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    Por favor, use este identificador para citar o enlazar este ítem:https://uvadoc.uva.es/handle/10324/61879

    Título
    Silica-based aerogel composites reinforced with reticulated polyurethane foams: Thermal and mechanical properties
    Autor
    Merillas Valero, BeatrizAutoridad UVA
    Lamy Mendes, Alyne
    Villafañe González, FernandoAutoridad UVA Orcid
    Durães, Luisa
    Rodríguez Pérez, Miguel ÁngelAutoridad UVA Orcid
    Año del Documento
    2022
    Editorial
    MDPI
    Descripción
    Producción Científica
    Documento Fuente
    Gels, 2022, Vol. 8, Nº. 7, 392
    Résumé
    In this work, silica aerogel composites reinforced with reticulated polyurethane (PU) foams have been manufactured having densities in the range from 117 to 266 kg/m3 and porosities between 85.7 and 92.3%. Two different drying processes were employed (ambient pressure drying and supercritical drying) and a surface modification step was applied to some of the silica formulations. These composites, together with the reference PU foam and the monolithic silica aerogels, were fully characterized in terms of their textural properties, mechanical properties and thermal conductivities. The surface modification with hexamethyldisilazane (HMDZ) proved to improve the cohesion between the reticulated foam and the silica aerogels, giving rise to a continuous network of aerogel reinforced by a polyurethane porous structure. The samples dried under supercritical conditions showed the best interaction between matrixes as well as mechanical and insulating properties. These samples present better mechanical properties than the monolithic aerogels having a higher elastic modulus (from 130 to 450 kPa), a really exceptional flexibility and resilience, and the capacity of being deformed without breaking. Moreover, these silica aerogel-polyurethane foam (Sil-PU) composites showed an excellent insulating capacity, reaching thermal conductivities as low as 14 mW/(m·K).
    Materias (normalizadas)
    Polymers
    Composite materials
    Polyurethane foam
    Espumas poliméricas de poliuretano - Propiedade mecánicas
    Thermal insulation
    Aislamiento térmico
    Condensed matter
    Física de la materia condensada
    Gels
    Aerogel
    Chemistry
    Materias Unesco
    23 Química
    2211.02 Materiales Compuestos
    2206.10 Polímeros
    ISSN
    2310-2861
    Revisión por pares
    SI
    DOI
    10.3390/gels8070392
    Patrocinador
    Ministerio de Ciencia, Innovación y Universidades - (grant FPU17/03299)
    Ministerio de Ciencia, Innovación y Universidades - (project RTI2018-098749-B-I00)
    Junta de Castilla y León - (Grant VA202P20)
    Junta de Castilla y León y Fondo Europeo de Desarrollo Regional (FEDER) - (grant CLU-2019-04)
    Short-Term Scientific Mission (STSM) - (grant 47454)
    Comisión Europea - (grant CA18125)
    Fundación Portuguesa para la Ciencia y la Tecnología - (projects UID/EQU/00102/2020)
    Version del Editor
    https://www.mdpi.com/2310-2861/8/7/392
    Propietario de los Derechos
    © 2022 The Authors
    Idioma
    eng
    URI
    https://uvadoc.uva.es/handle/10324/61879
    Tipo de versión
    info:eu-repo/semantics/publishedVersion
    Derechos
    openAccess
    Aparece en las colecciones
    • DEP63 - Artículos de revista [324]
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    Silica-Based-Aerogel-Composites.pdf
    Tamaño:
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