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Influence of bitumen colloidal nature on the design of isocyanate-based bituminous products with enhanced rheological properties / Virginia Carrera in Industrial & engineering chemistry research, Vol. 48 N° 18 (Septembre 2009) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 48 N° 18 (Septembre 2009) . - pp. 8464–8470 Titre : Influence of bitumen colloidal nature on the design of isocyanate-based bituminous products with enhanced rheological properties Type de document : texte imprimé Auteurs : Virginia Carrera, Auteur ; Pedro Partal, Auteur ; Moises Garcia-Morales, Auteur Année de publication : 2010 Article en page(s) : pp. 8464–8470 Note générale : Chemical engineering Langues : Anglais (eng) Mots-clés : Bitumen  colloidal  nature  Rheological  propertiesIsocyanate-based  reactive  polymers Résumé : This work deals with the influence that bitumen colloidal nature exerts on the rheological properties of bitumen samples modified by isocyanate-based reactive polymers. Shear rheology tests, modulated differential scanning calorimetry (MDSC), chemical characterization by TLC-FID, and AFM microstructural analysis were carried out on four different 150/200 penetration neat bitumen samples and the corresponding MDI-PPG (a low molecular weight polypropylene glycol functionalized with a polymeric 4,4′-diphenylmethane diisocyanate) modified binders. The results obtained demonstrate that the bitumen modification degree depends on bitumen reactivity and microstructure. Thus, the highest modification capability is obtained with neat bitumen samples that exhibit both a well-developed three-dimensional network and a high chemical reactivity with the isocyanate groups. The results obtained may be used to improve the performance of these materials, according to their final application. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie9004404 [article] Influence of bitumen colloidal nature on the design of isocyanate-based bituminous products with enhanced rheological properties [texte imprimé] / Virginia Carrera, Auteur ; Pedro Partal, Auteur ; Moises Garcia-Morales, Auteur . - 2010 . - pp. 8464–8470. Chemical engineering Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 48 N° 18 (Septembre 2009) . - pp. 8464–8470 Mots-clés : Bitumen  colloidal  nature  Rheological  propertiesIsocyanate-based  reactive  polymers Résumé : This work deals with the influence that bitumen colloidal nature exerts on the rheological properties of bitumen samples modified by isocyanate-based reactive polymers. Shear rheology tests, modulated differential scanning calorimetry (MDSC), chemical characterization by TLC-FID, and AFM microstructural analysis were carried out on four different 150/200 penetration neat bitumen samples and the corresponding MDI-PPG (a low molecular weight polypropylene glycol functionalized with a polymeric 4,4′-diphenylmethane diisocyanate) modified binders. The results obtained demonstrate that the bitumen modification degree depends on bitumen reactivity and microstructure. Thus, the highest modification capability is obtained with neat bitumen samples that exhibit both a well-developed three-dimensional network and a high chemical reactivity with the isocyanate groups. The results obtained may be used to improve the performance of these materials, according to their final application. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie9004404

Role of water in the development of new isocyanate-based bituminous products / Maria J. Martín-Alfonso in Industrial & engineering chemistry research, Vol. 47 N°18 (Septembre 2008) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 47 N°18 (Septembre 2008) . - p. 6933–6940 Titre : Role of water in the development of new isocyanate-based bituminous products Type de document : texte imprimé Auteurs : Maria J. Martín-Alfonso, Auteur ; Pedro Partal, Auteur ; Francisco J. Navarro, Auteur Année de publication : 2008 Article en page(s) : p. 6933–6940 Note générale : Chemical engineering Langues : Anglais (eng) Mots-clés : Bituminous  membranes  MDI-PEG  reactive  polymer Résumé : Asphalt, roofing, and sealing markets strongly demand new materials for being used, for instance, as bituminous coating membranes. In that sense, this paper deals with the effect on these bitumen-based composites of the addition of a MDI-PEG reactive polymer, synthesized by the reaction of 4,4′-diphenylmethane diisocyanate with a low molecular weight poly(ethylene glycol). A short-term modification, taking place during mixing, and a long-term bitumen modification, which develops for a long period of curing (up to several months), have been identified. Both of them result from chemical reactions between NCO groups in the MDI-PEG and some of the bitumen compounds, mainly, the resin fraction. However, long-term bitumen modification seems to be related to the polymer−bitumen reactions but influenced by the environmental conditions (probably due to air moisture). This fact may be used to improve the manufacture of new materials with suitable properties according to their final application. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie800243w [article] Role of water in the development of new isocyanate-based bituminous products [texte imprimé] / Maria J. Martín-Alfonso, Auteur ; Pedro Partal, Auteur ; Francisco J. Navarro, Auteur . - 2008 . - p. 6933–6940. Chemical engineering Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 47 N°18 (Septembre 2008) . - p. 6933–6940 Mots-clés : Bituminous  membranes  MDI-PEG  reactive  polymer Résumé : Asphalt, roofing, and sealing markets strongly demand new materials for being used, for instance, as bituminous coating membranes. In that sense, this paper deals with the effect on these bitumen-based composites of the addition of a MDI-PEG reactive polymer, synthesized by the reaction of 4,4′-diphenylmethane diisocyanate with a low molecular weight poly(ethylene glycol). A short-term modification, taking place during mixing, and a long-term bitumen modification, which develops for a long period of curing (up to several months), have been identified. Both of them result from chemical reactions between NCO groups in the MDI-PEG and some of the bitumen compounds, mainly, the resin fraction. However, long-term bitumen modification seems to be related to the polymer−bitumen reactions but influenced by the environmental conditions (probably due to air moisture). This fact may be used to improve the manufacture of new materials with suitable properties according to their final application. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie800243w