Investigation of domain size in polymer membranes using double-quantum-filtered spin diffusion magic angle spinning NMR

B. R. Cherry, C. H. Fujimoto, C. J. Cornelius, T. M. Alam

Research output: Contribution to journalArticle

43 Scopus citations


Solid-state 1H magic angle spinning (MAS) NMR was used to investigate sulfonated Diels-Alder poly(phenlylene) polymer membranes. Under high spinning speed 1H MAS conditions, the proton environments of the sulfonic acid and phenylene polymer backbone are resolved. A double-quantum (DQ) filter using the rotor-synchronized back-to-back (BABA) NMR multiple-pulse sequence allowed the selective suppression of the sulfonic proton environment in the 1H MAS NMR spectra. This DQ filter in conjunction with a spin diffusion NMR experiment was then used to measure the domain size of the sulfonic acid component within the membrane. In addition, the temperature dependence of the sulfonic acid spin-spin relaxation time (T 2) was determined, providing an estimate of the activation energy for the proton dynamics of the dehydrated membrane.

Original languageEnglish (US)
Pages (from-to)1201-1206
Number of pages6
Issue number4
Publication statusPublished - Feb 22 2005


ASJC Scopus subject areas

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

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