Study of the thermal degradation of polychlorotrifluoroethylene, poly(vinylidene fluoride) and copolymers of chlorotrifluoroethylene and vinylidene fluoride

Zulfiqar, Sonia; Zulfiqar, Muhammad; Rizvi, Masroor; Munir, Arshad; McNeill, I.C.

doi:10.1016/0141-3910(94)90015-9

Cited by 122 publications

(114 citation statements)

References 4 publications

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“…Given that CO and CO 2 are also produced, other minor components like isobutylene and ethers of isobutene must also be present in the gas phase. The literature 31,32 indicates that monofluorides and monochlorides of these compounds should also be present in some small quantity. The work of Zulfiqar et al 31,32,34 focused on the random copolymers of CTFE with methyl methacrylate, VDF and styrene.…”

Section: Thermal Properties Of Cf 3 Terminated Poly(ctfe-alt-ibuve) Cmentioning

confidence: 99%

“…For fully fluorinated polymers, the usual degradation routes involve either unzipping from the chain ends or breakdown due to random chain scission while for partially fluorinated polymers, dehydrofluorination is usually the main mechanism of degradation 31,32 . Polymers synthesised via nonfluorinated initiators are highly susceptible to unzipping from the chain ends or to oxidative attack initiated at the nonfluorinated chain ends.…”

Section: Thermal Properties Of Cf 3 Terminated Poly(ctfe-alt-ibuve) Cmentioning

confidence: 99%

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Radical copolymerisation of chlorotrifluoroethylene with isobutyl vinyl ether initiated by the persistent perfluoro-3-ethyl-2,4-dimethyl-3-pentyl radical

et al. 2015

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Section: Thermal Properties Of Cf 3 Terminated Poly(ctfe-alt-ibuve) Cmentioning

confidence: 99%

Section: Thermal Properties Of Cf 3 Terminated Poly(ctfe-alt-ibuve) Cmentioning

confidence: 99%

Radical copolymerisation of chlorotrifluoroethylene with isobutyl vinyl ether initiated by the persistent perfluoro-3-ethyl-2,4-dimethyl-3-pentyl radical

et al. 2015

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“…Birnbaum et al, 1968 studied the toxicity of the pyrolysis of PCTFE and found it to increase rapidly with rising temperature. The thermal degradation of PCTFE and copolymers of it were studied by Zulfiqar et al, 1994 who found the monomer (i.e. chlorotrifluoroethene) to be the major product and amongst others chloropentafluoropropene in traces.…”

Section: Resultsmentioning

confidence: 99%

First atmospheric observations of three chlorofluorocarbons

Laube

Engel

2008

Atmos. Chem. Phys.

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Abstract.We report the first atmospheric observations of the Chlorofluorocarbons (CFCs) trifluorochloroethene, 3-chloropentafluoropropene and 4,4-dichlorohexafluoro-1-butene by means of Gas Chromatography with Electron Capture and Mass Spectrometric detection (GC-ECD-MS) in air samples taken at the Taunus Observatory operated by the University of Frankfurt (Main) and the Jungfraujoch High Altitude Research Station in Switzerland. These substances belong to a class of CFCs containing a double bond and are suspected to originate from the production and thermal degradation of widely used fluoropolymers like polychlorotrifluoroethene (PCTFE). Their atmospheric lifetimes are expected to be rather short. A quantitative calibration could only be derived for trifluorochloroethene but not for the other species by now. Thus, we use a relative sensitivity method to get a first indication of the observed atmospheric abundances. Identification was possible because of an air plume containing high concentrations of these substances. We suggest that the abundances found on this occasion originated from a local source. However, we have also observed the novel CFCs in air masses representative of background conditions, though with much lower concentrations. These species and some of their degradation products are toxic and could also be relevant for stratospheric and tropospheric ozone depletion.

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“…Para PVDF puro, verifica-se uma única perda de massa em torno de 450°C atribuído à degradação térmica do de sua cadeia [32] . Com relação à Pani desdopada observa-se dois estágios de perda de massa.…”

Section: Os Termogramas Das Amostras Pvdf/pani Desdopadaunclassified

Preparação e caracterização do compósito PVDF/Pani com partículas de níquel

et al. 2017

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ResumoNeste trabalho partículas de níquel foram incorporadas através da mistura física do pó resultante da mistura PVDF/Pani obtido por síntese química. Filmes homogêneos foram obtidos através da prensagem a temperatura de 180°C. A partir dos resultados pode-se notar alterações favoráveis e desfavoráveis nas propriedades do compósito após a incorporação e como estas tornam-se dependentes da incorporação. Os resultados de difratometria apresentaram picos característicos tanto da fase α da matriz polimérica e das partículas de níquel, e juntamente com as analises térmicas, que não há alteração na estrutura conformacional e a configuracional. Mesmo apresentando uma boa estabilidade térmica a incorporação indica que além da presença do polímero condutor como o aumento de partículas são prejudiciais às propriedades mecânicas finais da amostra. As micrografias apresentam as partículas de forma dispersas ao longo do filme e determinantes para os valores de condutividade elétrica e obtenção de uma fase magnética. Palavras-chave: polianilina, poli(fluoreto de vinilideno), níquel, compósito, propriedades magnéticas. AbstractIn this work nickel particles were incorporated by physically mixing of resulting powder blends of PVDF/Pani, obtained by chemical synthesis. Homogeneous films were obtained by hot pressing at 180 °C. From the results could be noted favorable and unfavorable changes in the properties of composites after incorporation and how this become dependent of the incorporation. The results of diffraction showed the characteristic peaks of both the α phase of the polymer matrix and the nickel particles, and with thermal analysis, no change in the conformational structure and configurational. Even with a good thermal stability incorporating, indicates that besides the presence of the conducting polymer as the increase of particles are harmful to the final mechanical properties of the sample. Micrographs showed particles dispersed throughout the film and determinants to electrical conductivity values and achieving a magnetic phase. Keywords: polyaniline, poly (vinylidene fluoride), nickel, composite, magnetic property. IntroduçãoTradicionalmente ao estudar se magnetismo e suas propriedades, em particular o ferromagnetismo, está se estudando, por exemplo, elementos inorgânicos como ferro, níquel, cobalto, ligas, cerâmicas e óxidos, os quais apresentam o comportamento magnético, e também estudos quando estes elementos são incorporados em matrizes poliméricas na forma extrínseca [1][2][3] . Porém a exploração de materiais orgânicos com a descoberta dos polímeros intrinsecamente condutores trouxe uma nova gama de questões no campo da pesquisa como novas propriedades magnéticas e óticas além da possibilidade de materiais mais leves, com alta condutividade e flexibilidade [2][3][4][5][6][7][8][9] . Assim a investigação do comportamento magnético dos polímeros condutores intrínsecos, se inclui o estudo de seus elementos constituintes, como carbono, hidrogênio, nitrogênio, anéis aromáticos e a própria conjunção e conformaç...

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Study of the thermal degradation of polychlorotrifluoroethylene, poly(vinylidene fluoride) and copolymers of chlorotrifluoroethylene and vinylidene fluoride

Cited by 122 publications

References 4 publications

Radical copolymerisation of chlorotrifluoroethylene with isobutyl vinyl ether initiated by the persistent perfluoro-3-ethyl-2,4-dimethyl-3-pentyl radical

Radical copolymerisation of chlorotrifluoroethylene with isobutyl vinyl ether initiated by the persistent perfluoro-3-ethyl-2,4-dimethyl-3-pentyl radical

First atmospheric observations of three chlorofluorocarbons

Preparação e caracterização do compósito PVDF/Pani com partículas de níquel

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