrate (PHB) and thermoplastic starch (TPS) in the recycled PP were analyzed in this work. Thus, recycled PP was blended with biodegradables polymers by melt extrusion followed by injection moulding process to simulate the industrial conditions. Then, the obtained materials were evaluated by studding the changes on the thermal and mechanical performance. The results revealed that the vicat softening temperature is negatively affected by the presence of biodegradable polymers in recycled PP. Meanwhile, the melt flow index was negatively affected for PLA and PHB added blends. The mechanical properties were affected when more than 5 wt.% of biodegradable polymers were present. Moreover, structural changes were detected when biodegradable polymers were added to the recycled PP by means of FTIR, because of the characteristic bands of the carbonyl group (between the band 1700-1800 cm(-1)) appeared due to the presence of PLA, PHB or TPS. Thus, low amounts (lower than 5 wt.%) of biodegradable polymers can be introduced in the recycled PP process without affecting the overall performance of the final material intended for several applications, such as food packaging, agricultural films for farming and crop protection.
- PublicationImplementación del método de aprendizaje activo y colaborativo en las prácticas de laboratorio de Materiales Ecoeficientes en modalidad virtual(Editorial Universitat Politècnica de València, 2021-09-28) Pavón Vargas, Cristina Paola; Aldas, Miguel; Samper Madrigal, María Dolores; López Martínez, Juan; Departamento de Ingeniería Mecánica y de Materiales; Instituto Universitario de Investigación de Tecnología de los Materiales de la UPV; Escuela Politécnica Superior de Alcoy[EN] During the 2020/21 academic year, the active and collaborative learning methodology was implemented in the development of a laboratory practice of the Eco-efficient Materials course of the second year of the University Master's Degree in Engineering, Processing and Characterization of Materials, in virtual modality. The use of this methodology aims to promote student participation and increase their level of responsibility in the laboratory practice, making use of the advantages of a virtual modality. Before carrying out the practice, students were given a script and then an explanatory session and resolution of doubts was held. The practices were carried out in a virtual and synchronous way. The students were responsible for setting the parameters and the teacher was in charge of reproducing them in the laboratory. The objective of this work was to observe the behavior of the students in decision-making, to appreciate if they acquired the necessary knowledge for the development of the practice and to solve the problems that may arise during it. Subsequently, the learning methodology between a virtual and a face-to-face modality was compared, and an active and collaborative learning methodology was developed that can be applied in either of the two scenarios.
- PublicationDeterminación del porcentaje de agente de acoplamiento en composites de bioPE con carga lignocelulósica(Compobell, S.L., 2015-07-14) Montañés Muñoz, Néstor; Boronat Vitoria, Teodomiro; Fenollar Gimeno, Octavio Ángel; García Sanoguera, David; Samper Madrigal, María Dolores; Departamento de Ingeniería Mecánica y de Materiales; Instituto Universitario de Investigación de Tecnología de los Materiales de la UPV; Escuela Politécnica Superior de Alcoy; Generalitat ValencianaEn el presente trabajo se ha investigado acerca de cuál es la proporción óptima de agente de acoplamiento que se debe añadir en el desarrollo y formulación de un nuevo material compuesto, comercialmente viable, basado 100% en recursos naturales, esto es en un green composite . La matriz de este nuevo material compuesto es un biopolietileno obtenido de la caña de azúcar y como carga de refuerzo lignocelulósica se ha utilizado Thymus Moroderi (TM), un residuo que se produce como resultado de la destilación de un licor fabricado por una empresa local. Con el fin de mejorar la adhesión entre la matriz y la carga, en una primera fase del estudio se evaluaron cuatro posibles agentes de acoplamiento con el objetivo de determinar cuál era el más conveniente. Del análisis de los resultados obtenidos tras la realización de una caracterización térmica y mecánica completa de los compuestos elaborados, se concluyó que el blend tratado con el agente Poly(Ethylene-co-glycidil Methacrylate) (PEGM) era el que presentaba mejores características, ya que se aumentaba notoriamente la interface entre la matriz y la carga. Siendo que todos los agentes de acoplamiento se habían añadido en la proporción de un 10% de la carga, en esta segunda fase como se ha mencionado el objetivo ha sido establecer cuál es la proporción óptima en la que se debe añadir dicho agente de acoplamiento.
- PublicationInfluence of Ultraviolet Radiation Exposure Time on Styrene-Ethylene-Butadiene-Styrene (SEBS) Copolymer(MDPI AG, 2020-04) García García, Daniel; Crespo Amorós, José Enrique; Parres García, Francisco José; Samper Madrigal, María Dolores; Departamento de Ingeniería Mecánica y de Materiales; Instituto Universitario de Investigación de Tecnología de los Materiales de la UPV; Escuela Politécnica Superior de Alcoy; Generalitat Valenciana; Agencia Estatal de Investigación[EN] The effect of ultraviolet radiation on styrene-ethylene-butadiene-styrene (SEBS) has been studied at different exposures times in order to obtain a better understanding of the mechanism of ageing. The polymer materials were mechanically tested and then their surfaces were analyzed using a scanning electron microscope (SEM) and atomic force microscopy (AFM). Moreover, the optical analysis of contact angle (OCA) was used to evaluate the surface energy (gamma(s)) and the yellowing index (YI) and attenuated total reflectance infrared spectroscopy (ATR-FTIR) were used to observe structural and physical changes in aging SEBS. The results obtained for the SEBS, in relation to the duration of exposure, showed superficial changes that cause a decrease in the surface energy (gamma(s)) and, therefore, a decrease in surface roughness. This led to a reduction in mechanical performance, decreasing the tensile strength by about 50% for exposure times of around 200 hours.
- PublicationProceso de preparación de blends termoplásticos con nanopartículas conductoras(Universitat Politècnica de València, 2013-05-27) Samper Madrigal, María Dolores; López Martínez, Juan; Departamento de Ingeniería Mecánica y de Materiales; Instituto Universitario de Investigación de Tecnología de los Materiales de la UPV; Escuela Politécnica Superior de Alcoy
- PublicationProperties of composite laminates based on basalt fibers with epoxidized vegetable oils(Elsevier, 2015-05-05) Samper Madrigal, María Dolores; Petrucci, R.; Sánchez Nacher, Lourdes; Balart Gimeno, Rafael Antonio; Kenny, J. M.; Departamento de Ingeniería Mecánica y de Materiales; Instituto Universitario de Investigación de Tecnología de los Materiales de la UPV; Escuela Politécnica Superior de Alcoy; Generalitat ValencianaThis paper deals with the development of polymeric materials derived from epoxidized vegetable oils which have been used in the manufacture of laminated composite materials with basalt fabrics. Epoxidized linseed oil (ELO) and epoxidized soybean oil (ESBO) were used as biobased matrices. The basalt fabrics were modified with amino-silane and glycidyl-silane to increase fiber-matrix interactions. The curing behaviour of both resins was evaluated by differential scanning calorimetry (DSC) and oscillatory rheometry (OR). The evaluation of mechanical properties was made by tensile, flexural and Charpy tests. The extent of the fiber-matrix interactions among interface was evaluated by scanning electron microscopy (SEM). The obtained results revealed that surface modification of basalt fibers with glycidyl-silane clearly improves the mechanical properties of the composites. The use of the ELO resin as matrix for composite laminates improved substantially the mechanical performance compared to composites made with ESBO. (C) 2015 Elsevier Ltd. All rights reserved.