From Polymer Reference Book

3.4 Nuclear Magnetic Resonance (NMR) Spectroscopy

3.4.1 Instrumentation

This technique is at its most useful in organic structure identification and has numerous applications in polymer analysis. Instrument suppliers are listed in Appendix 1.

One instrument on the market is the Varian Gemini superconducting NMR spectrometer. This instrument combines excellent computer and radio frequency technology. It uses a cryogenic superconducting magnet system providing high stability and low operating cost, excellent field homogeneity, and stable drift characteristics. The Gemini can be used with a wide variety of probes, including the standard computer switchable 1H/ 13C or broadband probes. The broadband probe provides complete coverage of the most common NMR nuclei, including fluorine. Zero susceptibility probe design provides improved lineshape. Advanced coil design means highly efficient power transfer to the sample, resulting in complete spin excitation and decoupling of much lower power levels than is typically required. An automatic sample manager unit uses robotics to ensure reliable operation with a high degree of flexibility. The removable 50- or 100-sample tray can be added or removed at any time, permitting loading of one tray whilst another is in use.

3.4.2 Applications

Scientists studying polymers use NMR as a major method of analysis. The repeating structure of polymer chains, for example, provides very simple NMR spectra that clearly identify important structural characteristics. Tacticity, chain branching, composition, and residual monomer content are but a few of the many parameters that can be positively determined from a single NMR spectrum.

Deuterium and proton wideline are...

Products & Services
NMR Probes
NMR probes incorporate radio frequency coils that are tuned for use in certain magnetic field strengths and detect specific nuclei. They can be switched out depending on the specific nuclei to be studied or the type of sample to be analyzed.
Spectrometer Repair Services
Spectrometer repair services provide a cost-effective solution for refurbishment and repair for all types of spectrometers and spectrometer system components.
NMR Spectrometers
NMR (Nuclear Magnetic Resonance) spectrometers are analytical devices that exploit the magnetic properties of certain atomic nuclei to determine physical and chemical properties of atoms or the molecules in which they are contained.
NMR Tubes

NMR tubes hold samples in NMR spectrometers. They are thin glass walled tubes, uniformly thick and balanced for smooth spinning.

ESR/EPR tubes hold samples in ESR or EPR spectrometers. They are thin glass walled tubes, uniformly thick, that produce low background noise.

Topics of Interest

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