Title: Free volume and interstitial mesopores in silica filled poly(I-trimethylsilyl-l-propyne) nanocomposites
Authors: Winberg, P ×
Desitter, K
Dotremont, C
Mullens, S
Vankelecom, Ivo
Maurer, FHJ #
Issue Date: May-2005
Series Title: Macromolecules vol:38 issue:9 pages:3776-3782
Conference: date:Lund Univ, Lund Inst Technol, Dept Polymer Sci & Engn, SE-22100 Lund, Sweden; Flemish Inst Technol Res, B-2400 Mol, Belgium; Katholieke Univ Leuven, Fac Appl Biosci & Engn, Ctr Surface Chem & Catalysis, B-3001 Louvain, Belgium
Abstract: The free volume sizes and interstitial mesopore sizes in poly(l-trimethylsilyl-l-propyne) (PTMSP)/silica nanocomposites and the correlation between nitrogen permeability and cavity sizes were studied with positron annihilation lifetime spectroscopy (PALS) at filler concentrations between 0 and 50 wt %. A bimodal free volume distribution was observed for PTMSP, and the size of the larger free volume cavities was significantly increased upon addition of hydrophobic fumed silica. Nanometer-sized interstitial cavities in filler agglomerates were observed in all PTMSP/fumed silica nanocomposites and in neat hydrophobic fumed silica. The radius of these interstitial mesopores in the nanocomposites decreased with decreasing filler concentration. A strong correlation between nitrogen permeability and the volume of the interstitial mesopores in the nanocomposite membranes was observed.
ISSN: 0024-9297
Publication status: published
KU Leuven publication type: IT
Appears in Collections:Centre for Surface Chemistry and Catalysis
× corresponding author
# (joint) last author

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