期刊
MICROPOROUS AND MESOPOROUS MATERIALS
卷 272, 期 -, 页码 209-216出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.micromeso.2018.06.032
关键词
iPP-SBA-15 nanocomposites; Real-time variable-temperature synchrotron measurements; SAXS/WAXD experiments; Depth sensing indentation measurements
类别
资金
- AEI/FEDER, UE [MAT2016-79869-C2-1-P]
- MINECO [BES-2014-070972, MAT2013-47972-C2-1-P]
The 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.
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