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24 results on '"Torró-Palau, Ana M."'

20. Effect of Amount of Functionalised Carbon Nanofibres in Polyurethane Dispersions.

Author

Orgilés-Calpena, Elena, Arán-Aís, Francisca, Torró-Palau, Ana M., and Orgilés-Barceló, César

Subjects
CARBON nanofibers, POLYURETHANES, ADHESIVES, DISPERSION (Chemistry), SUSPENSIONS (Chemistry), DEFORMATIONS (Mechanics), VISCOELASTICITY
Abstract

Waterborne polyurethane (WBPU) adhesives reinforced with carbon nanofibres (CNFs) were prepared, and their properties were evaluated as a function of content (0.1-1 wt%). The incorporation of carbon nanofibres into waterborne polyurethane adhesives presents great difficulty because of their tendency to form aggregates, which prevents an efficient dispersion. It is therefore necessary to introduce functional groups on the surface of the nanofibres to improve their interaction with any polymer. In this research, carbon nanofibres were preoxidised by chemical functionalisation to enhance their stability in waterborne polyurethane adhesives. The results showed that the chemical treatment used to functionalise the carbon nanofillers and the experimental procedure employed to incorporate them into the polyurethane were adequate, as stable dispersions were obtained. Moreover, the addition of nanofibres to the waterborne polyurethanes improved their rheological and viscoelastic properties, resulting in an increase in viscosity and causing changes in the crystallisation kinetics. [ABSTRACT FROM AUTHOR]

Published
2012
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23. Effect of Amount of Functionalised Carbon Nanofibres in Polyurethane Dispersions*

Author

Orgil?s-Calpena, Elena, Arán-Aís, Francisca, Torró-Palau, Ana M., and Orgil?s-Barceló, C?sar

Abstract

Waterborne polyurethane (WBPU) adhesives reinforced with carbon nanofibres (CNFs) were prepared, and their properties were evaluated as a function of content (0.1–1 wt%). The incorporation of carbon nanofibres into waterborne polyurethane adhesives presents great difficulty because of their tendency to form aggregates, which prevents an efficient dispersion. It is therefore necessary to introduce functional groups on the surface of the nanofibres to improve their interaction with any polymer. In this research, carbon nanofibres were preoxidised by chemical functionalisation to enhance their stability in waterborne polyurethane adhesives. The results showed that the chemical treatment used to functionalise the carbon nanofillers and the experimental procedure employed to incorporate them into the polyurethane were adequate, as stable dispersions were obtained. Moreover, the addition of nanofibres to the waterborne polyurethanes improved their rheological and viscoelastic properties, resulting in an increase in viscosity and causing changes in the crystallisation kinetics.

Published
2012
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24. CONDUCTIVE POLYURETHANE ADHESIVES BASED ON CARBON NANOTUBES.

Author

ORGILÉS-CALPENA, ELENA, ARÁN-AÍS, FRANCISCA, TORRÓ-PALAU, ANA M., and ORGILÉS-BARCELÓ, CÉSAR

Subjects
*CARBON nanotubes, *POLYURETHANES, *ADHESIVES
Abstract

Carbon nanotubes are considered as ideal reinforcement fillers for polymers and adhesives due to their unique structure and properties. In this research, waterborne polyurethene adhesives (WBPU) reinforced with carbon nanotubes (CNTs) were prepared and their properties were evaluated as a function of content (0.1-1 wt%). The obtained results showed that the addition of carbon nanotubes to polyurethane dispersions contributed to improve their rheological, viscoelastic, thermal and mechanical properties and even impart some electrical conductive character to adhesives. [ABSTRACT FROM AUTHOR]

Published
2013

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