Determination of kinetic properties of polyurethane foam decomposition for pyrolysis modelling

Pau, Dennis; Fleischmann, Charles; Spearpoint, Michael; Li, Kai Y.

doi:10.1177/0734904113475858

Cited by 32 publications

(43 citation statements)

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“…Prasad et al [58] studied polyurethane foam formed out of a reaction between toluene diisocyanate (TDI)and a polyol. Pau et al [59] studied polyurethane foams made from the reaction of mainly toluene diisocyanate and polyalkoxy polyether polyol.…”

Section: Comparison Of Current Results With Published Onesmentioning

confidence: 99%

Kinetic modeling of polyurethane pyrolysis using non-isothermal thermogravimetric analysis

et al. 2015

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International audienceThe pyrolysis of polyurethane was studied by dynamic thermogravimetry analysis (TGA). Thestudied polyurethane is used as organic binder in casting process to make sand cores and molds. Asemi-empirical model is presented that can be used to describe polyurethane pyrolysis occurringduring TGA experiments. This model assumes that the polyurethane is pyrolysed by severalparallel independent reactions. The kinetic parameters of polyurethane pyrolysis were evaluatedby fitting the model to the experimental data obtained by TGA over a wide variety of heatingrates. A nonlinear least-squares optimization method is employed in the fitting procedure. Ahybrid objectives based simultaneously on the mass (TG) and mass loss rate (DTG) curves hasbeen used in the least-squares method. The values of the activation energy obtained by the nonlinearfitting were then recalculated by the methods of Kissinger and Friedmand. Furthermore,the parameters obtained in the present paper were then compared with those reported in theliterature

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Section: Comparison Of Current Results With Published Onesmentioning

confidence: 99%

Kinetic modeling of polyurethane pyrolysis using non-isothermal thermogravimetric analysis

et al. 2015

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“…The TG experiments have been conducted in nitrogen at four heating rates of 5, 20, 60, and 80 °C/min, with a purge flow rate of 100 mL/min. The decomposition in nitrogen may simulate the environment in flaming fires where oxygen is consumed before reaching the pyrolysis front [6]. Each MDF sample in TG experiment was subjected to two consequent runs: (1) dehydrating the sample under a peak temperature 130°C, and (2) after cooling down, linearly increasing the temperature range from 20 to 1000°C.…”

Section: Experimental Results and Analysismentioning

confidence: 99%

“…For well separated sub-reactions [6] it is not hard to determine the peak temperatures, however, for materials with strong overlapped sub-reactions such as wood [4], it is always a challenge to locate these peaks. Multiple peaks and shoulders are also observed for MDF DTG curves in Fig.…”

Section: Estimation Of Pyrolysis Stepsmentioning

confidence: 99%

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Pyrolysis of Medium-Density Fiberboard: Optimized Search for Kinetics Scheme and Parameters via a Genetic Algorithm Driven by Kissinger’s Method

et al. 2014

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The pyrolysis kinetics of charring materials plays an important role in understanding material combustions especially for constructions materials with complex degradation chemistry. Thermogravimetric analysis (TGA) is frequently used to study the heterogeneous kinetics of solid fuels, however, there is no agreed method to determine the pyrolysis scheme and kinetic parameters for charring polymers with multiple components and competing reaction pathways. This study develops a new technique to estimate the possible numbers of species and sub-reactions in pyrolysis by analysing the second derivatives of TG (DDTG) curves.The pyrolysis of a medium density fibreboard (MDF) in nitrogen is studied in detail, and the DDTG curves are used to locate the temperature of peak mass-loss rate for each sub-reactions. Then, based on the TG data under multiple heating rates, the Kissinger's method is used to quickly find the possible range of values of the kinetic parameters (A and E). These ranges are used to accelerate the optimization of the inverse problem using genetic algorithm (GA) for the kinetic and stoichiometric parameters. The proposed method and the kinetic scheme found are shown to match the experimental data and are able to predict accurately results at different heating rate better than the Kissinger's method. Moreover, the search method (K-K method) is highly efficient, faster than the regular GA search alone. Modelling results show that as the TG data available increases, the interdependence among kinetic parameters becomes weak and the accuracy of first-order model declines. Furthermore, conducting TG experiment under multiple heating rates is found to be crucial in obtaining good kinetic parameters.

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“…Polyurethane foams have been widely used in buildings as constructional and furnishing materials . Previous researches have demonstrated that the decomposition of polyurethane foam in a nitrogen environment proceeds via two pyrolysis sub‐reactions described as followed.…”

Section: Introductionmentioning

confidence: 99%

Pyrolysis of polyurethane foam: optimized search for kinetic properties via simultaneous K–K method, genetic algorithm and elemental analysis

Pau²,

Zhang

2015

Fire and Materials

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SUMMARYThis study focuses on the determination of kinetic properties for non-fire retardant (NFR) and fire retardant (FR) polyurethane foams. Based on the experimental thermogravimetric (TG) curves, this paper describes the application of an in-depth mathematical analysis and genetic algorithm (GA) to produce the kinetic properties. A recent developed technique, K-K method, is used for calculating kinetic properties and determining the search regions of these properties for GA. Elemental analysis is also used to study the pyrolysis mechanism. Three decomposition models were investigated for comparison, and the results show that the decomposition model with three sub-reactions achieves the closest representation with experimental results. In the model, two sub-reactions capture the foam and melt decompositions, and another sub-reaction with relatively lower activation energy captures the early onset of foam decomposition. The kinetic properties of melt decomposition are found similar because of the similarity of melt chemical formulas and decomposition of NFR and FR foams. The kinetic properties of foam decomposition between NFR and FR foams are different because of the mechanism of FR additives. Validation of the successive and parallel reaction schemes shows no noticeable difference between the two schemes in the modelling decomposition.

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Determination of kinetic properties of polyurethane foam decomposition for pyrolysis modelling

Cited by 32 publications

References 20 publications

Kinetic modeling of polyurethane pyrolysis using non-isothermal thermogravimetric analysis

Kinetic modeling of polyurethane pyrolysis using non-isothermal thermogravimetric analysis

Pyrolysis of Medium-Density Fiberboard: Optimized Search for Kinetics Scheme and Parameters via a Genetic Algorithm Driven by Kissinger’s Method

Pyrolysis of polyurethane foam: optimized search for kinetic properties via simultaneous K–K method, genetic algorithm and elemental analysis

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