Thermal analysis kinetics applied to flame retardant polycarbonate

Polli, H.; Pontes, Luiz Antônio Magalhães; Souza, M. J. B.; Fernandes, Valter J.; Araújo, Antônio S.

doi:10.1007/s10973-005-7289-0

Cited by 30 publications

(5 citation statements)

References 6 publications

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“…The effective activation energy is calculated directly from TGA curves, and KAS method was chosen because it is applicable to a wide interval of activation energies. 23 –28 Analysis of the resulting dependence provides important clues about changes in reaction mechanism. 29 The overall rate of the polymer degradation is commonly described by equation (1), where it is assumed that the activation energy is constant for a certain value of conversion ( α ).…”

Section: Resultsmentioning

confidence: 99%

Thermal decomposition of fire-retarded high-impact polystyrene and high-impact polystyrene/ethylene–vinyl acetate blend nanocomposites followed by thermal analysis

Katančić

Travaš-Sejdić

Hrnjak-Murgić

et al. 2012

Journal of Elastomers & Plastics

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Blend nanocomposites of high-impact polystyrene and ethylene–vinyl acetate at a ratio of 3:1, with the addition of aluminum hydroxide Al(OH)3 and diphenyl 2-ethylhexyl phosphate (DPO) as fire retardants (FRs) and silica (SiO2) nanofiller were prepared by extrusion. Thermal decomposition, mechanism and kinetics of degradation of the studied samples were characterized by thermogravimetric analysis (TGA) and differential scanning calorimetry (DSC). The fire-retarded samples were characterized by following the degradation kinetics obtained from TGA data by recording the samples at four different heating rates. That enables us to determine one of the kinetic parameters, activation energy (E a) of thermal decomposition. The effect of high concentration of FRs on morphology and properties of the studied samples were analyzed by scanning electron microscopy and mechanical properties. The obtained results show that the FRs delay thermal decomposition, particularly in combination with SiO2 nanofiller, which significantly contributes to slowing down the degradation process.

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Section: Resultsmentioning

confidence: 99%

Thermal decomposition of fire-retarded high-impact polystyrene and high-impact polystyrene/ethylene–vinyl acetate blend nanocomposites followed by thermal analysis

Katančić

Travaš-Sejdić

Hrnjak-Murgić

et al. 2012

Journal of Elastomers & Plastics

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“…The activation energy of pure PC was calculated to be 135 kJ/mol. In comparison, an activation energy of 165 kJ/mol reported by Polli et al using the Vyazovkin model and the free kinetics method 29. As seen from Table II, addition of Pd nanoclusters into the polymer matrix reduced the k 0 values for the in situ as well as the ex situ nanocomposites.…”

Section: Resultsmentioning

confidence: 78%

Studies on the thermal stability and degradation kinetics of Pd/PC nanocomposites

Onbattuvelli

Rochefort

Simonsen

et al. 2010

J of Applied Polymer Sci

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Effect of heating rate, Pd content, and synthesis method on the thermal stability of the ex situ and in situ Palladium/polycarbonate (Pd/PC) nanocomposites was investigated. TEM images revealed discrete Pd nanoclusters of about 5 and 15 nm sizes for 1 and 2 vol % ex situ nanocomposites, respectively. However, agglomerated Pd nanoclusters were noticed in the in situ samples, irrespective of the Pd content. The ex situ Pd/PC nanocomposites showed high onset temperature (Ti) for thermal degradation of PC than the in situ and pure PC samples. Pd content and heating rates were found to have a positive influence on the Ti and Tm (temperature at the maximum degradation rate occurs) of the Pd/PC nanocomposites. Thermal degradation of the PC was found to follow the first-order kinetics in the Pd/PC nanocomposites. The activation energies associated with the degradation were determined by using the Kissinger method. These activation energies are used to construct the Master decomposition curve (MDC) and weight-time-temperature (a-t-T) plots that describe the time-temperature dependence of the PC pyrolysis in the Pd/ PC nanocomposites. These constructed a-t-T plots were validated with the data from isothermal measurements.

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“…Although PC is decomposed mainly through hydrolysis/alcoholysis of carbonate and the rupture of isopropylidene both in air and in N 2 (Fig. 10), PC decomposed through the rearrangement of carbonate in N 2 , while PC begins its thermal decomposition through the oxidation of isopropylidene and hydroxyl radicals (HO•) and alcoxyl radicals (RO•) were formed in air [25,26] .…”

Section: Thermal Stabilitymentioning

confidence: 99%

Thermal stability and fire safety of polycarbonate flame retarded by the brominated flame retardant and a non-antimony synergistic agent

Wang¹,

Ye²,

Guo³

et al. 2023

Preprint

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Aiming at developing a non-antimony synergistic agent of BFR and improving the high heat and smoke release of BFR due to its gaseous phase flame retardant mechanism, CeHPP was synthesized through hydrothermal reflux method and introduced into PC/DBDPO through melt blending. The morphology, chemical structure and thermal stability of CeHPP were characterized through SEM, FTIT and TG analysis, while the flame retardancy of PC/DBDPO/Sb2O3 and PC/DBDPO/CeHPP composites were compared and discussed in detail. To our delight, CeHPP showed more excellent synergistic effect with DBDPO than Sb2O3 in PC matrix. For PC/DBDPO/CeHPP (92/7/1, wt%), the sample was not ignited, the value of limited oxygen index (LOI) went up to 39.2% and it reached UL 94 V0 rating in vertical burning test, while the Izod impact strength, elongation at break and Young’s modulus were almost kept same with those of pure PC. Moreover, according to the cone calorimetry, CeHPP and DBDPO/CeHPP could efficiently suppress the heat and smoke release of PC composites, while DBDPO and DBDPO/Sb2O3 would accelerate the heat and smoke release during combustion The synergistic flame retardant mechanism verified that the char-barrier effect of CeHPP transferred the free-radical-trapping effect of BFRs from the gaseous phase to the condensed phase, which interfered the chain oxidation reaction of free-radicals and inhibiting the release and spread of gases and smoke.

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Thermal analysis kinetics applied to flame retardant polycarbonate

Cited by 30 publications

References 6 publications

Thermal decomposition of fire-retarded high-impact polystyrene and high-impact polystyrene/ethylene–vinyl acetate blend nanocomposites followed by thermal analysis

Thermal decomposition of fire-retarded high-impact polystyrene and high-impact polystyrene/ethylene–vinyl acetate blend nanocomposites followed by thermal analysis

Studies on the thermal stability and degradation kinetics of Pd/PC nanocomposites

Thermal stability and fire safety of polycarbonate flame retarded by the brominated flame retardant and a non-antimony synergistic agent

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