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    Por favor, use este identificador para citar o enlazar este ítem:http://uvadoc.uva.es/handle/10324/25887

    Título
    Low density nanocellular polymers based on PMMA produced by gas dissolution foaming: Fabrication and cellular structure characterization
    Autor
    Martín de León, JuditAutoridad UVA
    Bernardo García, VictoriaAutoridad UVA
    Rodríguez Pérez, Miguel ÁngelAutoridad UVA Orcid
    Año del Documento
    2016
    Editorial
    MDPI
    Descripción
    Producción Científica
    Documento Fuente
    Polymers, 2016, vol. 8, n. 9. 16 p.
    Resumo
    This paper describes the processing conditions needed to produce low density nanocellular polymers based on polymethylmethacrylate (PMMA) with relative densities between 0.45 and 0.25, cell sizes between 200 and 250 nm and cell densities higher than 1014 cells/cm3. To produce these nanocellular polymers, the foaming parameters of the gas dissolution foaming technique using CO2 as blowing agent have been optimized. Taking into account previous works, the amount of CO2 uptake was maintained constant (31% by weight) for all the materials. Foaming parameters were modified between 40 C and 110 C for the foaming temperature and from 1 to 5 min for the foaming time. Foaming temperatures in the range of 80 to 100 C and foaming times of 2 min allow for production of nanocellular polymers with relative densities as low as 0.25. Cellular structure has been studied in-depth to obtain the processing-cellular structure relationship. In addition, it has been proved that the glass transition temperature depends on the cellular structure. This effect is associated with a confinement of the polymer in the cell walls, and is one of the key reasons for the improved properties of nanocellular polymers.
    Palabras Clave
    Nanocellular polymers
    Polímeros nanocelulares
    Nanocellular foams
    Espumas nanocelulares
    Polymethylmethacrylate
    Polimetilmetacrilato
    ISSN
    2073-4360
    Revisión por pares
    SI
    DOI
    10.3390/polym8070265
    Patrocinador
    Ministerio de Economía, Industria y Competitividad - Fondo Europeo de Desarrollo Regional (projects MAT 2012-34901 and MAT2015-69234-R)
    Junta de Castilla y León (project VA035U13 and grant Q4718001C)
    Ministerio de Educación y Formación Profesional (grant FPU14/02050)
    Version del Editor
    https://www.mdpi.com/2073-4360/8/7/265/htm
    Propietario de los Derechos
    © 2016 MDPI
    Idioma
    eng
    URI
    http://uvadoc.uva.es/handle/10324/25887
    Derechos
    openAccess
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    Universidad de Valladolid

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