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Galindo B.,Instituto Tecnologico del Plastico | Alcolea S.G.,Avanzare Innovacion Teclogica | Gomez J.,Avanzare Innovacion Teclogica | Navas A.,Institute Tecnologias Quimicas Of La Rioja Inter Quimica | And 3 more authors.
IOP Conference Series: Materials Science and Engineering | Year: 2014

In this paper graphene and few layers graphene were synthesized by a modified Hummers method using flake graphite powders as the starting material. The effect of the incorporation of graphene on the electrical properties of thermoplastic polyurethane (TPU) was investigated via two processing techniques: solution blending and melt compounding. When solution blending is used for the preparation of composites, the obtained electrical conductivity is higher, even at very low loads (0,25% w/w). Moreover, the single layer graphene shows 10.000 times higher electrical conductivity than few layers graphene.


Menes O.,Instituto Tecnologico del Plastico | Cano M.,CSIC - Institute of Carbochemistry | Benedito A.,Instituto Tecnologico del Plastico | Gimenez E.,Polytechnic University of Valencia | And 3 more authors.
Composites Science and Technology | Year: 2012

Composites of thermoplastic polyurethane (TPU) and ultra-thin graphite (UTG) with concentrations ranging from 0.5. wt.% to 3. wt.% were prepared using a solution compounding strategy. Substantial reinforcing effects with increased loadings are achieved. Compared to neat TPU, values for storage modulus and shear viscosity are enhanced by 300% and 150%, respectively, for UTG concentrations of 3. wt.%. Additionally, an enhancement of thermal properties is accomplished. The crystallization temperature and thermal stability increased by 30. °C and 10. °C, respectively, compared to neat TPU. Furthermore, the use of oxidized UTG (UTGO) with its added functional oxygen groups suggests the presence of chemical interactions between UTG and TPU, which additionally impact on the thermal properties of the corresponding composites. Controlling the oxidation degree, thus offers further possibilities to obtain composites with tailored properties. The presented approach is straightforward, leads to homogeneous TPU-UTG composites with improved materials properties and is especially suitable for commercial UTG materials and further up-scaled production. © 2012 Elsevier Ltd.


Garrain D.,Jaume I University | Vidal R.,Jaume I University | Martinez P.,Instituto Tecnologico Del Plastico | Munoz C.,Jaume I University
Informacion Tecnologica | Year: 2010

This study focuses on the evaluation of the environmental impact of the most common industrial processes used in metallic coating processes of thermoplastics. Among these, conductive painting, chemical metal deposition and high-vacuum metal deposition are considered. The methodology used was the Life Cycle Assessment methodology. The results show that conductive coating painting has the greatest environmental impact, especially due to the emission of volatile organic compounds. High-vacuum metal deposition exhibits the best environmental performance, with minimal raw material and energy consumptions throughout the process. However, the high cost associated with the purchase of the required equipment for the high vacuum technique have made conductive coating painting the most commonly used process.


Rodriguez-Vidal E.,IK4 TEKNIKER | Quintana I.,IK4 TEKNIKER | Gadea C.,Instituto Tecnologico Del Plastico
Optics and Laser Technology | Year: 2014

This paper reports a study of the laser transmission welding of polymeric joints composed by two ABS (acrylonitrile/butadiene/styrene) sheets, one transparent (natural ABS) and the other absorbent (filled by different percentages of carbon nanotubes (CNTs)). The objective of this work is to analyze the effect of process parameters and CNTs concentrations on weld formation and mechanical resistance of the weld joints. Thermal and optical characterizations of natural and doped ABS sheets are studied. Microscopic characterization of the top and cross sections of the joining were carried out to study the corresponding weld widths and integrity. The mechanical resistance of the optimal welded joints was checked by mechanical shear tests. The welding capability was investigated as a function of the filler concentration. The results concerning weld formation and material integrity suggest a high sensitivity of the doped ABS with high concentration of CNTs to specific changes in the incident laser intensity. This sensitivity changes can be related with the changes in the optical properties of the doped polymer. © 2013 The Authors. Published by Elsevier Ltd All rights reserved.


Santos C.S.C.,University of Aveiro | Gabriel B.,University of Aveiro | Blanchy M.,R and D unit Rescoll | Menes O.,Instituto Tecnologico del Plastico | And 4 more authors.
Materials Today: Proceedings | Year: 2015

Nanotechnology describes the characterization, fabrication and manipulation of structures, devices or materials that have one or more dimensions that are smaller than 100 nanometers. This area has established itself as a key enabling technology for a wide range of applications, thus becoming a top priority for science and technology policy development, being already used in hundreds of products among the industrial sector, namely, electronic, healthcare, chemical, cosmetics, composites and energy. Despite the development in this area, there are some obstacles to a greater impact of nanotechnology in industry. The lack of information concerning this scientific area, the possibility of adverse impacts of nanotechnology on the environment, human health, safety and sustainability, are still a challenge. This article intends to briefly the prototypes being developed with in the CarbonIspired 2.0 consortium, given with them examples of practical applications, security issues and market challenges in order to an effective collaboration between the academies, research centers and the industrial sector. © 2015 Elsevier Ltd.


Benedito A.,Instituto Tecnologico del Plastico | Buezas I.,Instituto Tecnologico del Plastico | Gimenez E.,Instituto Tecnologico del Plastico | Gimenez E.,Polytechnic University of Valencia | Galindo B.,Instituto Tecnologico del Plastico
AIP Conference Proceedings | Year: 2010

The dispersion of multi-walled carbon nanotubes in thermoplastic polyurethanes has been done in co-rotative twin screw extruder through a melt blending process. A specific experimental design was prepared taking into account different compounding parameters such as feeding, temperature profile, screw speed, screw design, and carbon nanotube loading. The obtained samples were characterized by thermogravimetric analysis (TGA), light transmission microscopy, dynamic rheometry, and dynamic mechanical analysis. The objective of this work has been to study the dispersion quality of the carbon nanotubes and the effect of different compounding parameters to optimize them for industrial scale-up to final applications. © 2010 American Institute of Physics.


Diaz E.,Instituto Tecnologico del Plastico | Sanz C.,Instituto Tecnologico del Plastico | Garcia-Manrique J.A.,Polytechnic University of Valencia
16th European Conference on Composite Materials, ECCM 2014 | Year: 2014

The main objective of the present work is the development of an original and innovative approach for the optimal design of the vacuum assisted resin transfer moulding processes as a suitable technology for composites manufacturing. It consists of a simplified system which is able to reduce the necessary effort for the optimization of the process and to avoid the trial and error strategy in favour of the virtual prototyping in the development of the tools required. In this paper a new design methodology has been proposed for the manufacture of composite parts by means of the definition of the flexible permeability.

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