Application of model-free kinetics to the thermal and thermo-oxidative degradation of poly(3-hexyl thiophene)

Ramani, R.; Srivastava, Jaya; Alam, Sarfaraz

doi:10.1016/j.tca.2009.10.019

Cited by 26 publications

(12 citation statements)

References 38 publications

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“…, there is one endothermic base line shift and one endothermic peak in the DSC thermograms of PTh and its nanocomposites. The endothermic peak at about 200°C is generally attributed to the thermal decomposition reaction while the curve appears an endothermic shift at about 125°C is assigned to the glass transition temperature ( T g ) of the polymer matrix . Meguaded et al determined T g of pure PTh as 170°C, while it is calculated as 122.80°C in this study.…”

Section: Resultsmentioning

confidence: 60%

PTh/Co₃O₄ nanocomposites as new conducting materials for micro/nano‐sized electronic devices

Özkazanç

2017

Polymer Engineering & Sci

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This paper reports polythiophene/cobalt (II,III) oxide (PTh/Co3O4) nanocomposites synthesized via in situ polymerization of thiophene in the presence of Co3O4 at various molar concentrations. Samples were characterized by Fourier transform infrared spectroscopy (FT‐IR), X‐ray diffraction (XRD), Energy‐dispersive X‐ray (EDX) spectroscopy, differential scanning calorimetry (DSC), thermogravimetric analysis (TGA) and atomic force microscopy (AFM). The alternating current (ac) conductivity of the samples was studied depending on the temperature. XRD analyses indicated that the filling process decreased the π − π stacking distance of PT chains. The most significant shift was observed in the C‐S band of PTh depending on the filling process. Thermal stability of the PTh increased with increasing concentration of Co3O4. Filling process reduced the surface roughness of PTh. The ac conductivity analyses indicated that charge transport mechanism of the samples was consistent with corraleted barrier hopping (CBH) model. The conductivity of PTh increased about 18 times for maximum filling level depending on temperature and frequency. The thermal stability and controllable ac conductivity properties of PTh/Co3O4 nanocomposites showed that they can be used in the production of micro/nano‐sized electronic circuit elements with lower cost. POLYM. ENG. SCI., 57:1168–1178, 2017. © 2017 Society of Plastics Engineers

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Section: Resultsmentioning

confidence: 60%

PTh/Co₃O₄ nanocomposites as new conducting materials for micro/nano‐sized electronic devices

Özkazanç

2017

Polymer Engineering & Sci

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“…There was a slight increase in the thermal resistance of the two-spray P3HT sample after thermal baking. Both PS and P3HT have been demonstrated to be chemically stable at temperatures above 130 • C [18,24], so the increase in resistance observed for the two-spray P3HT samples is likely due to other factors such as local spot-to-spot variation in the CNT forest morphology or local loosening of the interface bond during sample handling. The overall results from thermal baking suggest that the polymer coatings used here are stable over the temperature range studied and that the process may be suitable for integration with high power density devices.…”

Section: Resultsmentioning

confidence: 99%

Carbon nanotube thermal interfaces enhanced with sprayed on nanoscale polymer coatings

et al. 2013

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Vertical carbon nanotube (CNT) forests bonded at room temperature with sprayed on nanoscale polymer coatings are found by measurement to produce thermal resistances that are on a par with those of conventional metallic solders. These results are achieved by reducing the high contact resistance at CNT tips, which has hindered the development of high performance thermal interface materials based on CNTs. A spray coating process is developed for depositing nanoscale coatings of polystyrene and poly-3-hexylthiophene onto CNT forests, as a bonding agent that mitigates thermal resistance by enhancing the area available for heat transfer at CNT contacts. Resistances as low as 4.9 ± 0.3 mm(2) K W(-1) are achieved for the entire polymer coated CNT interface structure. The suitability of the spray coating process for large-scale implementation and the role of polymer and CNT forest thickness in determining the thermal resistance are also examined.

