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oai:uvadoc.uva.es:10324/618982023-10-06T19:01:22Zcom_10324_1186com_10324_931com_10324_894col_10324_1404

Merillas Valero, Beatriz 25cdbf61a145bfe5 600 Villafañe González, Fernando becaf8177767a254 600 0000-0002-3230-3802 Rodríguez Pérez, Miguel Ángel 3a2115f06f0d71f7 600 2023-10-06T08:08:23Z 2023-10-06T08:08:23Z 2022 Nanomaterials, 2022, Vol. 12, Nº. 13, 2232 2079-4991 https://uvadoc.uva.es/handle/10324/61898 10.3390/nano12132232 2232 13 Nanomaterials 12 2079-4991 Producción Científica 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. 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 y Ente Público Regional de la Energía de Castilla y León (EREN) - (Grant VA202P20) Junta de Castilla y León y Fondo Europeo de Desarrollo Regional (FEDER) - (grant CLU-2019-04) application/pdf eng MDPI info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/4.0/ © 2022 The Authors Atribución 4.0 Internacional Polymers Polyurethane foam Espumas poliméricas de poliuretano - Propiedade mecánicas Mechanical properties Composite materials Gels Aerogel Thermal insulation Aislamiento térmico Condensed matter Física de la materia condensada Chemistry 23 Química 2206.10 Polímeros 2211.02 Materiales Compuestos Improving the insulating capacity of polyurethane foams through polyurethane aerogel inclusion: From insulation to superinsulation info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion https://www.mdpi.com/2079-4991/12/13/2232 SI THUMBNAIL Improving-the-Insulating-Capacity-of-Polyurethane-Foams.pdf.jpg Improving-the-Insulating-Capacity-of-Polyurethane-Foams.pdf.jpg IM Thumbnail image/jpeg 3427 https://uvadoc.uva.es/bitstream/10324/61898/6/Improving-the-Insulating-Capacity-of-Polyurethane-Foams.pdf.jpg a9c046a043e6e500bb29aebe2c6d9b1e MD5 6 LICENSE license.txt license.txt text/plain 3929 https://uvadoc.uva.es/bitstream/10324/61898/5/license.txt 289d98c1665ee0d20312360f0e8643c8 MD5 5 CC-LICENSE license_rdf license_rdf application/rdf+xml; charset=utf-8 921 https://uvadoc.uva.es/bitstream/10324/61898/4/license_rdf 9eecc1514e7247cad41e4db756248760 MD5 4 ORIGINAL Improving-the-Insulating-Capacity-of-Polyurethane-Foams.pdf Improving-the-Insulating-Capacity-of-Polyurethane-Foams.pdf application/pdf 2423908 https://uvadoc.uva.es/bitstream/10324/61898/3/Improving-the-Insulating-Capacity-of-Polyurethane-Foams.pdf 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