NMR Characterization of Cross-Linked Polystyrene Gels

H. D.H. Stöver, Jean Frechet*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

47 Scopus citations

Abstract

Direct polarization magic angle spinning (DP/MAS) NMR is ideally suited for the characterization of solvent-swollen cross-linked polystyrene gels. These gels exemplify a larger group of polymeric materials that undergo rapid but anisotropic reorientation on the molecular scale. The line broadening due to the residual dipolar coupling (1H NMR) or chemical shift anisotropy (13C NMR) in the swollen gel can be removed by moderate-rate magic angle spinning to give highly resolved 1H and 13C NMR spectra. Application of these methods permits full characterization of chemically modified polystyrene resins including well-resolved signals attributed to the cross-link junctions. The complementary nature of DP/MAS and CP/MAS NMR is discussed, as is the possible application of DP/MAS NMR to directly monitor cross-linking polymerization kinetics around the gel point.

Original languageEnglish (US)
Pages (from-to)883-888
Number of pages6
JournalMacromolecules
Volume24
Issue number4
DOIs
StatePublished - Jul 1 1991

ASJC Scopus subject areas

  • Organic Chemistry
  • Polymers and Plastics
  • Inorganic Chemistry
  • Materials Chemistry

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