Synchrotron radiation studies on even-odd and odd-even nylons

Aliphatic polyamides derived from odd diamine or odd dicarboxylic acid units cannot adopt a conventional sheet structure when molecular chains have an all trans conformation. However, typical fiber diffraction patterns of this sheet structure were observed in several polyamides derived from odd unit...

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Autores: Franco García, María Lourdes|||0000-0001-5968-285X, Puiggalí Bellalta, Jordi|||0000-0002-0640-4474, Ricart López, Albert, Morales Gámez, Laura Teresa, Soto, David
Tipo de recurso: artículo
Fecha de publicación:2009
País:España
Institución:Universitat Politècnica de Catalunya (UPC)
Repositorio:UPCommons. Portal del coneixement obert de la UPC
Idioma:inglés
OAI Identifier:oai:upcommons.upc.edu:2117/11703
Acceso en línea:https://hdl.handle.net/2117/11703
https://dx.doi.org/10.1088/1757-899X/14/1/012006
Access Level:acceso abierto
Palabra clave:Synchrotron radiation
Polymers
Sincrotrons
Radiació
Polímers
Àrees temàtiques de la UPC::Enginyeria química
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spelling Synchrotron radiation studies on even-odd and odd-even nylonsFranco García, María Lourdes|||0000-0001-5968-285XPuiggalí Bellalta, Jordi|||0000-0002-0640-4474Ricart López, AlbertMorales Gámez, Laura TeresaSoto, DavidSynchrotron radiationPolymersSincrotronsRadiacióPolímersÀrees temàtiques de la UPC::Enginyeria químicaAliphatic polyamides derived from odd diamine or odd dicarboxylic acid units cannot adopt a conventional sheet structure when molecular chains have an all trans conformation. However, typical fiber diffraction patterns of this sheet structure were observed in several polyamides derived from odd units such as nylons 65 and 56. Consequently, a new structure based on the establishment of intermolecular hydrogen bonds along two different directions was postulated. Real-time temperature dependence of X-ray diffraction patterns for nylons 65 and 56 was studied by synchrotron radiation to gain understanding of the Brill transition usually occurring in polyamides. Significant differences were found between the temperature dependence of both nylons, although a transition towards a monoclinic structure characterized by a single equatorial reflection around 0.425-0.420 nm was observed to occur at high temperatures. This transition was reversible for nylon 65 only. In this case, a characteristic hysteresis effect was found.Peer ReviewedIOP PUBLISHING LTD.20092009-09-0820112011-03-08journal articlehttp://purl.org/coar/resource_type/c_6501VoRhttp://purl.org/coar/version/c_970fb48d4fbd8a85info:eu-repo/semantics/articleapplication/pdfhttps://hdl.handle.net/2117/11703https://dx.doi.org/10.1088/1757-899X/14/1/012006reponame:UPCommons. Portal del coneixement obert de la UPCinstname:Universitat Politècnica de Catalunya (UPC)Inglésengopen accesshttp://purl.org/coar/access_right/c_abf2Attribution-NonCommercial-NoDerivs 3.0 Spainhttp://creativecommons.org/licenses/by-nc-nd/3.0/es/info:eu-repo/semantics/openAccessoai:upcommons.upc.edu:2117/117032026-05-27T15:37:01Z
dc.title.none.fl_str_mv Synchrotron radiation studies on even-odd and odd-even nylons
title Synchrotron radiation studies on even-odd and odd-even nylons
spellingShingle Synchrotron radiation studies on even-odd and odd-even nylons
Franco García, María Lourdes|||0000-0001-5968-285X
Synchrotron radiation
Polymers
Sincrotrons
Radiació
Polímers
Àrees temàtiques de la UPC::Enginyeria química
title_short Synchrotron radiation studies on even-odd and odd-even nylons
title_full Synchrotron radiation studies on even-odd and odd-even nylons
