Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Use of thermoplastic polyurethanes as carbonisation agents in intumescent blends. Part 3: Modification of the dynamic properties of polypropylene/thermoplastic polyurethane/ammonium polyphosphate formulations with heat and stress
(Continued from 17 (1999), 494-513). Previous studies have shown the fire retardancy performance and the improved thermal behaviour of polypropylene-based materials when a TPU/APP (thermoplastic polyurethane/ammonium polyphosphate) system is melt blended with the PP (polypropylene) matrix. Considered is the evaluation of the dynamic properties of a typical PP/TPU/APP material. The experiments, carried out using a rheometer as a thermal reactor, allow a correlation between fire and thermal behaviour of the material with the change of its high temperature dynamic properties. The LOI can be correlated with the viscosity values of the materials. The expansion of PP/TPU/APP fire retarded materials, under a normal force is considered. The different steps of intumescent formation and degradation can be well evaluated with the measurement of viscosity. The evolution of elastic and viscous modulus allows comparisons between physical structure of the intumescent shield and its efficiency under heating. The intumescence formation leads to a severe increase of the viscosity values of the formulation and implies changes of its viscoelastic behaviour.
Use of thermoplastic polyurethanes as carbonisation agents in intumescent blends. Part 3: Modification of the dynamic properties of polypropylene/thermoplastic polyurethane/ammonium polyphosphate formulations with heat and stress
(Continued from 17 (1999), 494-513). Previous studies have shown the fire retardancy performance and the improved thermal behaviour of polypropylene-based materials when a TPU/APP (thermoplastic polyurethane/ammonium polyphosphate) system is melt blended with the PP (polypropylene) matrix. Considered is the evaluation of the dynamic properties of a typical PP/TPU/APP material. The experiments, carried out using a rheometer as a thermal reactor, allow a correlation between fire and thermal behaviour of the material with the change of its high temperature dynamic properties. The LOI can be correlated with the viscosity values of the materials. The expansion of PP/TPU/APP fire retarded materials, under a normal force is considered. The different steps of intumescent formation and degradation can be well evaluated with the measurement of viscosity. The evolution of elastic and viscous modulus allows comparisons between physical structure of the intumescent shield and its efficiency under heating. The intumescence formation leads to a severe increase of the viscosity values of the formulation and implies changes of its viscoelastic behaviour.
Use of thermoplastic polyurethanes as carbonisation agents in intumescent blends. Part 3: Modification of the dynamic properties of polypropylene/thermoplastic polyurethane/ammonium polyphosphate formulations with heat and stress
Verwendung thermoplastischer Polyurethane als Carbonisierungsmittel in aufgasenden Mischungen. Teil 3: Modifizierung der dynamischen Eigenschaften von Formulierungen aus Polypropylen/thermoplastischem Polyurethan/Ammoniumpolyphosphat bei Hitze und Belastung
Bugajny, M. (Autor:in) / Bras, M. Le (Autor:in) / Noel, A. (Autor:in) / Bourbigot, S. (Autor:in)
Journal of Fire Sciences ; 18 ; 104-129
2000
16 Seiten, 17 Bilder, 1 Tabelle, 13 Quellen
Aufsatz (Zeitschrift)
Englisch