Structural implications on positron lifetimesin lamellar polyethylene with chain defects

7 pags., 4 figs.

Detalles Bibliográficos
Autores: Baltá Calleja, Francisco José, Serna, J., Vicente, J., Segovia, M. A.
Tipo de recurso: artículo
Fecha de publicación:1985
País:España
Institución:Consejo Superior de Investigaciones Científicas (CSIC)
Repositorio:DIGITAL.CSIC. Repositorio Institucional del CSIC
OAI Identifier:oai:digital.csic.es:10261/243854
Acceso en línea:http://hdl.handle.net/10261/243854
Access Level:acceso abierto
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spelling Structural implications on positron lifetimesin lamellar polyethylene with chain defectsBaltá Calleja, Francisco JoséSerna, J.Vicente, J.Segovia, M. A.7 pags., 4 figs.New positron lifetime data in a series of isothermally crystallized polyethylene pairs with known concentrations of chain defects, having a lamellar structure, have been measured. The materials were characterized by small‐angle and wide‐angle x‐ray scattering techniques. Positron lifetime data were computer analyzed and only three components could be resolved. It is shown that the annihilation mechanisms can be understood in terms of average distance between lamellar crystals (long period), crystal thickness, and chain defect concentration. The present results confirm, in consonance with the conclusions of other authors, the longest component to be due to ortho‐positronium pick‐off annihilation. The intermediate component may be ascribed to positronium trapped at the crystal‐amorphous interface. The application of a three‐state trapping model yields a lifetime of about 900 ps for this state. It is suggested that the shortest component may be due to free positron annihilation, para‐positronium self‐annihilation, and annihilation of positrons from a tightly bound state localized at the chain defects. An approximate calculation provides lifetime values around 250 ps for this short‐lived state.Peer reviewedAmerican Institute of PhysicsComisión Asesora de Investigación Científica y Técnica, CAICYT (España)Consejo Superior de Investigaciones Científicas [https://ror.org/02gfc7t72]202120211985info:eu-repo/semantics/articlehttp://purl.org/coar/resource_type/c_6501http://hdl.handle.net/10261/243854reponame:DIGITAL.CSIC. Repositorio Institucional del CSICinstname:Consejo Superior de Investigaciones Científicas (CSIC)InglésSíinfo:eu-repo/semantics/openAccessoai:digital.csic.es:10261/2438542026-05-22T06:33:51Z
dc.title.none.fl_str_mv Structural implications on positron lifetimesin lamellar polyethylene with chain defects
title Structural implications on positron lifetimesin lamellar polyethylene with chain defects
spellingShingle Structural implications on positron lifetimesin lamellar polyethylene with chain defects
Baltá Calleja, Francisco José
title_short Structural implications on positron lifetimesin lamellar polyethylene with chain defects
title_full Structural implications on positron lifetimesin lamellar polyethylene with chain defects
title_fullStr Structural implications on positron lifetimesin lamellar polyethylene with chain defects
title_full_unstemmed Structural implications on positron lifetimesin lamellar polyethylene with chain defects
title_sort Structural implications on positron lifetimesin lamellar polyethylene with chain defects
dc.creator.none.fl_str_mv Baltá Calleja, Francisco José
Serna, J.
Vicente, J.
Segovia, M. A.
author Baltá Calleja, Francisco José
author_facet Baltá Calleja, Francisco José
Serna, J.
Vicente, J.
Segovia, M. A.
author_role author
author2 Serna, J.
Vicente, J.
Segovia, M. A.
author2_role author
author
author
dc.contributor.none.fl_str_mv Comisión Asesora de Investigación Científica y Técnica, CAICYT (España)
Consejo Superior de Investigaciones Científicas [https://ror.org/02gfc7t72]
description 7 pags., 4 figs.
publishDate 1985
dc.date.none.fl_str_mv 1985
2021
2021
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/10261/243854
url http://hdl.handle.net/10261/243854
dc.language.none.fl_str_mv Inglés
language_invalid_str_mv Inglés
dc.relation.none.fl_str_mv Sí
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.publisher.none.fl_str_mv American Institute of Physics
publisher.none.fl_str_mv American Institute of Physics
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 15.811543

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