The influence of polymer molecular-weight distributions on pulsed field gradient nuclear magnetic resonance self-diffusion experiments

B. Håkansson, M. Nydén, O. Söderman*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

86 Citations (Scopus)

Abstract

The influence of polymer molecular-weight distributions on the outcome of pulsed field gradient (PFG) NMR self-diffusion experiments has been considered. The self-diffusion coefficient, D, of monodisperse poly(ethylene oxide) (PEO) polymers has been determined in order to accurately determine the scaling behavior of D both with molecular weight and concentration. In order to investigate the influence of polydispersity on the PFG NMR signal, a model system consisting of ten reasonably monodisperse PEO polymers was made, and the PFG NMR signal intensities were recorded at a low total concentration. The data were analyzed using both inverse Laplace transformation and nonlinear least-squares fitting to a prescribed distribution function of D. Finally, the molecular-weight distribution was obtained by use of the values of the scaling parameters. We also present some model calculations used to investigate the sensitivity of the degree of polydispersity on the NMR signal decays.

Original languageEnglish
Pages (from-to)399-405
Number of pages7
JournalColloid and Polymer Science
Volume278
Issue number5
DOIs
Publication statusPublished - May 2000
Externally publishedYes

Keywords

  • Poly(ethylene oxide)
  • Polydispersity
  • Polymers
  • Pulsed field gradient spin-echo nuclear magnetic resonance
  • Self-diffusion

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