Some polyester and polycarbonate-based waterborne polyurethanes (WPU) were characterised by means of several techniques, to correlate the morphology with their structures and properties. The morphological analysis carried out by transmission electron microscopy on thin sections showed that the selected polyurethanes, after purification, exhibit a nanostructured phase separation between hard and soft domains. The presence of hydrogen bonding and the hard/soft ratio were evaluated by FT IR and NMR spectroscopy. Both the thermal and the dynamic mechanical analysis allowed the polymers microstructure to be correlated with the polymer properties; two glass transition temperatures were determined, corresponding to the hard and soft domains respectively
On the Micro-Phase Separation in Waterborne Polyurethans / E., Princi; S., Vicini; K., Castro; D., Capitani; N., Proietti; Mannina, Luisa. - In: MACROMOLECULAR CHEMISTRY AND PHYSICS. - ISSN 1022-1352. - ELETTRONICO. - 210:(2009), pp. 879-889. [10.1002/macp.200900013]
On the Micro-Phase Separation in Waterborne Polyurethans
MANNINA, LUISA
2009
Abstract
Some polyester and polycarbonate-based waterborne polyurethanes (WPU) were characterised by means of several techniques, to correlate the morphology with their structures and properties. The morphological analysis carried out by transmission electron microscopy on thin sections showed that the selected polyurethanes, after purification, exhibit a nanostructured phase separation between hard and soft domains. The presence of hydrogen bonding and the hard/soft ratio were evaluated by FT IR and NMR spectroscopy. Both the thermal and the dynamic mechanical analysis allowed the polymers microstructure to be correlated with the polymer properties; two glass transition temperatures were determined, corresponding to the hard and soft domains respectivelyI documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
