Thermal degradation kinetics of polystyrene/cadmium sulfide composites

Kuljanin-Jakovljević, J.; Marinović‐Cincović, Milena; Stojanović, Ž.; Krklješ, A.; Abazović, Nadica D.; Čomor, Mirjana I.

doi:10.1016/j.polymdegradstab.2009.03.004

Cited by 41 publications

(14 citation statements)

References 27 publications

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“…53 At the same time, the dehydration of phosphorus containing compounds to a certain extent inhibits the transesterication of polylactic acid and improves the thermal stability of the polymer. 54 With the rising of thermal degradation temperature, the thermal degradation rate of the two materials increased slowly. While the thermal degradation rate increased rapidly, when the thermal degradation temperature reached 700 K (about 427 degrees).…”

Section: Determination Of Ame Retardancymentioning

confidence: 99%

Understanding thermal decomposition kinetics of flame-retardant thermoset polylactic acid

Qiang

Xie

et al. 2019

RSC Adv.

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The Flynn-Wall-Ozawa method was applied to study the local activation energy of flame retardant thermoset PLA, and the results showed that with an increase of conversion of thermal degradation, the local activation energy was increased slowly. When the conversion of thermal degradation was under 15%, the activation energy of flame retardant thermoset PLA was lower than that of thermoset PLA, attributed to the low bond energy of P-C bond. When the conversion of thermal degradation exceeded 15%, the dehydration charcoal effect of phosphorous compound slowed down the process of thermal degradation, and the activation energy of flame retardant thermoset PLA was higher than that of thermoset PLA, indicating that the addition of 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide (DOPO) enhances the thermal stability of thermoset PLA. The Coats-Redfern method and invariant kinetic parameters method were used to understand kinetics details about this process including the activation energy and apparent pre-exponential factor, and estimated contribution ratios for the 18 kinetic functions. The results showed that the addition of DOPO didn't impact the most important mechanism of thermal degradation but changed the contribution ratios of the 18 kinetic functions.According to the functional relationship between decomposition rate with temperature and quality conversion rate, three-dimension surface plots were made to understand the change regulation of decomposition rate. We found that the addition of DOPO reduced the decomposition rate of thermoset PLA, attributing to the dehydration charcoal effect of phosphorous compound which restrained the interesterification of PLA, and thus enhancing the thermal stability of thermoset PLA.

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Section: Determination Of Ame Retardancymentioning

confidence: 99%

Understanding thermal decomposition kinetics of flame-retardant thermoset polylactic acid

Qiang

Xie

et al. 2019

RSC Adv.

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“…15,16 Then the protection factor (PF) as a common parameter of measuring the anti-aging efficiency of compounds can be calculated from the OIT value via the non-Arrhenius temperature function. 22 Among lots of models which can be used to study the crosslinking network of rubber, tube model which takes the topological restriction and entanglement of molecular chains into consideration is one of the most practical models. 19,20 Thermal analysis kinetics can be used to acquire the degradation activation energy of material via the reaction dynamic equations, such as Kissinger-Akahira-Sunose (KAS) equation and Friedman equation.…”

Section: Introductionmentioning

confidence: 99%

Effect of nanosilica-based immobile antioxidant on thermal oxidative degradation of SBR

et al. 2015

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A new kind of nanosilica-based immobile antioxidant (RT-silica) consisting of nanosilica, antioxidant intermediate p-aminodiphenylamine (RT) and silane coupling agent 3-glycidoxypropyltrimethoxysilane (KH-560) was successfully synthesized via a grafting reaction in our laboratory. It was revealed that the anti-oxidation performance of the SBR/RT-silica composite was far superior to that of the SBR/silica composite, especially at high temperature, based on the results of non-isothermal oxidation induction time (OIT) tests. The calculation of protection factors (PFs) based on two non-Arrhenius temperature functions showed that silica possessed an acceleration effect on the aging of the SBR matrix. According to the results of tensile tests, the SBR/RT-silica composites exhibited more preeminent mechanical properties and residual rates during accelerated aging, in comparison with the SBR/silica composites. The affections of RT-silica on the cross-linking network of the SBR matrix were investigated via a tube model, demonstrating that RT-silica can't change the cross-linking density, but can induce the chain entanglement of rubber molecular chains. Moreover, the calculated values of degradation activation energy of SBR composites via the Kissinger-Akahira-Sunose (KAS) method and Friedman method showed that RT-silica changed the thermal-oxidative aging mechanism of the SBR matrix.

