Por favor, use este identificador para citar o enlazar a este item:
http://hdl.handle.net/10261/39876
COMPARTIR / EXPORTAR:
SHARE BASE | |
Visualizar otros formatos: MARC | Dublin Core | RDF | ORE | MODS | METS | DIDL | DATACITE | |
Título: | Thermal analysis of acrilonitrile polymerization and cyclization in the presence of N,N-dimethylformamide |
Autor: | Avilés Escaño, Miguel Ángel CSIC ORCID; Ginés, J.M.; Río Andrade, José Carlos del CSIC ORCID ; Pascual-Cosp, José; Pérez-Rodríguez, José Luis CSIC; Sánchez-Soto, Pedro José CSIC ORCID | Palabras clave: | Acrylonitrile Cyclization DMF DSC Hexanedinitrile Morphology Poly(acrylonitrile) Pyridine derivatives Pyrolysis SEM |
Fecha de publicación: | 2002 | Editor: | Kluwer Academic Publishers | Citación: | Journal of Thermal Analysis and Calorimetry 67: 177-188 (2002) | Resumen: | 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 nitrile group polymerization (cyclization) of PAN at lower temperature (240°C) than that of bulk PAN sample (314°C). 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°C, 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. | URI: | http://hdl.handle.net/10261/39876 | ISSN: | 1418-2874 |
Aparece en las colecciones: | (IRNAS) Artículos (ICMS) Artículos |
Ficheros en este ítem:
Fichero | Descripción | Tamaño | Formato | |
---|---|---|---|---|
Thermal analysis of acrilonitrile polymerization.pdf | 180,89 kB | Adobe PDF | Visualizar/Abrir |
CORE Recommender
Page view(s)
335
checked on 17-abr-2024
Download(s)
1.501
checked on 17-abr-2024
Google ScholarTM
Check
NOTA: Los ítems de Digital.CSIC están protegidos por copyright, con todos los derechos reservados, a menos que se indique lo contrario.