Effects of MDI–PPG molecular weight on the thermorheological behaviour of MDI–isocyanate based bituminous foams

Izquierdo, M.A.G.; Navarro, Francisco; Martínez‐Boza, F.J.; Gallegos, C.

doi:10.1016/j.jiec.2012.10.025

Cited by 16 publications

(3 citation statements)

References 30 publications

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“…exert on the rheological properties of asphaltic bitumen modified with isocyanate prepolymers. On the other hand, Izquierdo et al [13][14][15] studied the application of isocyanate prepolymers in the fabrication of stable bituminous foams, and highlighted the influence of bitumen hardness and prepolymer molecular weight.…”

Section: Introductionmentioning

confidence: 99%

Influence of the prepolymer molecular weight and free isocyanate content on the rheology of polyurethane modified bitumens

Carrera¹,

Cuadri²,

García‐Morales³

et al. 2014

European Polymer Journal

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Isocyanate-based modification is lately gaining acceptance as a successful way to give added value to bitumen, a crude oil refining by-product. In order to study the influence of prepolymer type on the rheological properties of the resulting binders, six prepolymers synthesized from polypropylene-glycols (PPG) with varying molecular weight (between 440 and 2425) and different molar excess of a polymeric MDI (4,4'-diphenylmethane diisocyanate) were used. Two modification procedures, either involving or not water addition were followed. The modification achieved depends on both the selected polyol molecular weight and the excess in MDI (i.e., free isocyanate content), although not in a similar extent. Viscous flow and dynamic oscillatory shear tests, at 60 ºC, demonstrated a much higher level of bitumen modification by using the prepolymer prepared with the polyol having a molecular weight of 940 and with a free isocyanate content of 17.4 wt.%, mainly after addition of water. On the other hand, bitumen nature greatly affects the final rheological properties of these bituminous products. In that sense, modification results much more effective when conducted on bitumen with a well-developed colloidal microstructure.

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Section: Introductionmentioning

confidence: 99%

Influence of the prepolymer molecular weight and free isocyanate content on the rheology of polyurethane modified bitumens

Carrera¹,

Cuadri²,

García‐Morales³

et al. 2014

European Polymer Journal

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“…Indeed, the combination of MDI and PTMG has been used as a commercial TPU . In addition, the combination of MDI and HDI as hard segments and PBA, PCL, and PPG as soft segments also has potential application prospects in various fields. − …”

Section: Computational Detailsmentioning

confidence: 99%

Shock Hugoniot Calculations of Newly Designed Thermoplastic Elastomers and Comparison with Classical Binder Estane

Zhou,

Li,

Cao

et al. 2024

J. Phys. Chem. B

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Our purpose is to design excellent binder candidates used in polymer-bonded explosives (PBX) according to the calculated shock of Hugoniot. Here, we mainly examined the thermoplastic elastomer (TPE) binders commonly used in PBX formulations. Equilibrium molecular dynamics (MD) simulation and mixing rule methods were used to calculate the shock Hugoniot values of 180 newly designed TPEs. We focused on the influence of the polymerization degree, contents, and types of soft and hard segments composed of TPEs on the shock Hugoniot and compared them with the classic PBX binder, Estane. The results show that the hard segment has an effect on the Hugoniot curve, which gradually diminishes as the degree of polymerization increases. The underlying physical mechanism can be attributed to the presence of a large number of hydrogen bonds in hard segment domains. The shock Hugoniot of TPEs also depends on the type of soft segments. The volume compression rate of TPEs decreases with increasing content of hard segments under a given shock. By comparing with Estane, a TPE binder commonly used in PBX, we ultimately chose several new TPEs with the potential to serve as PBX binders in terms of shock performance.

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“…The results of this study indicated a very good resistance of the asphalt binder in a permanent rutting deformation. In synthesized polyurethane (MDI-PPG 1 ), while the complex shear modulus (G*) increased, the phase angle (δ) was reduced (Izquierdo et al., 2013, 2014). Elsewhere, the synthesized polyurethane was compared with styrene-butadiene styrene (SBS).…”

Section: Introductionmentioning

confidence: 99%

Linking fatigue response of asphalt binders, mastics, and asphalt concrete mixture modified by nano-silica and synthesized polyurethane

Motamedi

Shafabakhsh

Azadi

2020

International Journal of Damage Mechanics

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Asphalt concrete is composed of stone, sand, filler, and asphalt binder. Fatigue can be considered as a phenomenon affecting both the binder (asphalt binder or mastic) and the mixture. The purpose of this study was to investigate the fatigue damage response in asphalt binders, mastics, and asphalt concrete mixtures modified with nano-silica and synthesized polyurethane. The continuum damage mechanics method and phenomenological approaches in this study were used to investigate the fatigue performance. Obtained results indicated that the effect of the synthesized polyurethane on improving the fatigue life was far greater than that of nano-silica. The damage process in asphalt binders differed from that in the mastic and asphalt concrete mixture. Damage intensity parameter is an appropriate criterion for evaluating fatigue performance of asphalt binders and mastics. Concerning the fatigue of asphalt concrete mixture, the results of this study indicated a better convergence between the fatigue parameters of mastics and asphalt concrete mixture compared to asphalt binders, especially with increasing aging. Also, there was greater convergence between the fatigue life of the asphalt concrete mixture and asphalt binder and mastics in the method of continuum damage mechanics as compared to the phenomenological approach.

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Effects of MDI–PPG molecular weight on the thermorheological behaviour of MDI–isocyanate based bituminous foams

Cited by 16 publications

References 30 publications

Influence of the prepolymer molecular weight and free isocyanate content on the rheology of polyurethane modified bitumens

Influence of the prepolymer molecular weight and free isocyanate content on the rheology of polyurethane modified bitumens

Shock Hugoniot Calculations of Newly Designed Thermoplastic Elastomers and Comparison with Classical Binder Estane

Linking fatigue response of asphalt binders, mastics, and asphalt concrete mixture modified by nano-silica and synthesized polyurethane

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