RT info:eu-repo/semantics/article
T1 Dynamic Mechanical Analysis during polyurethane foaming: Relationship between modulus build-up and reaction kinetics
A1 Cimavilla Román, Paula
A1 Santiago Calvo, Mercerdes
A1 Rodríguez Pérez, Miguel Ángel
K1 Dynamic mechanical analysis
K1 Análisis mecánico diferencial
K1 Rheokinetics
K1 Reocinética
K1 Polyurethane foams
K1 Poliuretano
K1 Chemical reactions
K1 Reacciones químicas
AB The modulus build-up and relative density evolution during the reactive foaming of four standard polyurethane formulations was monitored in-situ by Dynamic Mechanical Analysis (DMA) with a customised set-up in parallel plate geometry. The modulus increased from 0.01 MPa in the first minutes to over 1.2 MPa within 20 min. The set-up also enabled the recording of vitrification followed by curing times. These typically occur within 3 min of each other. The results of DMA are corroborated by measurements of the reaction kinetics with Infrared Spectroscopy. This goes to show that the modulus remains nearly unchanged during the stage of swiftest isocyanate conversion, while the point of gel conversion is accompanied by their increase.
PB Elsevier
SN 0142-9418
YR 2021
FD 2021
LK https://uvadoc.uva.es/handle/10324/48683
UL https://uvadoc.uva.es/handle/10324/48683
LA eng
NO Polymer Testing, 2021, In Press, 107336
NO Producción Científica
DS UVaDOC
RD 27-abr-2024