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Mechanical properties and pervaporation separation performance of CTAB-modified cage-structured POSS-incorporated PVA membrane.
- Source :
-
Journal of Materials Science . Jun2019, Vol. 54 Issue 11, p8319-8331. 13p. 1 Color Photograph, 2 Black and White Photographs, 1 Illustration, 3 Diagrams, 1 Chart, 7 Graphs. - Publication Year :
- 2019
-
Abstract
- Permselective polymeric membranes are important materials for the efficient separation of organic solvents and azeotropic mixtures. In this work, we address an effective strategy to the fabrication of novel high-performance membranes of crosslinked poly(vinyl alcohol) (PVA) by incorporating chemically modified cage-structured polyhedral oligomeric silsesquioxane (m-POSS) through solution casting method. The fabricated PVA/m-POSS system showed excellent mechanical stability as well as good pervaporation performance for the separation of isopropanol (IPA)-water azeotropic mixture. Scanning electron micrographs and atomic force microscopy analysis revealed the homogeneous dispersion of m-POSS in PVA matrix. Differential scanning calorimetric studies showed the rigidification of crosslinked PVA matrix by the incorporation of m-POSS. Tensile strength and Young's modulus of PVA matrix were increased remarkably to 200% and 740%, respectively, in the presence of 5 wt% of m-POSS. Moreover, the membranes exhibited excellent water selectivity, hydrophilicity and excellent anti-fouling properties compared to traditional hydrophilic membranes. At lower filler loading (1.0 wt%), 300% and 200% increase in selectivity and permeance were observed for PVA/m-POSS system over crosslinked PVA. The excellent mechanical properties and other comprehensive properties revealed the potential of the PVA/m-POSS system for the effective separation of azeotropic IPA-water mixture. Modified Maxwell-Stefan model was applied for the theoretical estimation of permeation flux and it was in good agreement with the experimental findings. [ABSTRACT FROM AUTHOR]
- Subjects :
- *PERVAPORATION
*ATOMIC force microscopy
Subjects
Details
- Language :
- English
- ISSN :
- 00222461
- Volume :
- 54
- Issue :
- 11
- Database :
- Academic Search Index
- Journal :
- Journal of Materials Science
- Publication Type :
- Academic Journal
- Accession number :
- 135412456
- Full Text :
- https://doi.org/10.1007/s10853-019-03479-8