title_fullStr Synchrotron radiation studies on even-odd and odd-even nylons
title_full_unstemmed Synchrotron radiation studies on even-odd and odd-even nylons
title_sort Synchrotron radiation studies on even-odd and odd-even nylons
dc.creator.none.fl_str_mv Franco García, María Lourdes|||0000-0001-5968-285X
Puiggalí Bellalta, Jordi|||0000-0002-0640-4474
Ricart López, Albert
Morales Gámez, Laura Teresa
Soto, David
author Franco García, María Lourdes|||0000-0001-5968-285X
author_facet Franco García, María Lourdes|||0000-0001-5968-285X
Puiggalí Bellalta, Jordi|||0000-0002-0640-4474
Ricart López, Albert
Morales Gámez, Laura Teresa
Soto, David
author_role author
author2 Puiggalí Bellalta, Jordi|||0000-0002-0640-4474
Ricart López, Albert
Morales Gámez, Laura Teresa
Soto, David
author2_role author
author
author
author
dc.subject.none.fl_str_mv Synchrotron radiation
Polymers
Sincrotrons
Radiació
Polímers
Àrees temàtiques de la UPC::Enginyeria química
topic Synchrotron radiation
Polymers
Sincrotrons
Radiació
Polímers
Àrees temàtiques de la UPC::Enginyeria química
description Aliphatic polyamides derived from odd diamine or odd dicarboxylic acid units cannot adopt a conventional sheet structure when molecular chains have an all trans conformation. However, typical fiber diffraction patterns of this sheet structure were observed in several polyamides derived from odd units such as nylons 65 and 56. Consequently, a new structure based on the establishment of intermolecular hydrogen bonds along two different directions was postulated. Real-time temperature dependence of X-ray diffraction patterns for nylons 65 and 56 was studied by synchrotron radiation to gain understanding of the Brill transition usually occurring in polyamides. Significant differences were found between the temperature dependence of both nylons, although a transition towards a monoclinic structure characterized by a single equatorial reflection around 0.425-0.420 nm was observed to occur at high temperatures. This transition was reversible for nylon 65 only. In this case, a characteristic hysteresis effect was found.
publishDate 2009
dc.date.none.fl_str_mv 2009
2009-09-08
2011
2011-03-08
dc.type.none.fl_str_mv journal article
http://purl.org/coar/resource_type/c_6501
VoR
http://purl.org/coar/version/c_970fb48d4fbd8a85
dc.type.openaire.fl_str_mv info:eu-repo/semantics/article
format article
dc.identifier.none.fl_str_mv https://hdl.handle.net/2117/11703
https://dx.doi.org/10.1088/1757-899X/14/1/012006
url https://hdl.handle.net/2117/11703
https://dx.doi.org/10.1088/1757-899X/14/1/012006
dc.language.none.fl_str_mv Inglés
eng
language_invalid_str_mv Inglés
language eng
dc.rights.none.fl_str_mv open access
http://purl.org/coar/access_right/c_abf2
Attribution-NonCommercial-NoDerivs 3.0 Spain
http://creativecommons.org/licenses/by-nc-nd/3.0/es/
dc.rights.openaire.fl_str_mv info:eu-repo/semantics/openAccess
rights_invalid_str_mv open access
http://purl.org/coar/access_right/c_abf2
Attribution-NonCommercial-NoDerivs 3.0 Spain
http://creativecommons.org/licenses/by-nc-nd/3.0/es/
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv application/pdf
dc.publisher.none.fl_str_mv IOP PUBLISHING LTD.
publisher.none.fl_str_mv IOP PUBLISHING LTD.
dc.source.none.fl_str_mv reponame:UPCommons. Portal del coneixement obert de la UPC
instname:Universitat Politècnica de Catalunya (UPC)
instname_str Universitat Politècnica de Catalunya (UPC)
reponame_str UPCommons. Portal del coneixement obert de la UPC
collection UPCommons. Portal del coneixement obert de la UPC
repository.name.fl_str_mv
repository.mail.fl_str_mv
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score 15.301603

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