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Free volume and interstitial mesopores in silica filled poly(I-trimethylsilyl-l-propyne) nanocomposites

Winberg, Petra LU ; Desitter, K; Dotremont, C; Mullens, S; Vankelecom, I F J and Maurer, Frans LU (2005) In Macromolecules 38(9). p.3776-3782
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.... (More)
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. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Macromolecules
volume
38
issue
9
pages
3776 - 3782
publisher
The American Chemical Society
external identifiers
  • wos:000228738600035
  • scopus:18744405120
ISSN
0024-9297
DOI
10.1021/ma047369j
language
English
LU publication?
yes
id
9e7dcc4b-24cb-436a-ac11-6bb18fece115 (old id 152536)
date added to LUP
2007-07-13 16:48:49
date last changed
2017-11-19 03:30:10
@article{9e7dcc4b-24cb-436a-ac11-6bb18fece115,
  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.},
  author       = {Winberg, Petra and Desitter, K and Dotremont, C and Mullens, S and Vankelecom, I F J and Maurer, Frans},
  issn         = {0024-9297},
  language     = {eng},
  number       = {9},
  pages        = {3776--3782},
  publisher    = {The American Chemical Society},
  series       = {Macromolecules},
  title        = {Free volume and interstitial mesopores in silica filled poly(I-trimethylsilyl-l-propyne) nanocomposites},
  url          = {http://dx.doi.org/10.1021/ma047369j},
  volume       = {38},
  year         = {2005},
}