Studies on pyrolysis of Nomex polyaramid fibers

The pyrolysis behavior of Nomex [poly(m-phenylene isophtalamide)] fibers under argon was studied using thermoanalytical and infrared spectroscopic methods to get direct information on the progressive changes undergone by the solid material and its carbon fiber residues. Simultaneous thermogravimetry...

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Autores: Villar Rodil, Silvia, Martínez Alonso, Amelia, Díez Tascón, Juan Manuel
Tipo de recurso: artículo
Estado:Versión aceptada para publicación
Fecha de publicación:2001
País:España
Institución:Consejo Superior de Investigaciones Científicas (CSIC)
Repositorio:DIGITAL.CSIC. Repositorio Institucional del CSIC
OAI Identifier:oai:dnet:digitalcsic_::65352f7eb0923c1a5a0569324a8eaae7
Acceso en línea:http://hdl.handle.net/10261/172777
Access Level:acceso abierto
Palabra clave:Aramid fibers
DRIFTS
DTA
Nomex
TG
Thermal decomposition
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spelling Studies on pyrolysis of Nomex polyaramid fibersVillar Rodil, SilviaMartínez Alonso, AmeliaDíez Tascón, Juan ManuelAramid fibersDRIFTSDTANomexTGThermal decompositionThe pyrolysis behavior of Nomex [poly(m-phenylene isophtalamide)] fibers under argon was studied using thermoanalytical and infrared spectroscopic methods to get direct information on the progressive changes undergone by the solid material and its carbon fiber residues. Simultaneous thermogravimetry (TG)–differential thermal analysis (DTA) measurements were carried out in a thermobalance in order to establish the different steps in the thermal degradation of Nomex. Samples pyrolyzed to various carefully controlled extents were prepared in the same thermobalance by heating under the same conditions to different temperatures selected as a function of the TG/DTA results. Diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS) spectra of all samples were obtained in order to follow changes in chemical composition along the pyrolysis process. Rupture of hydrogen bonds takes place in the 300–400°C interval, being followed by a complex thermal event involving two weight loss steps and three endothermal DTA peaks. An intermediate aryl nitrile forms from heterolytic decomposition of Nomex above 433°C and decomposes totally at 698°C. From 473°C onwards, the DRIFTS spectra evidence a drop in intensity of amide bands in parallel with increases in primary amine and carbonyl groups. Total disappearance of amide bands (607°C) is followed by a DTA exotherm at 627°C attributed to condensation reactions. Accordingly, CC skeletal vibrations in polyaromatic networks develop confirming the occurrence of a progressive loss of heteroatoms and an increase in aromaticity.Financial support from CICYT (project 1FD1997–1915) is gratefully acknowledgedPeer reviewedElsevierComisión Interministerial de Ciencia y Tecnología, CICYT (España)Villar Rodil, Silvia [0000-0002-5832-9971]Martínez Alonso, Amelia [0000-0002-7183-0859]Díez Tascón, Juan Manuel [0000-0001-9219-7266]Consejo Superior de Investigaciones Científicas [https://ror.org/02gfc7t72]201820182001info:eu-repo/semantics/articlehttp://purl.org/coar/resource_type/c_6501Postprintinfo:eu-repo/semantics/acceptedVersionhttp://hdl.handle.net/10261/172777reponame:DIGITAL.CSIC. Repositorio Institucional del CSICinstname:Consejo Superior de Investigaciones Científicas (CSIC)Ingléshttps://doi.org/10.1016/S0165-2370(00)00124-8Síinfo:eu-repo/semantics/openAccessoai:dnet:digitalcsic_::65352f7eb0923c1a5a0569324a8eaae72026-05-22T06:33:51Z
dc.title.none.fl_str_mv Studies on pyrolysis of Nomex polyaramid fibers
title Studies on pyrolysis of Nomex polyaramid fibers
spellingShingle Studies on pyrolysis of Nomex polyaramid fibers
Villar Rodil, Silvia
