Investigación

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Documentos generados por los docentes e investigadores de la Universidad en su labor de investigación científica producida o editada por los departamentos y centros de la Universitat Politècnica de València.

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Browsing Investigación by Sponsor "Adolphe Merkle Foundation"

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    Publication
    Low-Power Upconversion in Poly(Mannitol-Sebacate) Networks with Tethered Diphenylanthracene and Palladium Porphyrin
    (Springer-Verlag, 2014-09) Lee, Soo-Hyon; Sonseca Olalla, Agueda; Vadrucci, Roberto; Giménez Torres, Enrique; Foster, E.J.; Simon, Yohan C.; Escuela Técnica Superior de Ingeniería del Diseño; Dpto. de Ingeniería Mecánica y de Materiales; Escuela Técnica Superior de Ingeniería Industrial; Instituto de Tecnología de Materiales; Adolphe Merkle Foundation; Swiss National Science Foundation; Ministerio de Ciencia e Innovación
    [EN] Efforts to fabricate low-power up converting solid-state systems have rapidly increased in the past decade because of their possible application in several fields such as bio-imaging, drug delivery, solar harvesting or displays. The synthesis of upconverting cross-linked polyester rubbers with covalently tethered chromophores is presented here. Cross-linked films were prepared by reacting a poly(mannitol- sebacate) pre-polymer with 9,10-bis(4-hydroxymethylphenyl) anthracene (DPA-(CH2OH)2) and palladium mesoporphyrin IX. These chromophores served as emitters and sensitizers, respectively, and through a cascade of photophysical events, resulted in an anti-Stokes shifted emission. Indeed, blue emission (*440 nm) of these solid materials was detected upon excitation at 543 nm with a green laser and the power dependence of integrated unconverted intensity versus excitation was examined. The new materials display upconversion at power densities as low as 32 mW/cm2, and do not display phase de-mixing, which has been identified as an obstacle in rubbery blends comprising untethered chromophores.
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    Mechanical and Shape-Memory Properties of Poly(mannitol sebacate)/Cellulose Nanocrystal Nanocomposites
    (John Wiley & Sons, 2014-11-01) Sonseca Olalla, Agueda; Camarero-Espinosa, Sandra; Peponi, Laura; Weder, Christoph; Foster, E.J.; Kenny, José M.; Giménez Torres, Enrique; Escuela Técnica Superior de Ingeniería del Diseño; Dpto. de Ingeniería Mecánica y de Materiales; Escuela Técnica Superior de Ingeniería Industrial; Instituto de Tecnología de Materiales; Ministerio de Educación; Adolphe Merkle Foundation; Swiss National Science Foundation; Consejo Superior de Investigaciones Científicas; Ministerio de Ciencia e Innovación
    [EN] Polyesters based on polyols and sebacic acid, known as poly(polyol sebacate)s (PPS), are attracting considerable attention, as their properties are potentially useful in the context of soft-tissue engineering applications. To overcome the drawback that PPSs generally display rather low strength and stiffness, we have pursued the preparation of nano composites based poly(mannitol sebacate) (PMS), a prominent example of this materials family, with cellulose nanocrystals (CNCs). Nanocomposites were achieved in a two-step process. A soluble, low-molecular-weight PMS pre-polymer was formed via the polycondensation reaction between sebacic acid and D-mannitol. Nanocomposites with different CNC content were prepared by solution-casting and curing under vacuum using two different profiles designed to prepare materials with low and high degree of crosslinking. The as-prepared nano composites have higher stiffness and toughness than the neat PMS matrix while maintaining a high elongation at break. A highly crosslinked nanocomposite with a CNC content of 5 wt % displays a sixfold increase in Young s modulus and a fivefold improvement in toughness. Nanocomposites also exhibit a shape memory effect with a switch temperature in the range of 15 to 45 C; in particular the materials with a thermal transition in the upper part of this range are potentially useful for biomedical applications