RT info:eu-repo/semantics/article
T1 Characterization and properties of water-blown rigid polyurethane foams reinforced with silane-modified nanosepiolites functionalized with graphite
A1 Santiago Calvo, Mercerdes
A1 Carracedo Pérez, María
A1 Puertas, María Luisa
A1 Esteban Cubillo, Antonio
A1 Santarén, Julio
A1 Villafañe González, Fernando
A1 Rodríguez Pérez, Miguel Ángel
K1 Flame retardant
K1 Polymers
K1 Poliuretans
K1 Polyurethane foam
K1 Espumas poliméricas de poliuretano - Propiedades mecánicas
K1 Thermal stability
K1 Graphite
K1 Grafito
K1 Condensed Matter Physics
K1 Física de la materia condensada
K1 Materials science
K1 2304.21 Poliuretanos
K1 2206.10 Polímeros
K1 3312 Tecnología de Materiales
AB In the present study, a promising flame retardant consisting of 80 wt% silane-modified nanosepiolites functionalized with 20 wt% graphite (SFG) is used to obtain a synergistic effect principally focussed on the thermal stability of water-blown rigid polyurethane (RPU) foams. Density, microcellular structure, thermal stability and thermal conductivity are examined for RPU foams reinforced with different contents of SFG (0, as reference material, 2, 4 and 6 wt%). The sample with 6 wt% SFG presents a slightly thermal stability improvement, although its cellular structure is deteriorated in comparison with the reference material. Furthermore, the influence of SFG particles on chemical reactions during the foaming process is studied by FTIR spectroscopy. The information obtained from the chemical reactions and from isocyanate consumption is used to optimize the formulation of the foam with 6 wt% SFG. Additionally, in order to determine the effects of functionalization on SFG, foams containing only silane-modified nanosepiolites, only graphite, or silane-modified nanosepiolites and graphite added separately are studied here as well. In conclusion, the inclusion of SFG in RPU foams allows the best performance to be achieved.
PB MDPI
SN 1996-1944
YR 2022
FD 2022
LK https://uvadoc.uva.es/handle/10324/62854
UL https://uvadoc.uva.es/handle/10324/62854
LA eng
NO Materials, 2022, Vol. 15, Nº. 1, 381
NO Producción Científica
DS UVaDOC
RD 23-may-2024