RT Journal Article
T1 Processing of bitumens modified by a bio-oil-derived polyurethane
A1 Cuadri Vega, Antonio Abad
A1 García Morales, Moisés
A1 Navarro Domínguez, Francisco Javier
A1 Partal López, Pedro
AB Castor oil (CO) functionalized by isocyanate groups (–NCO) is proposed as a novel bio-based reactive polyurethane (PU) for bitumen modification. This work presents a comparative analysis conducted on blends of bitumen and 2 wt.% of a PU prepolymer prepared by NCO-functionalization of castor oil. Four preparation procedures were evaluated, which resulted from the combination of two processing times (1h or 24h, at 90ºC) followed by two different post-treatments (water addition or ambient curing for up to 6 months). It was found that the degree of modification attained after post-treatment depends on the previous processing conditions. Thus, short processing times are required if the binder is further subjected to ambient curing. Instead, the success of the water-addition modification falls on a previous long processing step. As revealed by rheological tests, ambient curing was seen to be by far a more efficient way of modification if compared to direct addition of water, and makes clear that the resulting binder evolves towards a better performance when in service. In that sense, Thin Layer Chromatography tests, Modulated DSC and AFM images demonstrated a more complex microstructure characterized by the presence of a larger content of molecules with higher polarity, size and molecular weight.
PB Elsevier
SN 0016-2361
SN 1873-7153 (electrónico)
YR 2014
FD 2014
LK http://hdl.handle.net/10272/12105
UL http://hdl.handle.net/10272/12105
LA eng
NO Cuadri Vega, A.A., García Morales, M., Navarro Domínguez, F.J., Partal López, P.: "Processing of bitumens modified by a bio-oil-derived polyurethane". Fuel. Vol. 118, págs. 83-90, (2014). DOI: 10.1016/j.fuel.2013.10.068
NO This work is part of two research projects sponsored by a MEC-FEDER Programme (Research Project MAT2007-61460) and by a Junta de Andalucia Programme- 19 -(TEP6689). The authors gratefully acknowledge their financial support. A.A. Cuadri also thanks “Ministerio de Educación” for the concession of a F.P.U. research grant (AP2008-01419).
DS Repositorio Institucional de la Universidad de Huelva
RD 31 may 2026