Mechanisms and kinetics studies on the thermal decomposition of micron Poly (methyl methacrylate) and polystyrene

Cheng, Jie; Pan, Yong; Yao, Jun; Wang, Xiaoping; Pan, Fei; Jiang, Juncheng

doi:10.1016/j.jlp.2015.12.017

Cited by 42 publications

(15 citation statements)

References 30 publications

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“…Coats-Redfern (CR) Cheng et al (2016) 40-600 Nitrogen 105-148 2.9 × 10 7 -1.5 × 10 10 CR Present work 40-600 Nitrogen 99-140 1.2 × 10 8 -2.3 × 10 11 OFW Present work 40-600 Nitrogen 103-149 3.4 × 10 9 -2.6 × 10 12 KAS Present work 40-600 Nitrogen 99-141 4.5 × 10 9 -1.3 × 10 12 Friedman Present work Figure 9. Plots for calculation of thermodynamics parameters for waste polystyrene degradation.…”

Section: Discussionmentioning

confidence: 99%

“…Several kinetic models were applied to thermo-catalytic decomposition of waste expanded polystyrene for investigation of kinetic parameters. The resultant kinetic parameters were compared with each other and with the literature as shown in Table 6 ( Blanco et al, 2011;Cheng et al, 2016;Kim et al, 2003Kim et al, , 2010Lisa et al, 2003;Risby et al, 1982;Sato and Kaneko, 1983;Sato et al, 1990;Şenocak et al, 2016;Sørum et al, 2001;Westerhout et al, 1997a;Zeng et al, 2007). Table 6 shows comparison of kinetic parameters determined using various models at different temperature ranges.…”

Section: Comparison Of Calculated Kinetics Parameters With Literaturementioning

confidence: 99%

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Thermo-catalytic decomposition of polystyrene waste: Comparative analysis using different kinetic models

et al. 2019

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Due to a huge increase in polymer production, a tremendous increase in municipal solid waste is observed. Every year the existing landfills for disposal of waste polymers decrease and the effective recycling techniques for waste polymers are getting more and more important. In this work pyrolysis of waste polystyrene was performed in the presence of a laboratory synthesized copper oxide. The samples were pyrolyzed at different heating rates that is, 5°Cmin−1, 10°Cmin−1, 15°Cmin−1 and 20°Cmin−1 in a thermogravimetric analyzer in inert atmosphere using nitrogen. Thermogravimetric data were interpreted using various model fitting (Coats–Redfern) and model free methods (Ozawa–Flynn–Wall, Kissinger–Akahira–Sunose and Friedman). Thermodynamic parameters for the reaction were also determined. The activation energy calculated applying Coats–Redfern, Ozawa–Flynn–Wall, Kissinger–Akahira–Sunose and Friedman models were found in the ranges 105–148.48 kJmol−1, 99.41–140.52 kJmol−1, 103.67–149.15 kJmol−1 and 99.93–141.25 kJmol−1, respectively. The lowest activation energy for polystyrene degradation in the presence of copper oxide indicates the suitability of catalyst for the decomposition reaction to take place at lower temperature. Moreover, the obtained kinetics and thermodynamic parameters would be very helpful in determining the reaction mechanism of the solid waste in a real system.

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Section: Discussionmentioning

confidence: 99%

Section: Comparison Of Calculated Kinetics Parameters With Literaturementioning

confidence: 99%

Thermo-catalytic decomposition of polystyrene waste: Comparative analysis using different kinetic models

et al. 2019

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“…Activation energy is an important parameter in the understanding of the thermal stability of materials. The apparent activation energy ( E a ) represents the difference between the average energy of the activated molecule and the average energy of all molecules, which can reflect the stability of material …”

Section: Resultsmentioning

confidence: 99%

Thermal degradation and aging behavior of polytriazole polyethylene oxide‐tetrahydrofuran elastomer based on click‐chemistry

