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Escarcega-Bobadilla M.V.,Institute of Chemical Research of Catalonia | Zelada-Guillen G.A.,Polymaterials AG | Pyrlin S.V.,University of Minho | Pyrlin S.V.,Moscow State Technical University | And 7 more authors.
Nature Communications | Year: 2013

Molecular electronics based on structures ordered as neural networks emerges as the next evolutionary milestone in the construction of nanodevices with unprecedented applications. However, the straightforward formation of geometrically defined and interconnected nanostructures is crucial for the production of electronic circuitry nanoequivalents. Here we report on the molecularly fine-tuned self-assembly of tetrakis-Schiff base compounds into nanosized rings interconnected by unusually large nanorods providing a set of connections that mimic a biological network of neurons. The networks are produced through self-assembly resulting from the molecular conformation and noncovalent intermolecular interactions. These features can be easily generated on flat surfaces and in a polymeric matrix by casting from solution under ambient conditions. The structures can be used to guide the position of electron-transporting agents such as carbon nanotubes on a surface or in a polymer matrix to create electrically conducting networks that can find direct use in constructing nanoelectronic circuits. © 2013 Macmillan Publishers Limited. All rights reserved. Source


Wegrzyn M.,Instituto Tecnologico Del Plastico AIMPLAS | Galindo B.,Instituto Tecnologico Del Plastico AIMPLAS | Benedito A.,Instituto Tecnologico Del Plastico AIMPLAS | Gimenez E.,Polytechnic University of Valencia
Journal of Applied Polymer Science | Year: 2015

In this study, nanocomposites of polypropylene (PP) with various loadings of multi-wall carbon nanotubes (MWCNT) and graphene nanoplatelets (GnP) were formed by masterbatch dilution/mixing approach from individual masterbatches PP-MWCNT and PP-GnP. Melt mixing on a twin-screw extruder at two different processing temperatures was followed by characterization of morphology by transmitted-light microscopy including the statistical analysis of agglomeration behavior. The influence of processing temperature and weight fractions of both nanofillers on the dispersion quality is reported. Thermal properties of the nanocomposites investigated by DSC and TGA show sensitivity to the nanofillers weight fraction ratio and to processing conditions. Electrical conductivity is observed to increase up to an order of magnitude with the concentration of each nanofiller increasing from 0.5 wt % to 1.0 wt %. This is related with a decrease of electrical conductivity observed for unequal concentration of both nanofillers. This particular behavior shows the increase of electrical properties for higher MWCNT loadings and the increase of thermo-mechanical properties for higher GnP loadings. © 2015 Wiley Periodicals, Inc. Source


Wegrzyn M.,Instituto Tecnologico Del Plastico AIMPLAS | Juan S.,Instituto Tecnologico Del Plastico AIMPLAS | Benedito A.,Instituto Tecnologico Del Plastico AIMPLAS | Gimenez E.,Polytechnic University of Valencia
Journal of Applied Polymer Science | Year: 2013

The influence of injection molding parameters on electrical properties and morphology of PC/ABS-MWCNT nanocomposites is presented in this article. Investigation is based on the masterbatch of 5.0 wt % carbon nanotubes obtained by melt-mixing. Further processing includes dilution of this nanocomposite to desired concentrations on twin-screw extruder and injection molding or direct dilution of masterbatch in injection molding. Additionally, reprocessing of materials formed by compression and injection molding is presented along with the change in electrical conductivity. Morphology differs strongly between the two processing paths showing change in agglomeration behavior between nanotubes concentrations. Electrical properties show dependence on injection velocity and melt temperature in both applied processing paths. Moreover, electrical conductivity recovery is proved after injection and compression molding. © 2013 Wiley Periodicals, Inc. Source


Wegrzyn M.,Instituto Tecnologico Del Plastico AIMPLAS | Benedito A.,Instituto Tecnologico Del Plastico AIMPLAS | Gimenez E.,Polytechnic University of Valencia
Journal of Beijing Institute of Technology (English Edition) | Year: 2013

The influence of injection molding parameters on electrical properties and the distribution of phases inside the formed specimen were investigated on immiscible blend: polycarbonate/acrylonitrile-butadiene-styrene (PC/ABS) filled with multi-walled carbon nanotubes (MWCNT). This work was established to meet market demand on clear and predictable nanocomposite processing. Nanocomposites formed from pre-dispersed masterbatch were shaped at various melt temperatures and injection velocities. Electrical performance achieved in these specimens was investigated with the respect to processing parameters and strong dependences were observed. Besides, morphology (investigated with light-transmission microscopy, OM and scanning electron microscopy, SEM) and MWCNT distribution inside the specimen (investigated with Raman spectroscopy) were determined and co-related with the previous results. Affinity of the nanofiller with polycarbonate and the presence of nanofiller agglomerates after processing are shown. The tendency of MWCNT location in the area far from injection gate is shown. The work is concluded and key aspects of injection molding of multi-walled carbon nanotubes-filled polymers are pointed out. © Right. Source


Marcin W.,Instituto Tecnologico Del Plastico AIMPLAS | Benedito A.,Instituto Tecnologico Del Plastico AIMPLAS | Gimenez E.,University of Valencia
Journal of Applied Polymer Science | Year: 2014

Nanocomposites of polycarbonate/acrylonitrile-butadiene-styrene (PC/ABS) with multiwall carbon nanotubes (MWCNT) prepared by masterbatch dilution are investigated in this work. Melt compounding with twin screw extruder is followed by complete characterization of morphology, rheological-, mechanical-, and thermal-properties of the nanocomposites. Light-transmission- and scanning electron microscopy shows the preferential location of MWCNT in the PC. Nevertheless, relatively good dispersion in the whole matrix is achieved, what is corroborated with the specific mechanical energy. The study of viscoelastic properties of PC/ABS-MWCNT shows the fluid-solid transition below 0.5 wt % MWCNT. Beyond this point the continuous nanofiller network is formed in the matrix promoting the reinforcement. Addition of 0.5 wt % MWCNT reduces ductility of PC/ABS and enhances Young's modulus by about 30% and yield stress by about 20%. Moreover, theoretical values of stiffness calculated within this work agree with the experimental data. Electrical conductivity, showing percolation at 2.0 wt % MWCNT, are influenced by processing temperature. © 2013 Wiley Periodicals, Inc. Source

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