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- Title
Online Coupling of Size-Exclusion Chromatography and Low-Field <sup>1</sup>H NMR Spectroscopy.
- Authors
Cudaj, Markus; Guthausen, Gisela; Hofe, Thorsten; Wilhelm, Manfred
- Abstract
Current results and limitations of a novel SEC-MR-NMR (size-exclusion chromatography-medium resolution nuclear magnetic resonance) system are presented, delivering a direct correlation of chemical structure and molecular weight. A 20 MHz 1H NMR spectrometer based on permanent magnets was combined with a SEC setup. The NMR sensitivity was improved by digital filters, shims, and a self-built flow probe when compared with time-domain instruments. For optimum NMR signal-to-noise ratio ( S/ N) of polymer fractions and concomitantly reduced S/ N of solvent signals, deuterated solvents or protonated solvents, with solvent suppression, were applied. Results are presented after optimization of both NMR and chromatographic components such as column dimension and volume flow.
- Publication
Macromolecular Chemistry & Physics, 2012, Vol 213, Issue 18, p1933
- ISSN
1022-1352
- Publication type
Article
- DOI
10.1002/macp.201200290