Upgrade of NMR facilities at TARRC
The NMR spectrometer service at TARRC was recently upgraded with a Bruker Avance II 300 MHz with a multi-nucleus QNP probe. This instrument replaces the former Bruker AC300 and has a number of new features. In addition to the examination of the chemical composition and structure of compounds and polymers based on the observation of hydrogen (1H) and carbon (13C) nuclei, fluorine (19F) and silicon (29Si) can now be observed. The use of the 19F probe has already been utilized to examine a sample containing a Viton fluoropolymer of unknown grade and it proved possible to distinguish between different Viton grades based on the relative compositions of monomers. The new 29Si facility will help in the analysis of silicone based polymers and additives.
In more common use, the new NMR will continue its important role in rubber and plastics formulation analysis in the Materials Characterization unit to identify polymer blends and to determine the monomer ratios of copolymers. We have considerable experience in this field on the former instrument and the new instrument will have enhanced abilities in this role.
Another role for the spectrometer will be assisting in further developments of cured polymer blend analysis. TARRC has developed considerable expertise in the NMR analysis of crosslink density distribution in vulcanised elastomer blends and the role that crosslink density distribution plays in achieving optimum performance in a rubber product.
NMR spectroscopy at TARRC is not just confined to rubber and polymer related issues. The Bruker Avance II 300MHz spectrometer is well suited to more routine structural analysis of organic chemicals where the use of 2D correlation programs enable a very wide range of chemicals to be analysed.
For more information please contact Colin Hull.