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“…A combustão destes gases gera chamas e elevação da temperatura, no qual atinge valores entre 350 °C a 500 °C, podendo chegar a temperatura de 900 °C a 1000 °C. Após o consumo do material orgânico pela combustão, ocorre o decaimento e extinção da chama [3] .…”

Section: Introductionunclassified

Comportamento térmico de compósitos PS-HDL (Mg-Al) modificados com DBS e SDS

et al. 2015

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ResumoHoje em dia é crescente a quantidade de estudos envolvendo a utilização de cargas ou aditivos nos materiais poliméricos, em especial no poliestireno, a fim de atuar como retardante de chama. Partindo desse princípio, este trabalho compara o comportamento térmico dos compósitos de poliestireno/hidróxido duplo lamelar magnésio-alumínio (PS-HDL [Mg-Al]) em relação ao poliestireno puro. Os compostos foram preparados com HDL, quimicamente modificado com dodecil sulfato de sódio (SDS-Na) ou com dodecilbenzeno sulfonato de sódio (DBS-Na). A síntese desses aditivos (HDL-SDS e HDL-DBS) foi feita pelo método de coprecipitação e inseridos no PS via solubilização em clorofórmio. Os compostos foram caracterizados por difratometria de raios-X e espectroscopia de infravermelho por transformada de Fourier, onde o primeiro comprovou a intercalação do DBS/SDS com o HDL e o segundo confirmou a presença dos grupos característicos no HDL. Através da análise termogravimétrica, avaliaram-se as propriedades térmicas do compósito. Os resultados mostraram que o PS-HDL modificado comporta-se melhor que o PS puro, pois apresenta maior estabilidade térmica. Comparando-os em uma perda de massa de 50%, o PS-HDL-SDS apresentou resultado superior ao PS puro, com um ganho de aproximadamente 44 ºC na temperatura de decomposição térmica. Palavras-chave: comportamento térmico, poliestireno, hidróxido duplo lamelar, modificação química. AbstractNowadays there is an increasing number of studies involving the use of fillers or additives for polymeric materials, in particular polystyrene, as flame retardants. Starting from this principle, this paper compares the thermal performance of composites of polystyrene/double layered magnesium-aluminium hydroxide (PS-LDH [Mg-Al]) compared to pure polystyrene. Compounds were prepared with LDH, chemically modified with sodium dodecyl sulphate (SDS-Na) or sodium dodecylbenzene sulfonate (SDB-Na). The synthesis of these additives (SDS-LDH and SDB-LDH) was carried out by the coprecipitation method and inserted via the PS dissolution in chloroform. The compounds were characterized by X-ray diffraction and Fourier transform infrared spectroscopy, where the first method proved the intercalation of the SBD/SDS with LDH and the second confirms the presence of the characteristic groups in LDH. Thermal properties of the composite were evaluated by thermo gravimetric analysis. The results showed that the modified PS-LDH behaves better than pure PS, it has higher thermal stability. Comparing them in a mass loss of 50%, the PS-LDH-SDS showed better results compared to pure PS, with a gain of approximately 44 ºC in the thermal decomposition temperature.

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Thermal degradation kinetics of polystyrene/cadmium sulfide composites

Cited by 41 publications

References 27 publications

Understanding thermal decomposition kinetics of flame-retardant thermoset polylactic acid

Understanding thermal decomposition kinetics of flame-retardant thermoset polylactic acid

Effect of nanosilica-based immobile antioxidant on thermal oxidative degradation of SBR

Comportamento térmico de compósitos PS-HDL (Mg-Al) modificados com DBS e SDS

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