Aramid fibers
DRIFTS
DTA
Nomex
TG
Thermal decomposition
title_short Studies on pyrolysis of Nomex polyaramid fibers
title_full Studies on pyrolysis of Nomex polyaramid fibers
title_fullStr Studies on pyrolysis of Nomex polyaramid fibers
title_full_unstemmed Studies on pyrolysis of Nomex polyaramid fibers
title_sort Studies on pyrolysis of Nomex polyaramid fibers
dc.creator.none.fl_str_mv Villar Rodil, Silvia
Martínez Alonso, Amelia
Díez Tascón, Juan Manuel
author Villar Rodil, Silvia
author_facet Villar Rodil, Silvia
Martínez Alonso, Amelia
Díez Tascón, Juan Manuel
author_role author
author2 Martínez Alonso, Amelia
Díez Tascón, Juan Manuel
author2_role author
author
dc.contributor.none.fl_str_mv Comisión Interministerial de Ciencia y Tecnología, CICYT (España)
Villar Rodil, Silvia [0000-0002-5832-9971]
Martínez Alonso, Amelia [0000-0002-7183-0859]
Díez Tascón, Juan Manuel [0000-0001-9219-7266]
Consejo Superior de Investigaciones Científicas [https://ror.org/02gfc7t72]
dc.subject.none.fl_str_mv Aramid fibers
DRIFTS
DTA
Nomex
TG
Thermal decomposition
topic Aramid fibers
DRIFTS
DTA
Nomex
TG
Thermal decomposition
description The pyrolysis behavior of Nomex [poly(m-phenylene isophtalamide)] fibers under argon was studied using thermoanalytical and infrared spectroscopic methods to get direct information on the progressive changes undergone by the solid material and its carbon fiber residues. Simultaneous thermogravimetry (TG)–differential thermal analysis (DTA) measurements were carried out in a thermobalance in order to establish the different steps in the thermal degradation of Nomex. Samples pyrolyzed to various carefully controlled extents were prepared in the same thermobalance by heating under the same conditions to different temperatures selected as a function of the TG/DTA results. Diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS) spectra of all samples were obtained in order to follow changes in chemical composition along the pyrolysis process. Rupture of hydrogen bonds takes place in the 300–400°C interval, being followed by a complex thermal event involving two weight loss steps and three endothermal DTA peaks. An intermediate aryl nitrile forms from heterolytic decomposition of Nomex above 433°C and decomposes totally at 698°C. From 473°C onwards, the DRIFTS spectra evidence a drop in intensity of amide bands in parallel with increases in primary amine and carbonyl groups. Total disappearance of amide bands (607°C) is followed by a DTA exotherm at 627°C attributed to condensation reactions. Accordingly, CC skeletal vibrations in polyaromatic networks develop confirming the occurrence of a progressive loss of heteroatoms and an increase in aromaticity.
publishDate 2001
dc.date.none.fl_str_mv 2001
2018
2018
dc.type.none.fl_str_mv info:eu-repo/semantics/article
http://purl.org/coar/resource_type/c_6501
Postprint
info:eu-repo/semantics/acceptedVersion
format article
status_str acceptedVersion
dc.identifier.none.fl_str_mv http://hdl.handle.net/10261/172777
url http://hdl.handle.net/10261/172777
dc.language.none.fl_str_mv Inglés
language_invalid_str_mv Inglés
dc.relation.none.fl_str_mv https://doi.org/10.1016/S0165-2370(00)00124-8
Sí
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.publisher.none.fl_str_mv Elsevier
publisher.none.fl_str_mv Elsevier
dc.source.none.fl_str_mv reponame:DIGITAL.CSIC. Repositorio Institucional del CSIC
instname:Consejo Superior de Investigaciones Científicas (CSIC)
instname_str Consejo Superior de Investigaciones Científicas (CSIC)
reponame_str DIGITAL.CSIC. Repositorio Institucional del CSIC
collection DIGITAL.CSIC. Repositorio Institucional del CSIC
repository.name.fl_str_mv
repository.mail.fl_str_mv
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