@article{10272/12105,
year = {2014},
url = {http://hdl.handle.net/10272/12105},
abstract = {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.},
organization = {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
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(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).},
publisher = {Elsevier},
title = {Processing of bitumens modified by a bio-oil-derived polyurethane},
doi = {10.1016/j.fuel.2013.10.068},
author = {Cuadri Vega, Antonio Abad and García Morales, Moisés and Navarro Domínguez, Francisco Javier and Partal López, Pedro},
}