RT info:eu-repo/semantics/article
T1 Improving the insulating capacity of polyurethane foams through polyurethane aerogel inclusion: From insulation to superinsulation
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 Mechanical properties
K1 Composite materials
K1 Gels
K1 Aerogel
K1 Thermal insulation
K1 Aislamiento térmico
K1 Condensed matter
K1 Física de la materia condensada
K1 Chemistry
K1 23 Química
K1 2206.10 Polímeros
K1 2211.02 Materiales Compuestos
AB A novel synthesis of polyurethane foam/polyurethane aerogel (PUF–PUA) composites is presented. Three different polyurethane reticulated foams which present the same density but different pore sizes (named S for small, M for medium, and L for large) have been used. After the characterization of the reference materials (either, foams, and pure aerogel), the obtained composites have been characterized in order to study the effect of the foam pore size on the final properties, so that density, shrinkage, porous structure, mechanical properties, and thermal conductivity are determined. A clear influence of the pore size on the density and shrinkage was found, and the lowest densities are those obtained from L composites (123 kg/m3). Moreover, the aerogel density and shrinkage have been significantly reduced through the employment of the polyurethane (PU) foam skeleton. Due to the enhanced mechanical properties of polyurethane aerogels, the inclusion of polyurethane aerogel into the foam skeleton helps to increase the elastic modulus of the foams from 0.03 and 0.08 MPa to 0.85 MPa, while keeping great flexibility and recovery ratios. Moreover, the synthesized PUF–PUA composites show an excellent insulating performance, reducing the initial thermal conductivity values from 34.1, 40.3, and 50.6 mW/(m K) at 10 °C for the foams S, M, and L, to 15.8, 16.6, and 16.1 mW/(m K), respectively. Additionally, the effect of the different heat transfer mechanisms to the total thermal conductivity is herein analyzed by using a theoretical model as well as the influence of the measurement temperature.
PB MDPI
SN 2079-4991
YR 2022
FD 2022
LK https://uvadoc.uva.es/handle/10324/61898
UL https://uvadoc.uva.es/handle/10324/61898
LA eng
NO Nanomaterials, 2022, Vol. 12, Nº. 13, 2232
NO Producción Científica
DS UVaDOC
RD 17-jul-2024