Now showing items 21-40 of 71

  • Enhanced electrical conductivity in graphene-filled polycarbonate nanocomposites by microcellular foaming with sc-CO2 

    Gedler, Gabriel; Antunes, Marcelo de Sousa Pais; Velasco Perero, José Ignacio (2016-01)
    Article
    Open Access
    Electrically conductive polycarbonate (PC) foams containing a low concentration of graphene nanoplatelets (0.5 wt.%) were produced with variable range of expansion ratio by applying a high-pressure batch foaming process ...
  • Enhanced electromagnetic interference shielding effectiveness of polycarbonate/graphene nanocomposites foamed via 1-step supercritical carbon dioxide process 

    Gedler, Gabriel; Antunes, Marcelo de Sousa Pais; Velasco Perero, José Ignacio; Ozisik, Rahmi (2016-01)
    Article
    Open Access
    The dielectric and electromagnetic interference (EMI) shielding properties of polycarbonate/graphene nanocomposites foamed using supercritical carbon dioxide were studied as a function of their cellular and compositemorphology. ...
  • Enhanced fire behavior of Casico-based foams 

    Redondo Realinho, Vera Cristina de; Antunes, Marcelo de Sousa Pais; Velasco Perero, José Ignacio (2016-06)
    Article
    Open Access
    The present work deals with the preparation and characterization of improved fire-retardant ethylene-acrylate foams. A commercial formulation, usually employed in the cable industry sector, Casico, was modified using two ...
  • Enhancing the electrical conductivity of polyetherimide-based foams by simultaneously increasing the porosity and graphene nanoplatelets dispersion 

    Abbasi, Hooman; Antunes, Marcelo de Sousa Pais; Velasco Perero, José Ignacio (2018-09-19)
    Article
    Restricted access - publisher's policy
    Significant improvement in electrical conductivity of graphene nanoplatelets-filled polyetherimide (PEI) foams was achieved by simultaneously increasing the porosity and graphene nanoplatelets dispersion. Foams were prepared ...
  • Esparto wool as reinforcement in hybrid polyurethane composite foams 

    Antunes, Marcelo de Sousa Pais; Cano, Álvaro; Haurie Ibarra, Laia; Velasco Perero, José Ignacio (2011-11)
    Article
    Restricted access - publisher's policy
    In the present work polyurethane foams containing variable concentrations of nano-sized clay and esparto wool were prepared and studied, with the objective of developing new multi-scalar rigid foams. The addition of ...
  • Espumas ignífugas de poliolefina libres de halógenos 

    Redondo Realinho, Vera Cristina de; Antunes, Marcelo de Sousa Pais; Haurie Ibarra, Laia; Maspoch Rulduà, Mª Lluïsa; Velasco Perero, José Ignacio (2012)
    Conference report
    Open Access
    En el presente trabajo se han preparado y caracterizado espumas ignífugas de poliolefinas libres de halógenos. Se ha utilizado para ello una formulación comercial, empleada típicamente en la industria de cables, y se le ...
  • Essential work of fracture (EWF): a useful tool for the fracture toughness characterization of particulate polyolefin composites 

    Arencón Osuna, David; Antunes, Marcelo de Sousa Pais; Velasco Perero, José Ignacio (Nova Science Publishers, 2011-01-03)
    Part of book or chapter of book
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    The characterization of the fracture toughness of polyolefin composites filled with inorganic particles is commonly solved by means of standardized testing procedures based wherther on the Linear Elastic Fracture Mechanics ...
  • Foamed polypropylene for industrial applications 

    Antunes, Marcelo de Sousa Pais; Velasco Perero, José Ignacio (Nova Science Publishers, 2013)
    Part of book or chapter of book
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    There is a great deal of industrial interest in the development of increasingly lighter materials based on polymer foams with improved specific properties for the most varied purposes, from flexible foams for packaging to ...
  • Foaming behaviour, structure, and properties of polypropylene nanocomposite foams 

    Antunes, Marcelo de Sousa Pais; Redondo Realinho, Vera Cristina de; Velasco Perero, José Ignacio (Hindawi Publishing Corporation, 2010)
    Article
    Open Access
    This work presents the preparation and characterization of compression-moulded montmorillonite and carbon nanofibre-polypropylene foams. The influence of these nanofillers on the foaming behaviour was analyzed in terms of ...
  • Foaming of polypropylene by using both chemical and physical blowing agents. A comparative study of the structure and physical properties 

    Saiz-Arroyo, Cristina; Rodríguez-Pérez, Miguel Ángel; Antunes, Marcelo de Sousa Pais; Velasco Perero, José Ignacio; Saja, José Antonio de (2010)
    Conference report
    Restricted access - publisher's policy
    Microcellular foams have focused attention of researches due to improvement in some properties when compared to conventional foams. Several production routes for these materials have been developed although most of them ...
  • Fracture behaviour of flexible polyethylene foams for potential use in damping applications 

