RT info:eu-repo/semantics/article
T1 A new synthesis route to produce isocyanate-free polyurethane foams
A1 Amezúa Arranz, Clara
A1 Santiago Calvo, Mercerdes
A1 Rodríguez Pérez, Miguel Ángel
K1 Higiene industrial
K1 Materials science
K1 Free-isocyanate polyurethane foams
K1 Sodium bicarbonate
K1 Formulation optimization
K1 Espumas de poliuretano sin isocianatos
K1 Bicarbonato de sodio
K1 Optimización de la formulación
K1 2211.02 Materiales Compuestos
AB Isocyanate is a toxic substance that is one of the main reactants used in the conventional fabrication route for polyurethane foams. This study presents the synthesis of isocyanate-free polyurethane foams from cyclic carbonates and diamines using sodium bicarbonate as the foaming agent. Three different series of foams are synthesised using three types of sodium bicarbonates having different average particle sizes (i.e. 3, 13, and 22 µm) at four content levels (i.e. 5, 10, 15, and 20 wt% with respect to cyclic carbonate). The density, open-cell content, average cell size, normalised standard deviation of the cell size distribution, anisotropy, cell density and cell nucleation density are characterized for all the materials synthesized. In addition, a theoretical study of the expected densities is conducted to compare the theoretical values with the experimental densities obtained for the foams. Finally, the foams previously manufactured with high sodium-bicarbonate content are optimised by modifying the catalyst content from 0.5 to 2.0 wt% with respect to cyclic carbonate, thereby producing foams with lower densities. Nonisocyanate polyurethane foams having densities as low as 142 kg/m3 are fabricated.
PB Elsevier
SN 0014-3057
YR 2023
FD 2023
LK https://uvadoc.uva.es/handle/10324/61273
UL https://uvadoc.uva.es/handle/10324/61273
LA eng
NO European Polymer Journal, 2023, vol. 197, 112366
NO Producción Científica
DS UVaDOC
RD 21-may-2024