Xiao

et al. 2020

J of Applied Polymer Sci

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Polytriazole polyethylene oxide‐tetrahydrofuran (PTPET) elastomer was prepared based on the click‐chemistry reaction between the CCH and N3 groups. The PTPET exhibits improved thermal stability with an activation energy of 204 kJ/mol compared with hydroxyl‐terminated polyethylene oxide‐tetrahydrofuran (PET) elastomer. TG‐FTIR and pyrolysis‐gas chromatography–mass spectrometry (Py‐GC–MS) were used to analyze the pyrolysis mechanism and products of the PTPET elastomer. The pyrolytic mechanism of PTPET mainly involves breakage of the polyether chains. The main pyrolytic products were identified. The PTPET underwent for 180 days at 50°C and 60°C. The tensile properties, dynamic mechanical analysis (DMA) and TGA of the aged PTPET were investigated. The tensile stress and strain of the aged PTPET increased until 120 days (at 60°C) or 150 days (at 50°C), which could be attributed to the postcuring of the elastomer. The scission of the PTPET chains due to aging could dominate after aging for 120 days (at 60°C) or for 150 days (at 50°C), resulting in the reduction of mechanical properties.

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“…The model which has the best linearity with experimental profile is considered as the real reaction model. There are nineteen commonly used reaction models in a kinetics area [5,6]. Each model will be used to fit the experimental formation with the obtainment of activation energy and pre-exponential factor.…”

Section: Traditional Kinetic Methodsmentioning

confidence: 99%

“…Cheng et al compared the thermal degradation behaviors of micron polymethyl methacrylate (PMMA) and polystyrene (PS) by a traditional kinetics method. They found that the particle size diameters can result in the decrease of activation energies, but have no obvious influence on pre-exponential factors [6]. Other researchers have conducted related studies about particle size effects on material pyrolysis behavior.…”

Section: Literature Reviewmentioning

confidence: 99%

Pyrolytic Kinetics of Polystyrene Particle in Nitrogen Atmosphere: Particle Size Effects and Application of Distributed Activation Energy Method

et al. 2020

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This work was motivated by a study of particle size effects on pyrolysis kinetics and models of polystyrene particle. Micro-size polystyrene particles with four different diameters, 5, 10, 15, and 50 µm, were selected as experimental materials. Activation energies were obtained by isoconversional methods, and pyrolysis model of each particle size and heating rate was examined through different reaction models by the Coats–Redfern method. To identify the controlling model, the Avrami–Eroféev model was identified as the controlling pyrolysis model for polystyrene pyrolysis. Accommodation function effect was employed to modify the Avrami–Eroféev model. The model was then modified to f(α) = nα0.39n − 1.15(1 − α)[−ln(1 − α)]1 − 1/n, by which the polystyrene pyrolysis with different particle sizes can be well explained. It was found that the reaction model cannot be influenced by particle geometric dimension. The reaction rate can be changed because the specific surface area will decrease with particle diameter. To separate each step reaction and identify their distributions to kinetics, distributed activation energy method was introduced to calculate the weight factor and kinetic triplets. Results showed that particle size has big impacts on both first and second step reactions. Smaller size particle can accelerate the process of pyrolysis reaction. Finally, sensitivity analysis was brought to check the sensitivity and weight of each parameter in the model.

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Mechanisms and kinetics studies on the thermal decomposition of micron Poly (methyl methacrylate) and polystyrene

Cited by 42 publications

References 30 publications

Thermo-catalytic decomposition of polystyrene waste: Comparative analysis using different kinetic models

Thermo-catalytic decomposition of polystyrene waste: Comparative analysis using different kinetic models

Thermal degradation and aging behavior of polytriazole polyethylene oxide‐tetrahydrofuran elastomer based on click‐chemistry

Pyrolytic Kinetics of Polystyrene Particle in Nitrogen Atmosphere: Particle Size Effects and Application of Distributed Activation Energy Method

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