Use of contrast-enhanced small-angle neutron scattering to monitor the effects of solvent swelling on the pore structure of styrene-divinylbenzene resins

P.J. Hall, D.G. Galan, W.R. Machado, F. Mondragon, E.B. Barria, D.C. Sherrington, J.M. Calo

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Abstract

The pore structure of series of porous styrene-divinylbenzene resins has been monitored both in the non-swollen state and when swollen with a range of solvents of varying Hildebrand solubility parameter using small-angle neutron scattering. It has been shown that the Porod scattering invariants increase as swelling increases, indicating an increase in the interfacial scattering surface area. For the sample prepared with a relatively small amounts of porogen during polymerization, the scattering curves of the acetic acid and toluene swollen samples each consist of two linear regions up to ca. 45 Å is size, corresponding firstly to scattering from swollen, highly crosslinked regions and secondly to mass fractal aggregates of these regions. Samples produced with higher amounts of porogen have a surface fractal structure in the swollen state. Porosity that is closed to the external surface in dry samples is accessible to swelling solvents.
Original languageEnglish
Pages (from-to)463-466
Number of pages3
JournalJournal of the Chemical Society, Faraday Transactions
Volume93
Issue number3
DOIs
Publication statusPublished - 7 Feb 1997

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Keywords

  • small-angle neutron
  • solvent swelling
  • pore structure
  • styrene-divinylbenzene resins

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