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

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Author

  • Petra Winberg
  • K Desitter
  • C Dotremont
  • S Mullens
  • I F J Vankelecom
  • Frans Maurer

Summary, in English

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.

Publishing year

2005

Language

English

Pages

3776-3782

Publication/Series

Macromolecules

Volume

38

Issue

9

Document type

Journal article

Publisher

The American Chemical Society (ACS)

Topic

  • Chemical Sciences

Status

Published

ISBN/ISSN/Other

  • ISSN: 0024-9297