    Velasco Perero, José Ignacio; Antunes, Marcelo de Sousa Pais; Arencón Osuna, David; Martínez Benasat, Antonio (Trans Tech Publications, 2011-09)
    Article
    Restricted access - publisher's policy
    The application of the essential work of fracture (EWF) methodology for the fracture behavior characterization of closed-cell low density polyethylene flexible foams is discussed in the present paper. The thickness of ...
  • Graphene-induced crystallinity of bisphenol A polycarbonate in the presence of supercritical carbon dioxide 

    Gedler, Gabriel; Antunes, Marcelo de Sousa Pais; Velasco Perero, José Ignacio (Elsevier, 2013-11-01)
    Article
    Restricted access - publisher's policy
    Changes in the crystallinity of polycarbonate (PC) induced by the simultaneous presence of 0.5 wt% graphene nanoplatelets (GnP) and supercritical carbon dioxide (sc-CO2) were examined by means of Raman spectroscopy, WAXS, ...
  • Graphene nanoplatelets as a multifunctional filler for polymer foams 

    Antunes, Marcelo de Sousa Pais; Gedler, Gabriel; Abbasi, Hooman; Velasco Perero, José Ignacio (Elsevier, 2016-03)
    Article
    Open Access
    Due to their high mechanical and transport properties, graphene-derived materials have aroused a great deal of interest in the most varied sectors. Among these, graphene nanoplatelets have been gaining interest due to the ...
  • Graphene nanoplatelets-reinforced polyetherimide foams prepared by water vapor-induced phase separation 

    Abbasi, Hooman; Antunes, Marcelo de Sousa Pais; Velasco Perero, José Ignacio (2015-05)
    Article
    Restricted access - publisher's policy
    The present work considers the preparation of medium-density polyetherimide foams reinforced with variable amounts of graphene nanoplatelets (1–10 wt%) by means of water vapor-induced phase separation (WVIPS) and their ...
  • Halogen-free flame retardant polyolefin foams 

    Redondo Realinho, Vera Cristina de; Antunes, Marcelo de Sousa Pais; Santana Pérez, Orlando Onofre; Velasco Perero, José Ignacio (2012)
    Conference report
    Restricted access - publisher's policy
    The present work deals with the preparation and characterizacion of an improved fire-resistant ethylene-acrylate foamed material containing calcium carbonate and a silicon elastomer. This grade, usually employed on the ...
  • Heat transfer in polyolefin foams 

    Antunes, Marcelo de Sousa Pais; Velasco Perero, José Ignacio; Solórzano Quijano, Eusebio; Rodríguez-Pérez, Miguel Ángel (Springer-Verlag, 2011)
    Part of book or chapter of book
    Restricted access - confidentiality agreement
    This chapter is dedicated to the study of heat transfer in polyolefin-based foams, particularly thermal conductivity, as a function of their structure and chemical composition. A small review of the main experimental ...
  • Heat transfer in polypropylene-based foams produced using different foaming processes 

    Antunes, Marcelo de Sousa Pais; Velasco Perero, José Ignacio; Redondo Realinho, Vera Cristina de; Martínez Velasco, Antonio Benito; Rodríguez-Pérez, Miguel Ángel; Saja, José Antonio de (Wiley, 2009-10)
    Article
    Restricted access - publisher's policy
    This paper presents the characterization of the cellular structure and thermal conduction behaviour of polypropylene foams produced using different foaming processes, with the aim of selecting the best possible PP foam ...
  • Heat Transfer of Mineral-Filled Polypropylene Foams 

    Antunes, Marcelo de Sousa Pais; Redondo Realinho, Vera Cristina de; Martínez Benasat, Antonio; Solórzano Quijano, Eusebio; Rodríguez-Pérez, Miguel Ángel; Velasco Perero, José Ignacio (Trans Tech Publications, 2010)
    Article
    Restricted access - publisher's policy
    The thermal conductivity of unfilled polypropylene foams produced using different foaming processes has previously been demonstrated to be mainly affected by the foam’s bulk density [1]. The influence of adding inorganic ...
  • Influence of chemical nature, expansion ratio and cellular morphology on the fracture behaviour of flexible polyolefin-based foams assessed by the Essential Work of Fracture (EWF) 

    Arencón Osuna, David; Antunes, Marcelo de Sousa Pais; Redondo Realinho, Vera Cristina de; Velasco Perero, José Ignacio (2015-05)
    Article
    Open Access
    Several commercial polyolefin-based flexible foams produced by extrusion foaming were characterized in terms of their cellular morphology and fracture behaviour using the concept of the Essential Work of Fracture (EWF), ...
  • Influence of polyamide-imide concentration on the cellular structure and thermo-mechanical properties of polyetherimide/polyamide-imide blend foams 

    Abbasi, Hooman; Antunes, Marcelo de Sousa Pais; Velasco Perero, José Ignacio (2015-08)
    Article
    Restricted access - publisher's policy
    The present work considers the preparation of medium-density polyetherimide (PEI)/polyamide-imide (PAI) blend foams by means of water vapor-induced phase separation (WVIPS) and their characterization. While pure polymer ...