Thermal analysis of acrylonitrile polymerization and cyclization in the presence of N,N-dimethylformamide

M. A. Aviles; J. M. Gines; J. C. del RioJ. PascualJ. L. Perez-RodriguezP. J. Sanchez-Soto

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Thermal analysis of acrylonitrile polymerization and cyclization in the presence of N,N-dimethylformamide

机译：Thermal analysis of acrylonitrile polymerization and cyclization in the presence of N,N-dimethylformamide

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This paper examines the polymerization of acrylonitrile to poly(acrylonitrile)(PAN), and its cyclization, in bulk form and using N,N-dimethylformamide (DMF) as solvent in which both monomer and polymer are soluble. Thermal analysis of the resultant products after polymerization has been performed by DSC and pyrolysis gas chromatography/mass spectrometry (Py-GC/MS). Scanning electron microscopy has been used to study the morphology of the resultant products and after thermal treatments. The DSC thermal curve of PAN-DMF sample is quite different from the PAN bulk sample, showing a single sharp exothermic peak associated with mitrile group polymerization (cyclization) of PAN at lower temperature (240℃) than that of bulk PAN sample (314℃). Cyclization of PAN was confirmed by IR spectroscopy. It was found that the amide molecules are difficult to eliminate completely in the product obtained after the polymerization reaction, even after prolonged heating at 110℃, and remain occluded. The formation of a complex by dipolar bonding is also possible and it is discussed. It is concluded that the amount of heat evolved as well as the temperature interval over which it is released are influenced by the chemical processing of PAN when using DMF as solvent of both monomer and polymer. Pyrolysis of these PAN samples revealed the release of occluded molecules of DMF, and several compounds containing nitrogen produced from the thermal degradation processes. All these results are interesting to know the chemical processing of carbon fibres and activated carbon fibres from PAN modified precursors.

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来源
《Journal of thermal analysis and calorimetry》 |2002年第1期|177-188|共12页
作者
M. A. Aviles; J. M. Gines; J. C. del RioJ. PascualJ. L. Perez-RodriguezP. J. Sanchez-Soto;
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作者单位

Instituto de Ciencia de Materiales de Sevilla (ICMSE), Centro Mixto Consejo Superior de Investigaciones Cientificas (C.S.I.C.), Universidad de Sevilla, c/Americo Vespucio s/n, Isla de la Cartuja, 41092, Sevilla, Spain;

Departamento de Farmacia y Tecnologia Farmaceutica, Facultad de Farmacia, Universidad de Sevilla, c/Profesor Garcia Gonzalez s/n, 41071, Sevilla, Spain;

Instituto de Recursos Naturales y Agrobiologia de Sevilla, C.S.I.C., P.O. Box 1052, 41080, Sevilla, SpainDepartamento de Ingenieria Civil, de Materiales y Fabricacion, Escuela Tecnica Superior de Ingenieros Industriales, Universidad de malaga, 29013, Malaga, Spain;

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正文语种英语
中图分类物理化学（理论化学）、化学物理学;
关键词
acrylonitrile; cyclization; DMF; DSC; hexanedinitrile; morphology; poly(acrylonitrile); pyridine derivatives; pyrolysis; SEM;

Thermal analysis of acrylonitrile polymerization and cyclization in the presence of N,N-dimethylformamide

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