Shape and volume of cavities in thermoplastic molecular sieves based on syndiotactic polystyrene

G. Milano*, V. Venditto, G. Guerra, Luigi Cavallo, P. Ciambelli, D. Sannino

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

168 Scopus citations

Abstract

The empty space in different crystalline and clathrate phases of syndiotactic polystyrene (s-PS) is evaluated by a numerical procedure. It is shown that the δ form is nanoporous and includes two identical cavities per unit cell, whose shape and volume are characterized. As a consequence of clathration, the unit cell of the δ form is enlarged and the cavity is able to include molecules definitely larger than its starting size. Sorption experiments of nitrogen at 77 K for s-PS powders in different crystalline forms are also presented. These can be interpreted by inclusion of three nitrogen molecules per cavity of the δ crystalline phase and hence give an independent estimate of its volume.

Original languageEnglish (US)
Pages (from-to)1506-1511
Number of pages6
JournalChemistry of Materials
Volume13
Issue number5
DOIs
StatePublished - Sep 26 2001

ASJC Scopus subject areas

  • Chemistry(all)
  • Chemical Engineering(all)
  • Materials Chemistry

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