RT info:eu-repo/semantics/article
T1 Super-insulating transparent polyisocyanurate-polyurethane aerogels: Analysis of thermal conductivity and mechanical properties
A1 Merillas Valero, Beatriz
A1 Villafañe González, Fernando
A1 Rodríguez Pérez, Miguel Ángel
K1 Polymers
K1 Polyurethane foam
K1 Espumas poliméricas de poliuretano - Propiedade mecánicas
K1 Composite materials
K1 Gels
K1 Aerogel
K1 Thermal insulation
K1 Aislamiento térmico
K1 Mechanical properties
K1 Chemistry
K1 Materials science
K1 Polyisocyanurate
K1 Poliisocianurato
K1 23 Química
K1 2206.10 Polímeros
K1 2211.02 Materiales Compuestos
AB A family of transparent polyisocyanurate-polyurethane (PUR-PIR) aerogels with an interesting combination of physical properties were synthesized. First, their textural properties were analyzed aiming to study catalyst influence on the final porous structures and densities. Their thermal conductivities were measured at different temperatures allowing observation of a clear trend relating the initial formulation with the porous structure and reaching values as low as 12 mW/mK, the lowest found in the literature for aerogels based on this polymer matrix. Contributions to thermal conductivity were calculated, improving the understanding of the porous structure-insulating performance relationship. Moreover, their mechanical properties were studied (elastic modulus, stress at different strains and elastic behavior). The aerogels showed tunable stiffness (elastic modulus from 6.32 to 0.13 MPa) by changing the catalyst concentration and significant elasticity. Thus, super-insulating transparent PUR-PIR aerogels with tailored mechanical properties were obtained opening a wide range of potential applications in the energy, building, automotive and aeronautical sectors, among others. The exceptional insulation of silica aerogels was reached at the same time that their general brittleness was improved while keeping good transparency to visible light (85%, 650 nm). Therefore, these aerogels may constitute an alternative to silica aerogels.
PB MDPI
SN 2079-4991
YR 2022
FD 2022
LK https://uvadoc.uva.es/handle/10324/61936
UL https://uvadoc.uva.es/handle/10324/61936
LA eng
NO Nanomaterials, 2022, Vol. 12, Nº. 14, 2409
NO Producción Científica
DS UVaDOC
RD 22-dic-2024