Enviaments recents

  • New epoxy thermosets modified with multiarm star poly(lactide) with poly(ethyleneimine) as core of different molecular weight 

    Acebo Gorostiza, Cristina; Fernández Francos, Xavier; Ferrando Piera, Francesc; Serra Albet, Àngels; Ramis Juan, Xavier (2013-08)
    Article
    Accés restringit per política de l'editorial
    Multiarm stars containing a hyperbranched poly(ethyleneimine) core of different molecular weight and poly(lactide) arms were synthesized by cationic ring-opening polymerization of lactide from a hyperbranched poly(ethyleneimine) ...
  • Assessment tasks: center of the learning process 

    Martínez Martínez, María del Rosario; Amante García, Beatriz; Cadenato Matia, Ana María; Gallego Fernández, María Isabel (2012-05-01)
    Article
    Accés restringit per política de l'editorial
    Assessment is at the centre of learning process, and is what therefore determinates the process of teaching-learning. It is because of this, the assessment tasks must be designed with several criteria which guarantee its ...
  • New catalysts for diglycidyl ether of bisphenol A curing based on thiol-epoxy click reaction 

    Guzmán, Daylin; Ramis Juan, Xavier; Fernández Francos, Xavier; Serra Albet, Àngels (2014-10-01)
    Article
    Accés restringit per política de l'editorial
    The thiol-epoxy click reaction has been employed in the curing of diglycidyl ether of bisphenol A (DGEBA) using latent amine precursors in ratios of 0.5 and 2 phr. The kinetics of the curing of mixtures of DGEBA/thiol/amine ...
  • Thermal analysis of polymer layered silicate nanocomposites. Identification of nanostructure development by DSC 

    Shiravand, Fatemeh; Fraga Rivas, Iria; Cortés Izquierdo, M. Pilar; Calventus Solé, Yolanda; Hutchinson, John M. (2014-11-01)
    Article
    Accés restringit per política de l'editorial
    It has been shown, for three different polymer layered silicate (PLS) nanocomposite systems, how differential scanning calorimetry (DSC) can identify the different reactions of homopolymerisation and of crosslinking that ...
  • Analysis of assessment tools used in engineering degree programs 

    Martínez Martínez, María del Rosario; Olmedo Torre, Noelia; Amante García, Beatriz; Farrerons Vidal, Óscar; Cadenato Matia, Ana María (2014-10-01)
    Article
    Accés obert
    This work presents an analysis of the assessment tools used by professors at the Universitat Politécnica de Catalunya to assess the generic competencies introduced in the Bachelor’s Degrees in Engineering. In order to ...
  • New epoxy thermosets modified with amphiphilic multiarm star polymers as toughness enhancer 

    Lagunas Calpe, Carlos; Fernández Francos, Xavier; Ferrando Piera, Francesc; Flores Guillen, Marjorie; Serra Albet, Àngels; Morancho Llena, José María; Salla Tarragó, José María; Ramis Juan, Xavier (2014-10-01)
    Article
    Accés restringit per política de l'editorial
    The synthesis and characterization of two novel amphiphilic multiarm star polymers with linear polyethylene glycol (PEG) and poly(s-caprolactone) (PCL) arms and their use as toughening modifiers of epoxy anhydride thermosets ...
  • Cure kinetics modeling and thermomechanical properties of cycloaliphatic epoxy-anhydride thermosets modified with hyperstar polymers 

    Belmonte, Alberto; Daebritz, Frank; Ramis Juan, Xavier; Serra Albet, Àngels; Void, Brigitte; Fernández Francos, Xavier (2014-09-15)
    Article
    Accés restringit per política de l'editorial
    Hyperstar polymers (HSPs) with hyperbranched aromatic polyester core and arms consisting of block copolymers of poly(methyl methacrylate) and poly(hydroxyethyl methacrylate) have been used as polymeric modifiers in ...
  • Novel epoxy-silica hybrid coatings by using ethoxysilyl-modified hyperbranched poly(ethyleneimine) with improved scratch resistance 

    Acebo Gorostiza, Cristina; Fernández Francos, Xavier; Messori, Massimo; Ramis Juan, Xavier; Serra Albet, Àngels (Elsevier, 2014-09-26)
    Article
    Accés restringit per política de l'editorial
    A new hyperbranched poly(ethyleneimine) with ethoxysilyl groups at the chain ends has been synthesized and characterized and then used in epoxy formulations to generate new organic/inorganic hybrid materials. Formulations ...
  • Effect of hydroxyl ended and end-capped multiarm star polymers on the curing process and mechanical characteristics of epoxy/anhydride thermosets 

    Acebo Gorostiza, Cristina; Picardi, Annamaria; Fernández Francos, Xavier; de la Flor López, Sílvia; Ramis Juan, Xavier; Serra Albet, Àngels (2014-08-01)
    Article
    Accés restringit per política de l'editorial
    Multiarm star polymers have been synthesized by cationic ring-opening polymerization of epsilon-caprolactone from a hyperbranched poly(ethyleneimine) core and end-capped with acetic anhydride. These star polymers have been ...
  • Comparative analysis of stochastic network build-up methods for the curing of epoxy-anhydride thermosets 

    Fernández Francos, Xavier; Serra Albet, Àngels; Ramis Juan, Xavier (2014-04-01)
    Article
    Accés restringit per política de l'editorial
    The network build-up of epoxy-anhydride thermosets has been studied using two different stochastic network build-up methods based on the random combination of primary chains or simple fragments. Explicit expressions for ...

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