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Título
Silica-based aerogel composites reinforced with reticulated polyurethane foams: Thermal and mechanical properties
Autor
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
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)
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
Propietario de los Derechos
© 2022 The Authors
Idioma
eng
Tipo de versión
info:eu-repo/semantics/publishedVersion
Derechos
openAccess
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