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Quadrupole Effects in Solid-State Nuclear Magnetic Resonance

The applicability of nuclear magnetic resonance (NMR) spectroscopy continues to expand in physics, chemistry, material science, geology, biology, and medicine. An increasing range of NMR techniques is employed for either spectroscopic studies or imaging purposes, most becoming possible because of the high magnetic fields of superconducting magnets (almost an order of magnitude higher than ordinary iron magnets), and the availability of fast computers for controlling purposes and final data processing. These improvements together with the realization of fast mechanical sample spinning and new pulse techniques have led to high-resolution solid-state nuclear magnetic resonance. Because the perturbing effect of the electric quadrupole interaction becomes less important at higher magnetic fields, the investigation of powder samples with NMR techniques has become more feasible. As a result, the number of publications concerning NMR studies of quadrupole nuclei in powder samples rapidly increased in the eighties. However, since 1987 this number of publications is rather stable and amounts to about 100 per year.
D. Freude, J. Haase

Solid State NMR of Synthetic Polymers

Over the past ten years or so solid state NMR has become widely used in the study of polymers. The rather late development of solid state NMR, in comparison to solution state, can be attributed to the need for technical developments to permit the acquisition of high resolution solid state NMR spectra. Since the introduction of the combined cross-polarisation and magic angle spinning technique to polymers by Stejskal and Schaeffer an impressive growth has taken place. It is perhaps appropriate then to take stock of the value of solid state NMR, to point out its strengths and weaknesses, within the context of the polymer industry. With this in mind, my aim in this review is not to provide a comprehensive coverage of the literature but rather to use examples to provide an assessment of the use of NMR in the study of solid materials.
N. J. Clayden

Solution NMR of Synthetic Polymers

Nuclear Magnetic Resonance (NMR) Spectroscopy is well recognised as the primary technique for the determination of molecular structure of synthetic polymers. In this article the author aims to illustrate how solution-state NMR is used for molecular structural determinations on a wide range of commercially available polymers.
A. Bunn


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