RT info:eu-repo/semantics/article
T1 Silica-based aerogel composites reinforced with reticulated polyurethane foams: Thermal and mechanical properties
A1 Merillas Valero, Beatriz
A1 Lamy Mendes, Alyne
A1 Villafañe González, Fernando
A1 Durães, Luisa
A1 Rodríguez Pérez, Miguel Ángel
K1 Polymers
K1 Composite materials
K1 Polyurethane foam
K1 Espumas poliméricas de poliuretano - Propiedade mecánicas
K1 Thermal insulation
K1 Aislamiento térmico
K1 Condensed matter
K1 Física de la materia condensada
K1 Gels
K1 Aerogel
K1 Chemistry
K1 23 Química
K1 2211.02 Materiales Compuestos
K1 2206.10 Polímeros
AB 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).
PB MDPI
SN 2310-2861
YR 2022
FD 2022
LK https://uvadoc.uva.es/handle/10324/61879
UL https://uvadoc.uva.es/handle/10324/61879
LA eng
NO Gels, 2022, Vol. 8, Nº. 7, 392
NO Producción Científica
DS UVaDOC
RD 24-nov-2024