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Confinement of iPP crystallites within mesoporous SBA-15 channels in extruded iPP-SBA-15 nanocomposites studied by Small Angle X-ray scattering

AuthorsBarranco-García, Rosa; López-Majada, Juan M.; Martínez, Juan C.; Gómez-Elvira González, José Manuel ; Pérez, Ernesto ; Cerrada, María L.
KeywordsiPP-SBA-15 nanocomposites
Real-time variable-temperature synchrotron
SAXS/WAXD experiments
Depth sensing indentation measurements
Issue Date22-Jun-2018
CitationMicroporous and Mesoporous Materials 272 (2018) 209–216
AbstractThe main objective of this research is the study of different nanocomposites based on isotactic polypropylene (iPP) and mesoporous SBA-15 silica prepared by melt extrusion, analyzing the possible effect of this filler on the polymorphic behavior of iPP and the eventual observation of confinement effects. Thus, simultaneous Small Angle X-ray Scattering/Wide Angle X-ray Diffraction (SAXS/WAXD) synchrotron experiments at variable temperature have been performed on several iPP nanocomposites with different contents of SBA-15 mesoporous particles. Real-time variable-temperature SAXS measurements turned out a very useful tool to analyze the confinement of iPP crystallites within SBA-15 channels, and also to determine the most probable long spacing of chains located outside the SBA-15 nanospaces. Importance of these structural features is assessed by changes in the mechanical response of the final materials, finding that the presence of mesoporous particles leads to a reinforcing effect and contribute to improve the final dimensional stability
Publisher version (URL)https://doi.org/10.1016/j.micromeso.2018.06.032
Appears in Collections:(ICTP) Artículos
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