Model-free method for isothermal and non-isothermal decomposition kinetics analysis of PET sample

Saha, Biswajit; Maiti, A. K.; Ghoshal, Aloke Kumar

doi:10.1016/j.tca.2006.02.018

Cited by 103 publications

(48 citation statements)

References 29 publications

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“…For Coats and Redfern approximation, the temperature integral term can be calculated using (13) [5].…”

Section: E Dt I E Rtmentioning

confidence: 99%

“…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%

“…Saha et al [5] studied the isothermal and the non-isothermal degradation kinetics of PET waste using various temperature integral approximation approaches such as Coats and Redfern, Gorbachev, and Agrawal and Sivasubramanian and the direct numerical integration to analyze the decomposition kinetics. The results showed that the activation energy was a weak but increasing function with the conversion in case of the non-isothermal condition but was a decreasing function with the conversion in case of the isothermal condition.…”

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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“…For Coats and Redfern approximation, the temperature integral term can be calculated using (13) [5].…”

Section: E Dt I E Rtmentioning

confidence: 99%

Section: Introductionsmentioning

confidence: 99%

Section: Introductionsmentioning

confidence: 99%

Section: Introductionsmentioning

confidence: 99%

See 2 more Smart Citations

Kinetic Analysis of Thermal Degradation of Polyolefin Mixtures

Murichan¹,

Cherntongchai²

2014

IJCEA

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show abstract

“…The polymers in the blends, miscible or immiscible, have more alternative ways to dissipate the energy accumulated in the materials with heating process when compared to the pure polymers, such as the increase of the interfacial area and diffusion of chains among the phases. Alternatives pathways for the dissipation of the energy increase the thermal stability of polymers because these ways [29,30] .…”

Section: Integrating Up To Conversion Equation 3 Gives (Equation 4)mentioning

confidence: 99%

Miscibility influence in the thermal stability and kinetic parameters of poly (3-hydroxybutyrate)/poly (ethylene terephthalate) sulphonated blends

Silva¹,

Carvalho²,

Muniz³

et al. 2010

Polímeros

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Abstract:The thermal degradation of miscible and immiscible poly (3-hidroxy butyrate) PHB/ poly (ethylene terephthalate) sulphonated (PETs) blends was investigated using thermogravimetric analyses. Model-free kinetic analysis, Vyazovkin and Flynn-Wall-Ozawa's methods, were used to determine the apparent activation energy in the whole interval of degradation of the pure polymers, immiscible blends, and miscible blends. The thermal stability of both polymers in their blends is higher when compared to the pure polymers. The synergistic effect in the thermal stability in the blends is higher for the miscible blend where the formation of the specific interaction between PHB and PETs occurs. The apparent activation energy of the individual polymers is higher in PETs/PHB blends, and this effect is potentiated by the miscibility of the blend.

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Formal Kinetic Parameters – Problems and Solutions in Deriving Proper Values

Phusunti

Hornung

2014

Transformation of Biomass

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Model-free method for isothermal and non-isothermal decomposition kinetics analysis of PET sample

Cited by 103 publications

References 29 publications

Kinetic Analysis of Thermal Degradation of Polyolefin Mixtures

Kinetic Analysis of Thermal Degradation of Polyolefin Mixtures

Miscibility influence in the thermal stability and kinetic parameters of poly (3-hydroxybutyrate)/poly (ethylene terephthalate) sulphonated blends

Formal Kinetic Parameters – Problems and Solutions in Deriving Proper Values

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