Structure Modification of Isotactic Polypropylene through Chemical Crosslinking: Toughening Mechanism

Reversibly crosslinked isotactic polypropylene (iPP) was prepared in the presence of dicumyl peroxide. The effects of the peroxide oxy-radicals in the melt were investigated in relation to the modification of the polymer. The dynamic rheology analysis of the crosslinking process was carried out by u...

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Detalles Bibliográficos
Autores: Bouhelal, S., Cagiao, M. E., Benachour, D., Baltá Calleja, Francisco José
Tipo de recurso: artículo
Fecha de publicación:2007
País:España
Institución:Consejo Superior de Investigaciones Científicas (CSIC)
Repositorio:DIGITAL.CSIC. Repositorio Institucional del CSIC
OAI Identifier:oai:digital.csic.es:10261/79485
Acceso en línea:http://hdl.handle.net/10261/79485
Access Level:acceso abierto
Palabra clave:Reactive blending
Crosslinking
Interpenetrating networks
Ductile–brittle transition
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spelling Structure Modification of Isotactic Polypropylene through Chemical Crosslinking: Toughening MechanismBouhelal, S.Cagiao, M. E.Benachour, D.Baltá Calleja, Francisco JoséReactive blendingCrosslinkingInterpenetrating networksDuctile–brittle transitionReversibly crosslinked isotactic polypropylene (iPP) was prepared in the presence of dicumyl peroxide. The effects of the peroxide oxy-radicals in the melt were investigated in relation to the modification of the polymer. The dynamic rheology analysis of the crosslinking process was carried out by using a plastograph. The crosslinking reaction was evaluated by the Monsanto method. The resulting structure of the modified samples was studied by means of differential scanning calorimetry (DSC), wide-angle X-ray scattering (WAXS), microhardness, and mechanical properties. The degree of crystallinity of the modified iPP, derived from DSC and WAXS, remains almost unchanged, i.e., the crystalline structure is unaffected, though the lamellar thickness slightly decreases. The impact strength of the crosslinked iPP is greatly improved with reference to that of the unmodified material. A transition from brittle to ductile behavior appears in the modified iPP for all the crosslinking agents studied.Peer reviewed201320132007info:eu-repo/semantics/articlehttp://purl.org/coar/resource_type/c_6501http://hdl.handle.net/10261/79485reponame:DIGITAL.CSIC. Repositorio Institucional del CSICinstname:Consejo Superior de Investigaciones Científicas (CSIC)Ingléshttps://doi.org/10.1002/app.25406info:eu-repo/semantics/openAccessoai:digital.csic.es:10261/794852026-05-22T06:33:51Z
dc.title.none.fl_str_mv Structure Modification of Isotactic Polypropylene through Chemical Crosslinking: Toughening Mechanism
title Structure Modification of Isotactic Polypropylene through Chemical Crosslinking: Toughening Mechanism
spellingShingle Structure Modification of Isotactic Polypropylene through Chemical Crosslinking: Toughening Mechanism
Bouhelal, S.
Reactive blending
Crosslinking
Interpenetrating networks
Ductile–brittle transition
title_short Structure Modification of Isotactic Polypropylene through Chemical Crosslinking: Toughening Mechanism
title_full Structure Modification of Isotactic Polypropylene through Chemical Crosslinking: Toughening Mechanism
title_fullStr Structure Modification of Isotactic Polypropylene through Chemical Crosslinking: Toughening Mechanism
title_full_unstemmed Structure Modification of Isotactic Polypropylene through Chemical Crosslinking: Toughening Mechanism
title_sort Structure Modification of Isotactic Polypropylene through Chemical Crosslinking: Toughening Mechanism
dc.creator.none.fl_str_mv Bouhelal, S.
Cagiao, M. E.
Benachour, D.
Baltá Calleja, Francisco José
author Bouhelal, S.
author_facet Bouhelal, S.
Cagiao, M. E.
Benachour, D.
Baltá Calleja, Francisco José
author_role author
author2 Cagiao, M. E.
Benachour, D.
Baltá Calleja, Francisco José
author2_role author
author
author
dc.subject.none.fl_str_mv Reactive blending
Crosslinking
Interpenetrating networks
Ductile–brittle transition
topic Reactive blending
Crosslinking
Interpenetrating networks
Ductile–brittle transition
description Reversibly crosslinked isotactic polypropylene (iPP) was prepared in the presence of dicumyl peroxide. The effects of the peroxide oxy-radicals in the melt were investigated in relation to the modification of the polymer. The dynamic rheology analysis of the crosslinking process was carried out by using a plastograph. The crosslinking reaction was evaluated by the Monsanto method. The resulting structure of the modified samples was studied by means of differential scanning calorimetry (DSC), wide-angle X-ray scattering (WAXS), microhardness, and mechanical properties. The degree of crystallinity of the modified iPP, derived from DSC and WAXS, remains almost unchanged, i.e., the crystalline structure is unaffected, though the lamellar thickness slightly decreases. The impact strength of the crosslinked iPP is greatly improved with reference to that of the unmodified material. A transition from brittle to ductile behavior appears in the modified iPP for all the crosslinking agents studied.
publishDate 2007
dc.date.none.fl_str_mv 2007
2013
2013
dc.type.none.fl_str_mv info:eu-repo/semantics/article
http://purl.org/coar/resource_type/c_6501
format article
dc.identifier.none.fl_str_mv http://hdl.handle.net/10261/79485
url http://hdl.handle.net/10261/79485
dc.language.none.fl_str_mv Inglés
language_invalid_str_mv Inglés
dc.relation.none.fl_str_mv https://doi.org/10.1002/app.25406
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
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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score 15.812429

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