Study of the thermooxidative degradation kinetics of poly(tetrafluoroethene) using iso-conversional calculation procedure

Genieva, Svetlana; Vlaev, L. T.; Atanassov, Atanas

doi:10.1007/s10973-009-0191-4

Cited by 83 publications

(42 citation statements)

References 41 publications

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“…Generally, the kinetic equation and the reaction rate of the chemical reactions can be written as follows [9,23,27,28]:…”

Section: Theoretical Approach and Mathematical Backgroundmentioning

confidence: 99%

“…If the studies are carried out under a linear increase of the temperature dT/dt = q = const, Equation (1) may be rewritten as follows [23,27,28]:…”

Section: Theoretical Approach and Mathematical Backgroundmentioning

confidence: 99%

“…After substitution of (4) in (3), separation of the variables, and integration, the following general equation is obtained [23,28,29]:…”

Section: Theoretical Approach and Mathematical Backgroundmentioning

confidence: 99%

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Kinetics of Nonisothermal Degradation of Some Polymer Composites: Change of Entropy at the Formation of the Activated Complex from the Reagents

Turmanova

Genieva

Vlaev

2011

Journal of Thermodynamics

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Studying the nonisothermal kinetics of degradation of rice husks in air or nitrogen atmosphere, polypropylene and tetrafluoroethylene-ethylene copolymer filled with different quantities of rice husks flour or the products of its thermal degradation, namely "white" or "black" rice husks ash, a linear dependence was observed between the ln A and E A , known as the kinetic compensation effect or theta rule. A linear relationship was also established between E A and the change of the entropy ΔS / = for the formation of the activated complex from the reagents. These dependences are related to the assumption of identical kinetic mechanisms of thermal degradation of the composites studied. The negative values of ΔS / = obtained show that the activated complex is a "more organized" structure than the initial reactants and that these reactions may be classified as "slow" ones. It may be concluded that the products of the thermal degradation of rice husks in a fluidized bed reactor can successfully replace the more expensive synthetic fillers to obtain different polymer composites. These polymer composites can lead to the futuristic "organic-inorganic hybrid materials" with specific properties.

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“…Generally, the kinetic equation and the reaction rate of the chemical reactions can be written as follows [9,23,27,28]:…”

Section: Theoretical Approach and Mathematical Backgroundmentioning

confidence: 99%

“…If the studies are carried out under a linear increase of the temperature dT/dt = q = const, Equation (1) may be rewritten as follows [23,27,28]:…”

Section: Theoretical Approach and Mathematical Backgroundmentioning

confidence: 99%

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Kinetics of Nonisothermal Degradation of Some Polymer Composites: Change of Entropy at the Formation of the Activated Complex from the Reagents

Turmanova

Genieva

Vlaev

2011

Journal of Thermodynamics

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“…An empty alumina crucible was used as reference. The Coats and Redfern's integral method (Genieva et al 2010) was applied for the mathematical analysis of the thermo-degradation kinetic parameters of the NCs based on the TG/DTG data (Yang et al 2010). This method is defined by the Arrhenius equation (Eq.…”

Section: Thermo-stability Analysismentioning

confidence: 99%

“…The apparent activation energies (Ea) of the main degradation stage of the studied systems were determined using the Coats and Redfern method (Genieva et al 2010). The Arrhenius plot of ln[-ln(1-α)/T 2 ] and 1/T gave a straight line (Fig.…”

Section: Thermal Stability and Degradation Evaluation Thermo-gravimetmentioning

confidence: 99%

Degradable Nursery Containers Made of Rice Husk and Cornstarch Composites

et al. 2016

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The degradation behavior was investigated for eco-composite nursery containers (NCs) prepared with rice husk and cornstarch adhesive modified with urea formaldehyde (UF) as a wet strength agent. The wet shear strength, water absorption capacities, and biological degradation of NCs within soil were also investigated. Quantitative analysis of the thermal degradation behavior of different NC versions was performed by thermo-gravimetric analysis (TGA). The results demonstrated that the introduction of the UF agent accelerated the soil degradation of the NCs matrix to a certain extent. The maximum cumulative mass loss was 51.1% when the UF content of NCs was 8 wt.%. Moreover, the dry strength of the mixed urea formaldehyde-cornstarch adhesive (UCA) was increased by 108.9% compared with cornstarch adhesive (CA). The results of this work indicate the improved biodegradability of the NC ecocomposites, which could make them potential sustainable alternatives for conventional plastic pots.

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