Pyrolytic decomposition and model-free kinetics analysis of mixture of polypropylene (PP) and low-density polyethylene (LDPE)

Chowlu, Aie Cheng King; Reddy, P. Karthik; Ghoshal, Aloke Kumar

doi:10.1016/j.tca.2008.12.004

Cited by 45 publications

(35 citation statements)

References 38 publications

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“…Then, these free radicals destabilized the more stable polymer (LDPE), resulting in the lower activation energy of the polyolefin mixture. And, the same explanation was also addressed by Chowlu et al [11].…”

Section: Kinetic Parameters Analysis For Thermal Degradation Of Posupporting

confidence: 59%

“…And, the operation can be operated in both isothermal [3]- [5] and non-isothermal [5]- [11]. For the isothermal operation, sample temperature is initially increased rapidly from room temperature to a specific temperature and maintained at that temperature for an entire degradation process.…”

Section: Introductionsmentioning

confidence: 99%

“…Considering the non-isothermal model-free method, there are different types of the temperature integral numerical approximation approaches for example Ozawa, Flynn and Wall (OFW) method using a linear approximation (less accurate) utilizing Doyle's approximation [9] and Vyazovkin (VYZ) method using a non-linear approximation (more accurate) [3] utilizing a direct numerical integration method [11], Cai et al approximation [5], Coats & Redfern approximation, Gorbachev approximation or Agrawal and Sivasubramanian approximation [6]. Between OFW method and VYZ method, VYZ model-free method has become popular because it can bring out the more reliable and consistent kinetic information from the non-isothermal TG data of the polymer degradation [11].…”

Section: Introductionsmentioning

confidence: 99%

“…Between OFW method and VYZ method, VYZ model-free method has become popular because it can bring out the more reliable and consistent kinetic information from the non-isothermal TG data of the polymer degradation [11]. And, this method was applied in this work.…”

Section: Introductionsmentioning

confidence: 99%

“…In addition, they found that Cai et al approximation approach was the best method among other approximation approaches. Chowlu et al [11] studied the non-isothermal degradation of PP and LDPE mixtures of different ratios (20:80, 35:65, 50:50, 65:35, 80:20) using the direct numerical integration for the temperature integral approximation. They reported that, the activation energy weakly increased with the conversion during the initial degradation stage but, then, became strongly increased with increased the conversion at the later stage until the end of the degradation process.…”

Section: Introductionsmentioning

confidence: 99%

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Kinetic Analysis of Thermal Degradation of Polyolefin Mixtures

Murichan¹,

Cherntongchai²

2014

IJCEA

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Abstract-Plastic wastes are a global concern for their environmental impacts. A proficiency method for plastic waste management is a chemical recycling through a pyrolysis process. In this work, kinetic analysis of thermal degradation of polyolefin mixture between polypropylene (PP) and low density polyethylene (LDPE) under pyrolysis atmosphere at different compositions was investigated using thermogravimetric analysis (TGA), operated non-isothermally. Besides, Vyazovkin model-free method, together with different temperature integral approximation approaches, was used for kinetic parameter analysis from TGA results. It was found that thermal degradation process of polyolefin mixture was a triple step process and an addition of PP reduced degradation temperature. Besides, different approximation approaches did not affect activation energy value. For polyolefin mixture, the activation energy was increased initially, constant intermediately and finally increased again with increasing conversion. Finally, the activation energy of the polyolefin mixture was lower than those of pure polymers and decreased with increasing PP fraction.

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Section: Kinetic Parameters Analysis For Thermal Degradation Of Posupporting

confidence: 59%

Section: Introductionsmentioning

confidence: 99%

Section: Introductionsmentioning

confidence: 99%

Section: Introductionsmentioning

confidence: 99%

Section: Introductionsmentioning

confidence: 99%

See 3 more Smart Citations

Kinetic Analysis of Thermal Degradation of Polyolefin Mixtures

Murichan¹,

Cherntongchai²

2014

IJCEA

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Effect of the melt flow index and melt flow rate on the thermal degradation kinetics of commercial polyolefins

Abbas-Abadi

Nekoomanesh‐Haghighi

Yeganeh

2012

J of Applied Polymer Sci

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In this study, several polyolefins, including different grades of polypropylene (PP), high-density polyethylene, linear low-density polyethylene, and low-density polyethylene, were tested by thermogravimetric analysis (TGA), and the relationships of their melt flow index (MFI) and melt flow ratio (MFR) values to the thermogravimetry (TG) curves, differential thermogravimetry (DTG) curves, and activation energy of thermal degradation were investigated. Kinetic evaluations were performed by Friedman and Kissinger analysis methods, and the apparent activation energy values for the overall degradation of different grades of polyethylenes (PEs) and PPs were determined. We found that for the samples with lower MFIs, the thermograms shifted to higher temperatures. Meanwhile, a higher activation energy was needed for their thermal degradation. Also, for samples with higher values of MFR, as a means of molecular weight distribution, a lower activation energy was needed for their thermal degradation, and their TGA thermograms shifted to lower temperatures. The breadth of the DTG curves depended on the MFR in the PEs, although MFR had little effect on the DTG curves in the studied PP grades. Among all of the samples studied, the injection-molding grades with medium MFIs and low MFRs degraded at higher temperatures and showed better thermal stability.

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