Kinetic Analysis of Thermal Degradation of Polyolefin Mixtures

Murichan, N.; Cherntongchai, Parimanan

doi:10.7763/ijcea.2014.v5.372

Cited by 4 publications

(5 citation statements)

References 13 publications

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“…The degradation for HDPE and PP shows that PP degrades at lower temperatures than HDPE. This is likely to be due to the inherent branching in the PP carbon chain, which allows the easier formation of tertiary carbon radicals, that promote the degradation of the polymer chain 13 . Both of the polymers seem to degrade in a single process, as it can be seen that the degradation of the materials occurs in a relatively limited temperature range and is consistent with the fact that the DTG curve presents a single degradation peak.…”

Section: Resultsmentioning

confidence: 56%

“…The Coats‐Redfern equation uses an integration of the Arrhenius equation, using an integral form of the reaction model, and allows the estimation of the activation energy. Different reaction models can be tested, and the model that has the best linear fit is chosen 11–18 . Model‐free methods rely on plots, based on the degradation temperature for different heating rates.…”

Section: Introductionmentioning

confidence: 99%

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Kinetic analysis of the degradation of HDPE+PP polymer mixtures

Briceno

Lemos

2021

Int J of Chemical Kinetics

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An in depth understanding of the kinetics of the decomposition of plastic mixtures is necessary to enhance chemical recycling approaches, in particular by pyrolysis. The fact that plastic waste is usually composed of mixtures of plastics constitutes a hindrance for secondary recycling but may not be a particular difficulty for tertiary recycling. In this study, an analysis of the thermal degradation of mixtures of high‐density polyethylene (HDPE) and polypropylene (PP), in different proportions, was carried‐out under pyrolysis conditions using thermogravimetric analysis (TGA) under nonisothermal conditions, at different heating rates. Both isoconversional and model‐fitting approaches were used to estimate kinetic parameters from the experimental information. It was found that both the degradation of HDPE and PP, as well as their mixtures, can be described by a single‐step degradation process but that the degradation process is influenced by the proportion between the two plastics. The HDPE/PP mixtures in which PP has a higher ratio than HDPE cause the degradation onset temperature for the mixture to be lower than either pure PP or pure HDPE. Also, it was found that the apparent activation energy estimated was lower for these mixtures in comparison with the pure polymers. This implies that there are extensive interactions between the plastics during the degradation procedure and, from an operational point of view, it may be actually easier to degrade plastic mixtures than the corresponding pure streams, a conclusion that is important in the context of tertiary recycling of plastic mixtures. Furthermore, it was observed that a compensation effect exists that encompasses all the kinetic data for the mixtures, regardless of the composition, indicating that, although significant changes occur in relation to the activation energy, the underlying degradation mechanism remains the same.

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Section: Resultsmentioning

confidence: 56%

Section: Introductionmentioning

confidence: 99%

Kinetic analysis of the degradation of HDPE+PP polymer mixtures

Briceno

Lemos

2021

Int J of Chemical Kinetics

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“…As a result, the degree of polymerization of the chains decreases continuously without the formation of ethylene monomers, which is accompanied by a continuous decrease in weight. [ 20 ] Figure 3 represents the results of TGA and DTGA measurements of PE alloy and various 1‐octene grafted PE samples. It is clear from Figure 3a that the thermal degradation of PE alloy occurred at temperature range of 400–510 °C.…”

Section: Resultsmentioning

confidence: 99%

Mechanical, Rheological, and Heat Seal Properties of 1‐Octene Grafted Low Density Polyethylene Films

Salmani,

Shemshadi,

Moghaddampour

et al. 2024

Macro Reaction Engineering

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Heat seal and mechanical properties of 1‐octene grafted low density polyethylene (LDPE) films containing various concentrations of Dicumyl peroxide as the initiator and 1‐octene grafting agent was investigated through using experimental measurements. Attenuated total reflection Fourier transform infrared spectroscopy (ATR‐FTIR) of 1‐octene grafted low density polyethylene films indicated the achievement of grafting process. The results of differential scanning calorimeter (DSC) measurements revealed that the melting temperature shifts to higher values and the peak of the DSC curve becomes wider with the increase of 1‐octene concentrations. Thermogravimetric analysis (TGA) revealed a higher thermal stability up to 20°C for 1‐octene grafted PE compared with neat polyethylene alloy containing low density polyethylene (LDPE) and linear low density polyethylene (LLDPE). The results of stress‐strain measurements revealed that the 1‐octene grafted PE alloys has higher tensile strength in comparison with neat PE alloy and samples containing only DCP initiator. The results of heat seal analysis indicated that both DCP initiator and 1‐octene tended to offer a moderate increase peel strength of PE alloy. Dynamic mechanical thermal analysis (DMTA) measurements for various grafted PE alloys show a higher damping factor in comparison with neat LDPE alloy. Rheological measurements indicated a higher storage modulus up to 25% and higher complex viscosity for grafted PE samples containing 1‐octene comonomer.This article is protected by copyright. All rights reserved

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“…%). The operation of the TGA was non-isothermal as the sample was heated at four different heating rates and the weight losses with respect to temperatures were recorded [10]. This analysis is important to identify the thermal stability of the material as this will indicate how easily the material will degrade under the influence of high temperatures.…”

Section: Methodsmentioning

confidence: 99%

The fundamental studies on the reaction kinetics of thermal decomposition of bio-composite based backsheet materials in photovoltaic (PV) panel

Zulkeply

Pang

Vaithilingam

et al. 2022

J. Phys.: Conf. Ser.

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This research presents the reaction kinetics of thermal decomposition of vetiver filled Polylactic Acid (PLA) bio-composite based backsheet in Photovoltaic (PV) panel via the Thermogravimetric Analysis (TGA) and Differential Scanning Calorimetry (DSC). The conventional PV backsheet called TEDLAR (Polyvinyl Fluoride, PVF) is made from petroleum, a non-biodegradable material which will impose serious problems to the environment at the end-of-life of the PV modules. Therefore, it is important to identify the suitability of PLA/vetiver to replace TEDLAR. The best composition of PLA/vetiver producing the lowest thermal degradation is discussed by analysing the activation energy of the bio-composites with different weight percent (wt. %) of PLA/vetiver. The result showed the wt. % of PLA/vetiver with lower content of the natural fibre has a lower thermal degradation temperature which indicates the rapid start of the degradation process. However, TEDLAR degrades at an average temperature of 400°C proving the ability to withstand extreme temperatures, thus it does not degrade easily. The results showed the higher the content of the vetiver, the lower the degradation temperature. The activation energy of the bio-composites was calculated using the Kissinger method and the estimation values of the different doses of PLA/vetiver range between 28 to 77 kJ/mol.

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Kinetic Analysis of Thermal Degradation of Polyolefin Mixtures

Cited by 4 publications

References 13 publications

Kinetic analysis of the degradation of HDPE+PP polymer mixtures

Kinetic analysis of the degradation of HDPE+PP polymer mixtures

Mechanical, Rheological, and Heat Seal Properties of 1‐Octene Grafted Low Density Polyethylene Films

The fundamental studies on the reaction kinetics of thermal decomposition of bio-composite based backsheet materials in photovoltaic (PV) panel

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