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RISS 인기검색어
- 검색키워드
- 저자 : F.J. Martınez-Boza (검색결과 2 건)
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F.J. Navarro,P. Partal,M. Garcıa-Morales,M.J. Martı´n-Alfonso,F. Martınez-Boza,C. Gallegos,J.C.M. Bordado,A.C. Diogo 한국공업화학회 2009 Journal of Industrial and Engineering Chemistry Vol.15 No.4
The main goal of this research was to compare the modification capability of two different types of bitumen modifiers: non-reactive plastomers and elastomers, and reactive polymers. The group of nonreactive polymers included a block copolymer (SBS), recycled thermoplastic polymers (EVA/LDPE blends), and crumb tire rubber, which were mixed at a processing temperature of 180 8C. In the second group, a reactive MDI–PEG prepolymer, a low processing temperature modifier (90 8C), was considered. The study was mainly focused on the characterization of the thermorheological behaviour of selected modified bitumen samples. In addition, the thermal behaviour (bymodulated DSC), andmorphology (by optical microscopy) of these modified bitumen samples were also evaluated. All of these bitumen modifiers significantly improve the thermomechanical properties of the resulting binder, especially at high in-service temperatures. However, whereas bitumen modified by non-reactive polymers undergo marked oxidation events due to the high processing temperature used (180℃), MDI–PEG modified bitumen does not experience this phenomenon because of the lower processing temperature involved (90℃). In general, non-reactive polymers should be added in much larger concentrations than the reactive polymer to obtain similar results, although the latter requires a further period of curing, at room temperature, to induce suitable modification. Finally, only MDI–PEG modified bitumen is stable when stored at high temperature (163℃), whereas all the non-reactive polymer-modified bitumen studied undergo either phase separation or particle precipitation.
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M.A. Izquierdo,F.J. Navarro,F.J. Martınez-Boza,C. Gallegos 한국공업화학회 2013 Journal of Industrial and Engineering Chemistry Vol.19 No.2
Dimensionally stable bituminous foams were prepared by using 4,40-diphenylmethane diisocyanate/polypropylene glycol (MDI–PPG) quasi-prepolymers, with different molecular weights. From the results obtained, it may be concluded that, after foam formation, the rheological properties are remarkably affected, especially at high temperatures. Paradoxically, the greater the molecular weight of MDI–PPG,the lower the values of viscosities at 60 8C, and the linear viscoelasticity functions of the resulting foams. This result seems to be related to the improved ability of small MDI–PPG molecules to interact strongly with polar bitumen compounds, leading to the formation of larger molecular-sized compounds.
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