Study of thermal degradation kinetics of high density polyethlyene (HDPE) by using TGA technique

Al-Bayaty, Subhi A.; Al-Uqaily, Raheem A.H.; Hameed, Sadik

doi:10.1063/5.0027503

Cited by 26 publications

(8 citation statements)

References 22 publications

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“…When the heating run is carried out under argon ( Figure 4 a), the material decomposition starts at around 225 °C and occurs according to an irregular trend with the temperature increase; a residue corresponding to about 10% of the initial sample weight is left after the thermal degradation. According to the literature, the thermal degradation of PE during TGA test occurs in a single step [ 29 , 30 ]. In the TGA curve of Figure 4 a, the stronger peak at 448 °C fits with thermal degradation of high-density polyethylene (HDPE) [ 29 ], while the degradation of low-density polyethylene (LDPE) is expected to be placed at about 475 °C [ 30 ].…”

Section: Resultsmentioning

confidence: 99%

“…According to the literature, the thermal degradation of PE during TGA test occurs in a single step [ 29 , 30 ]. In the TGA curve of Figure 4 a, the stronger peak at 448 °C fits with thermal degradation of high-density polyethylene (HDPE) [ 29 ], while the degradation of low-density polyethylene (LDPE) is expected to be placed at about 475 °C [ 30 ]. In addition, according to [ 31 ], the DTGA curve of recycled HDPE shows two peaks at 350 °C and 413 °C due to degradation of the material that occurred before recycling.…”

Section: Resultsmentioning

confidence: 99%

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Composition and Workability of Plastic Fractions Recovered from Commingled Waste Discarded by a Composting Plant

et al. 2023

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This paper deals with the recovery of plastic fractions from waste discarded by an industrial composting plant that processes the organic fraction of municipal solid waste. Polymeric fractions (PE, PP and PET) were sorted from this discarded waste using a NIR separator. The polymeric fractions were then washed to remove residual contaminants and characterized with the aim of assessing their composition. A process of pelletizing and injection molding suitable for producing specimens made of 100% of these recovered materials was set up. The tensile strength and stiffness, as well as the microstructure of the recycled plastics, were investigated. The mechanical features of samples fully made of recycled PE and PP were like those characteristic of virgin polymers. Samples made of PET did not show completely satisfactory properties, as they displayed rather poor elastic modulus and ductility.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Composition and Workability of Plastic Fractions Recovered from Commingled Waste Discarded by a Composting Plant

et al. 2023

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“…The preexponential coefficient n is experimentally observed to be 0.5 . The activation energy for the thermal degradation of PE is approximately 215–274 kJ/mol (51.4–65.5 kcal/mol). , Based on the proposed criteria, some parametric studies are performed. Note that the bond-breaking parameters are fine-tuned with an additional cook-off simulation using the ReaxFF, as described in Section .…”

Section: Simulation Methodsmentioning

confidence: 99%

Mesoscale Simulation of Polymer Pyrolysis by Coarse-Grained Molecular Dynamics: A Parametric Study

Nguyen

Jeon

Yang

et al. 2023

ACS Appl. Mater. Interfaces

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Full comprehension of the pyrolysis of polymer materials is crucial for the design and application of thermal protection systems; however, it involves complex phenomena at different spatial and temporal scales. To bridge the gap between the abundant atomistic simulations and continuum modeling in the literature, we perform a novel mesoscale study of the pyrolysis process using coarse-grained molecular dynamics (CG MD) simulations. Polyethylene (PE) consisting of united atoms including implicit hydrogen is considered a model polymer, and the configurational change of PE in thermal degradation is modeled by applying the bond-breaking phenomenon based on bond energy or bond length criteria. A cook-off simulation is implemented to optimize the heuristic protocol of bond dissociation by comparing the reaction products with a ReaxFF simulation. The aerobic hyperthermal pyrolysis under oxygen bombardment is simulated at a large scale of hundreds of nanometers to observe the intricate phenomena occurring from the surface to the depth inside the material. The intrinsic thermal durability of the model polymer at extreme conditions with and without oxygen environment can be effectively simulated from the proposed mesoscale simulation to predict important thermal degradation properties required for continuum-scale pyrolysis and ablation simulations. This work serves as an initial investigation of polymer pyrolysis at the mesoscale and helps understand the concept at a larger scale.

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“…Another study was conducted on predicting the service life of HDPE 100 pipes under thermal aging using comparisons of the mechanical behavior of this material in the presence/absence of antioxidants, the activation energy, and the shift factor by the oxidation index method ("OIT") (Eddine et al, 2000). Studies by researchers (Celina et al, 2005;Fouad, 2010 ;Al-Bayaty et al, 2020;Varley et al, 2000;Choi, E et al, 2020 ;Dorleans et al, 2021) report that the degradation of HDPE under temperature leads to a change in mechanical and physical behavior at temperatures between 40°C and 120°C, after these temperatures the results of the degradation of this material may be erroneous. The degradation of polymeric materials can focus on the variation of elongation at break, tensile strength, and density (Loos & Dara, 1987 ;Rühl et al, 2017 ;Kurtz et al, 2002).…”

Section: Introductionmentioning

confidence: 99%

Experimental study of the degradation of HDPE packaging under accelerated thermal aging

Elkori,

Lamarti,

Salmi

et al. 2024

10.5267/j.esm

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In this work, accelerated thermal aging at different temperatures was performed on high-density polyethylene (HDPE) bottles and specimens for food packaging. The degradation of HDPE was followed macroscopically by tensile and compression tests to evaluate the decrease in mechanical properties. The data obtained from these tests are used to calculate a new static damage law and the life fraction of this polymer. A prediction of the lifetime of HDPE was determined by thermogravimetric analysis (TGA) in dynamic mode. The evolution of the crystallinity rate during accelerated thermal aging was carried out using FOURIER transform infrared spectrometry (FTIR). The results obtained show a remarkable degradation of the mechanical properties in traction and compression by calculation of the static damage, and the physical and chemical properties by the analysis of the rate of crystallinity as well as the prediction by the law of Arrhenius.

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Study of thermal degradation kinetics of high density polyethlyene (HDPE) by using TGA technique

Cited by 26 publications

References 22 publications

Composition and Workability of Plastic Fractions Recovered from Commingled Waste Discarded by a Composting Plant

Composition and Workability of Plastic Fractions Recovered from Commingled Waste Discarded by a Composting Plant

Mesoscale Simulation of Polymer Pyrolysis by Coarse-Grained Molecular Dynamics: A Parametric Study

Experimental study of the degradation of HDPE packaging under accelerated thermal aging

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