Confinement of iPP chains in the interior of SBA-15 mesostructure ascertained by gas transport properties in iPP-SBA-15 nanocomposites prepared by extrusion

Different nanocomposites based on isotactic polypropylene (iPP) and mesoporous SBA-15 silica have been prepared by melt extrusion as an attempt of incorporating iPP within the nanometric SBA-15 pores by the action of shear forces during processing. The observed inclusion of iPP chains in the SBA-15...

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Autores: Barranco-García, Rosa, López-Majada, Juan M., Lorenzo, Vicente, Gómez-Elvira González, José Manuel, Cerrada, María L.
Formato: artículo
Fecha de publicación:2019
País:España
Recursos:Consejo Superior de Investigaciones Científicas (CSIC)
Repositorio:DIGITAL.CSIC. Repositorio Institucional del CSIC
OAI Identifier:oai:digital.csic.es:10261/174817
Acesso em linha:http://hdl.handle.net/10261/174817
Access Level:acceso abierto
Palavra-chave:iPP/SBA-15 nanocomposites
Diffusion coefficient
Synchrotron SAXS measurements
Reinforcement
Permeability
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spelling Confinement of iPP chains in the interior of SBA-15 mesostructure ascertained by gas transport properties in iPP-SBA-15 nanocomposites prepared by extrusion Barranco-García, Rosa López-Majada, Juan M. Lorenzo, Vicente Gómez-Elvira González, José Manuel Cerrada, María L. iPP/SBA-15 nanocomposites Diffusion coefficient Synchrotron SAXS measurements Reinforcement Permeability Different nanocomposites based on isotactic polypropylene (iPP) and mesoporous SBA-15 silica have been prepared by melt extrusion as an attempt of incorporating iPP within the nanometric SBA-15 pores by the action of shear forces during processing. The observed inclusion of iPP chains in the SBA-15 leads to a change in the gas transport properties of the resultant iPP/SBA-15 membranes together with the improvement of their ultimate mechanical performance. Existence of confinement effects is observed, consequently, by the exhibited transport properties and is confirmed through real-time variable-temperature Small Angle X-ray Scattering (SAXS) experiments with synchrotron radiation. The former indicates that the mesostructure of silica is full, i.e., these particles essentially act as fillers. The latest has been proved by the presence of a discontinuity in the intensity of the (100) SBA-15 diffraction, which turn SAXS measurements at variable temperature into a valuable means to corroborate the development of iPP crystallites within SBA-15 channels. Moreover, SAXS profiles provide information about the most probable long spacing of chains located outside the SBA-15 nanospaces. On the other hand, changes in the β viscoelastic relaxation have been correlated to the influence of SBA-15 in the iPP amorphous regions. All the structural features have been crucial for the understanding the mechanical response shown by these nanocomposites. Mesoporous particles exert a reinforcing role and reduce the deformation capacity in the ultimate materials as their content is increased. This work was supported by the Agencia Estatal de Investigación (AEI, Spain) together with the European Regional Development Fund (FEDER, UE) [MAT2016-79869-C2-1-P]. Ms. R Barranco-García also thanks her pre-doctoral funding [BES-2014–070972] associated with the Ministerio de Economía y Competitividad (MINECO, Spain) [MAT2013-47972-C2-1-P] project. The synchrotron experiments were performed at beamline BL11-NCD at ALBA Synchrotron Light Facility with the collaboration of ALBA staff. Authors are grateful for the funding received to perform these measurements. Peer Reviewed Elsevier http://hdl.handle.net/10261/174817
title Confinement of iPP chains in the interior of SBA-15 mesostructure ascertained by gas transport properties in iPP-SBA-15 nanocomposites prepared by extrusion
spellingShingle Confinement of iPP chains in the interior of SBA-15 mesostructure ascertained by gas transport properties in iPP-SBA-15 nanocomposites prepared by extrusion
Barranco-García, Rosa
iPP/SBA-15 nanocomposites
Diffusion coefficient
Synchrotron SAXS measurements
Reinforcement
Permeability
title_short Confinement of iPP chains in the interior of SBA-15 mesostructure ascertained by gas transport properties in iPP-SBA-15 nanocomposites prepared by extrusion
title_full Confinement of iPP chains in the interior of SBA-15 mesostructure ascertained by gas transport properties in iPP-SBA-15 nanocomposites prepared by extrusion
title_fullStr Confinement of iPP chains in the interior of SBA-15 mesostructure ascertained by gas transport properties in iPP-SBA-15 nanocomposites prepared by extrusion
title_full_unstemmed Confinement of iPP chains in the interior of SBA-15 mesostructure ascertained by gas transport properties in iPP-SBA-15 nanocomposites prepared by extrusion
title_sort Confinement of iPP chains in the interior of SBA-15 mesostructure ascertained by gas transport properties in iPP-SBA-15 nanocomposites prepared by extrusion
author Barranco-García, Rosa
author_facet Barranco-García, Rosa
López-Majada, Juan M.
Lorenzo, Vicente
Gómez-Elvira González, José Manuel
Cerrada, María L.
author_role author
author2 López-Majada, Juan M.
Lorenzo, Vicente
Gómez-Elvira González, José Manuel
Cerrada, María L.
author2_role author
author
author
author
topic iPP/SBA-15 nanocomposites
Diffusion coefficient
Synchrotron SAXS measurements
Reinforcement
Permeability
topic_facet iPP/SBA-15 nanocomposites
Diffusion coefficient
Synchrotron SAXS measurements
Reinforcement
Permeability
description Different nanocomposites based on isotactic polypropylene (iPP) and mesoporous SBA-15 silica have been prepared by melt extrusion as an attempt of incorporating iPP within the nanometric SBA-15 pores by the action of shear forces during processing. The observed inclusion of iPP chains in the SBA-15 leads to a change in the gas transport properties of the resultant iPP/SBA-15 membranes together with the improvement of their ultimate mechanical performance. Existence of confinement effects is observed, consequently, by the exhibited transport properties and is confirmed through real-time variable-temperature Small Angle X-ray Scattering (SAXS) experiments with synchrotron radiation. The former indicates that the mesostructure of silica is full, i.e., these particles essentially act as fillers. The latest has been proved by the presence of a discontinuity in the intensity of the (100) SBA-15 diffraction, which turn SAXS measurements at variable temperature into a valuable means to corroborate the development of iPP crystallites within SBA-15 channels. Moreover, SAXS profiles provide information about the most probable long spacing of chains located outside the SBA-15 nanospaces. On the other hand, changes in the β viscoelastic relaxation have been correlated to the influence of SBA-15 in the iPP amorphous regions. All the structural features have been crucial for the understanding the mechanical response shown by these nanocomposites. Mesoporous particles exert a reinforcing role and reduce the deformation capacity in the ultimate materials as their content is increased.
publishDate 2019
format article
url http://hdl.handle.net/10261/174817
eu_rights_str_mv openAccess
publisher Elsevier
institution Consejo Superior de Investigaciones Científicas (CSIC)
collection DIGITAL.CSIC. Repositorio Institucional del CSIC
reponame_str DIGITAL.CSIC. Repositorio Institucional del CSIC
instname_str Consejo Superior de Investigaciones Científicas (CSIC)
_version_ 1878436904664301568
publishDateSort 2019
author_browse Barranco-García, Rosa
Cerrada, María L.
Gómez-Elvira González, José Manuel
Lorenzo, Vicente
López-Majada, Juan M.
publisherStr Elsevier
score 6,924472

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