2024-03-28T17:49:12Zhttp://digital.csic.es/dspace-oai/requestoai:digital.csic.es:10261/1748172021-01-01T05:30:56Zcom_10261_56com_10261_3col_10261_309
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.
European Commission
Ministerio de Economía, Industria y Competitividad (España)
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.
2019-01-28T11:21:03Z
2019-01-28T11:21:03Z
2019
2019-01-28T11:21:03Z
artículo
Journal of Membrane Science 569: 137-148 (2019)
http://hdl.handle.net/10261/174817
10.1016/j.memsci.2018.10.009
http://dx.doi.org/10.13039/501100000780
http://dx.doi.org/10.13039/501100010198
eng
http://dx.doi.org/10.1016/j.memsci.2018.10.009
Sí
info:eu-repo/grantAgreement/MINECO/Plan Estatal de Investigación Científica y Técnica y de Innovación 2013-2016/MAT2016-79869-C2-1-P
info:eu-repo/grantAgreement/MINECO/Plan Estatal de Investigación Científica y Técnica y de Innovación 2013-2016/MAT2013-47972-C2-1-P
openAccess
Elsevier