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“…Segundo Ramani et al (2010), a velocidade de uma reação depende da extensão da conversão (α), temperatura (T) e tempo (t). Essa dependência é expressa conforme Equação 1, onde k(T) é a constante de conversão e f(α) é a função da reação.…”

Section: Modelo De Cinética Livre De Viazovkinunclassified

Estudo Cinético Da Decomposição Térmica Dos Ácidos Mirístico E Oléico E Do Óleo De Pinhão Manso via Análise Termogravimétrica

Almeida¹,

Bruce²,

Barbosa³

et al. 2015

Anais Do XX Congresso Brasileiro De Engenharia Química

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RESUMO -Este trabalho propõe o estudo cinético da decomposição térmica dos ácidos mirístico e oléico, e do óleo de pinhão manso via análise termogravimétrica. Os testes foram realizados em uma termobalança sob fluxo de nitrogênio, utilizando uma faixa de temperatura de 30-900°C, em diferentes taxas de aquecimento. As curvas TG/DTG mostram que os compostos modelos apresentam uma única etapa de perda de massa, e o óleo de pinhão manso, duas etapas de perda. As curvas DTA demonstram o comportamento endotérmico de parte dos eventos. Os parâmetros cinéticos foram estimados a partir do modelo de cinética livre proposto por Vyazovkin. Os valores obtidos para a energia média de ativação na decomposição térmica completa dos ácidos mirístico e oléico e do óleo de pinhão manso foram, respectivamente, 86,4 kJ.mol -1 ; 80,1 kJ.mol -1 e 132,4 kJ.mol -1 . INTRODUÇÃOO aumento na demanda por fontes renováveis de energia, o esgotamento das reservas de petróleo de fácil extração e a crescente preocupação com a preservação ambiental tem incentivado o desenvolvimento de biocombustíveis, conforme citado por Huber et al. (2006). O uso de oleaginosas que não competem com a alimentação visando a produção de biocombustíveis têm atraído um crescente interesse durante as duas últimas décadas. Segundo Azam et al. (2005), óleos vegetais são constituídos por ácidos graxos ligados através do grupo carboxílico com um esqueleto de glicerol, diferindo na quantidade de carbonos que compõem a cadeia e presença, ou ausência de insaturações. Biswas e Sharma (2013) afirmam que o óleo de pinhão manso (Jatropha curcas), rico em ácidos graxos livres, pode ser considerado uma promissora fonte de biocombustíveis. Kumar et al. (2010) relatam que os principais problemas associados à utilização de óleos vegetais in natura como combustíveis líquidos são a instabilidade química, alta viscosidade e formação de depósitos de carbono nos motores. Desse modo, o craqueamento de óleos vegetais surge como uma alternativa promissora para a produção de biocombustíveis derivados de oleaginosas.

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Application of model-free kinetics to the thermal and thermo-oxidative degradation of poly(3-hexyl thiophene)

Cited by 26 publications

References 38 publications

PTh/Co₃O₄ nanocomposites as new conducting materials for micro/nano‐sized electronic devices

PTh/Co₃O₄ nanocomposites as new conducting materials for micro/nano‐sized electronic devices

Carbon nanotube thermal interfaces enhanced with sprayed on nanoscale polymer coatings

Estudo Cinético Da Decomposição Térmica Dos Ácidos Mirístico E Oléico E Do Óleo De Pinhão Manso via Análise Termogravimétrica

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Application of model-free kinetics to the thermal and thermo-oxidative degradation of poly(3-hexyl thiophene)

Cited by 26 publications

References 38 publications

PTh/Co3O4 nanocomposites as new conducting materials for micro/nano‐sized electronic devices

PTh/Co3O4 nanocomposites as new conducting materials for micro/nano‐sized electronic devices

Carbon nanotube thermal interfaces enhanced with sprayed on nanoscale polymer coatings

Estudo Cinético Da Decomposição Térmica Dos Ácidos Mirístico E Oléico E Do Óleo De Pinhão Manso via Análise Termogravimétrica

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PTh/Co₃O₄ nanocomposites as new conducting materials for micro/nano‐sized electronic devices

PTh/Co₃O₄ nanocomposites as new conducting materials for micro/nano‐sized electronic devices