RT info:eu-repo/semantics/article
T1 Rigid polyurethane foams with infused nanoclays: Relationship between cellular structure and thermal conductivity
A1 Estravís Sastre, Sergio
A1 Tirado Mediavilla, Josias
A1 Santiago Calvo, Mercerdes
A1 Ruiz Herrero, José Luis
A1 Villafañe González, Fernando
A1 Rodríguez Pérez, Miguel Ángel
AB A water blown rigid polyurethane (PU) formulation has been used to manufacture cellularnanocomposites containing different concentrations of montmorillonite nanoclays. The PUfoams have been produced using a low shear mixing technique for dispersing the nanoclaysand by reactive foaming to generate the cellular structure. A detailed characterizationof the cellular structure has been performed. The effect of the nanoparticles on thereaction kinetics and the state of intercalation of the nanoparticles in the foams has beenanalyzed. The thermal conductivity and extinction coefficient of the different materials hasbeen measured and the results obtained have been correlated with the materials structure.A strong reduction of cell size and modifications on cell size distribution, anisotropy ratioand fraction of material in the struts has been detected when the clays are added. In addition,a reduction of the thermal conductivity has been observed. Different theoretical modelshave been employed to explain thermal conductivity changes in terms of structuralfeatures. It has been found that, in addition to the modifications in the cellular structure,changes in the extinction coefficient and thermal conductivity of the matrix polymer playan important role on the final values of the thermal conductivity for these materials.
PB Elsevier
YR 2016
FD 2016
LK http://uvadoc.uva.es/handle/10324/25886
UL http://uvadoc.uva.es/handle/10324/25886
LA eng
NO European Polymer Journal 80 (2016) 1–15
NO Producción Científica
DS UVaDOC
RD 18-nov-2024