Modern solid state NMR techniques and concepts in structural studies of synthetic polymers

Abstract

In this mini-review, we present the solid state nuclear magnetic resonance (NMR) methods which trace the new tendency in structural studies of synthetic polymers. The review is organized into three sections. In the first part, short theoretical background and introduction to very fast magic angle spinning NMR technique with sample rotation 60 kHz are shown. The second part presents method for enhancing the sensitivity of NMR experiments by application of dynamic nuclear polarization magic angle spinning technique. In the third section, the power of the NMR crystallography approach which can be used for fine refinement of polymers structure on the atomic level is discussed.

Proton and Carbon-13 Dynamic Nuclear Polarization of Methylated β-Cyclodextrins

“…Apart from medical imaging, DNP has been exploited successfully in other fields ranging from high-resolution NMR structural characterization of organic polymers − to the study of hybrid silica materials, , from solid-state and liquid magic-angle spinning NMR of proteins ,, to hyperpolarization of condensed gases adsorbed on mesoporous architectures. − …”

Dynamic Nuclear Polarization of β-Cyclodextrin Macromolecules

“…The sensitivity enhancement provided by DNP can be fruitfully exploited also in fields different from medical imaging. In fact, in recent years, DNP has become a fundamental tool for structural studies in condensed matter, with applications spanning from the characterization of polymers to the development of heterogeneous catalysts and hybrid materials, − from magnetic hyperpolarization of gases − to the solid-state NMR studies of proteins. − …”

Synthesis of a Stable Solid Acid Catalyst from Chloromethyl Polystyrene through a Simple Sulfonation for Pretreatment of Lignocellulose in Aqueous Solution

“…The structure of the alkyl carbon represented by the NMR spectrum peak at 0–43 ppm does not fluctuate at the peak position [43] . In addition, the aromatic carbon with a peak of 110–160 ppm is similar to the former, revealing the integrity of the polymer molecular structure [44] . More importantly, the structure of benzenesulfonic acid with a peak at 139 ppm was not changed at either peak intensity or peak position, [35] indicating that the SCPR140‐1 recycled for five times still retained the sulfonic acid group well.…”