Mechanisms controlling the degradation of poly(methyl methacrylate) prior to piloted ignition

Dakka, Sam M.; Jackson, Gregory S.; Torero, José L.

doi:10.1016/s1540-7489(02)80038-4

Cited by 24 publications

(10 citation statements)

References 12 publications

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“…Under atmosphere air, the change of thermal behavior is a sign that the oxygen interacts directly with the solid phase of PPUF and accelerates the breakdown of Isocyanate and Polyol molecules at relatively low temperatures: Indeed, in Figure 3 we remark that the peaks of MLR takes place at lower temperature than under inert atmosphere. This result is in accordance with the results already obtained by Dakka et al (2002) concerning the thermal decomposition of another polymer, the PMMA.…”

Section: Thermogravimetric Results and Analysis Of The Decomposition supporting

confidence: 93%

Development of the Thermal Decomposition Mechanism of Polyether Polyurethane Foam Using Both Condensed and Gas-Phase Release Data

Rogaume

Valencia

Guillaume

et al. 2011

Combustion Science and Technology

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Section: Thermogravimetric Results and Analysis Of The Decomposition supporting

confidence: 93%

Development of the Thermal Decomposition Mechanism of Polyether Polyurethane Foam Using Both Condensed and Gas-Phase Release Data

Rogaume

Valencia

Guillaume

et al. 2011

Combustion Science and Technology

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“…Thus a reduction of the initial induction temperature is comparatively lower in the presence of air (from 280 o C in nitrogen to 250 o C in air). In addition, oxidation of any carbonaceous residue formed seems to be accelerated and is also found take place at a lower temperature in an oxidative atmosphere [12,13,25] However, the mechanisms under air are not entirely clear, and there are some disagreements between different authors [4,12,[15][16].…”

Section: Degradation Studies Of Black Pmma By Tga Measurement In Nitrmentioning

confidence: 99%

“…TGA/FTIR) did not yield full information regarding thermo-oxidative degradation of PMMA, especially, the role played by molecular oxygen. A genetic algorithm method [25] was effectively employed to predict the overall mass-loss rates during in any given experimental condition. The MLR evolution profiles, calculated by the decomposition model, showed a good agreement with experimental results.…”

Section: Main Conclusionmentioning

confidence: 99%

Experimental and modelling studies on the kinetics and mechanisms of thermal degradation of polymethyl methacrylate in nitrogen and air

Fateh

Richard

Rogaume

et al. 2016

Journal of Analytical and Applied Pyrolysis

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Highlights TGA and DSC were used to assess the decomposition and phase behaviour of PMMA.  Gas phase was analysed through FTIR.  Mechanism of the thermal decomposition of PMMA was proposed.  Kinetic parameters were calculated by employing a Genetic Algorithm.  Model was validated for different oxygen concentrations (10.5 and 15 vol.%). Abstract Modelling of spread of fires and their extinguishment in solid materials still present a significantchallenge. In order to reliably predict the behaviour of a material in a fire scenario, an adequate description of the processes occurring at the gas/solid interface is highly crucial. In this context,fire scenarios involving polymeric materials are of primary importance because of their increasing use as components in buildings and in transportation. The purpose of this study is to propose an accurate model for the thermal degradation of polymethyl methacrylate (PMMA) by primarily using thermogravimetric analysis (TGA). TGA in non-isothermal conditions, together with Fourier-transform infrared spectroscopy (FT-IR), was applied to investigate the thermal degradation of black PMMA in inert (nitrogen) and oxidizing (air) atmospheres, at different heating rates. The volatile degradation products as well as mass loss history provided sufficient information regarding the kinetics and possible degradation mechanisms of PMMA. A genetic algorithm (GA) was applied to estimate the kinetic parameters, which showed an excellent agreement with corresponding experimental observations for several heating rates and at different atmospheres (0, 10.5, 15 and 21vol. %O 2 ).

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“…Dakka et al [49] studied degradation of PMMA in both nitrogen and oxygenated atmospheres and conclude that mass transport limitations, which are indicated by evolved gas profiles, and oxygen transport into the material must be included in a proper analysis of piloted ignition.…”

Section: Moving Forwardmentioning

confidence: 99%

Flammability characteristics at applied heat flux levels up to 200 kW/m²

Beaulieu¹,

Dembsey

2007

Fire and Materials

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SUMMARYThis paper documents the first of the two interrelated studies that were conducted to more fundamentally understand the scalability of flame heat flux, the motivation being that it has been reported that flame heat flux back to the burning surface in bench-scale experiments is not the same as for large-scale fires. The key aspect was the use of real scale applied heat flux up to 200 kW/m 2 which is well beyond that typically considered in contemporary testing. The main conclusions are that decomposition kinetics needs to be included in the study of ignition and the energy balance for steady burning is too simplistic to represent the physics occurring.An unexpected non-linear trend is observed in the typical plotting methods currently used in fire protection engineering for ignition and mass loss flux data for several materials tested and this nonlinearity is a true material response. Using measured temperature profiles in the condensed phase shows that viewing ignition as an inert material process is inaccurate at predicting the surface temperature at higher heat fluxes. The steady burning temperature profiles appear to be invariant with applied heat flux. This possible inaccuracy was investigated by obtaining the heat of gasification via the 'typical technique' using the mass loss flux data and comparing it to the commonly considered 'fundamental' value obtained from differential scanning calorimetry measurements. This comparison suggests that the 'typical technique' energy balance is too simplified to represent the physics occurring for any range of applied heat flux. Observed bubbling and melting phenomena provide a possible direction of study.

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Mechanisms controlling the degradation of poly(methyl methacrylate) prior to piloted ignition

Cited by 24 publications

References 12 publications

Development of the Thermal Decomposition Mechanism of Polyether Polyurethane Foam Using Both Condensed and Gas-Phase Release Data

Development of the Thermal Decomposition Mechanism of Polyether Polyurethane Foam Using Both Condensed and Gas-Phase Release Data

Experimental and modelling studies on the kinetics and mechanisms of thermal degradation of polymethyl methacrylate in nitrogen and air

Flammability characteristics at applied heat flux levels up to 200 kW/m²

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Mechanisms controlling the degradation of poly(methyl methacrylate) prior to piloted ignition

Cited by 24 publications

References 12 publications

Development of the Thermal Decomposition Mechanism of Polyether Polyurethane Foam Using Both Condensed and Gas-Phase Release Data

Development of the Thermal Decomposition Mechanism of Polyether Polyurethane Foam Using Both Condensed and Gas-Phase Release Data

Experimental and modelling studies on the kinetics and mechanisms of thermal degradation of polymethyl methacrylate in nitrogen and air

Flammability characteristics at applied heat flux levels up to 200 kW/m2

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Product

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About

Flammability characteristics at applied heat flux levels up to 200 kW/m²