X-Band DNP Hyperpolarization of Viscous Liquids and Polymer Melts

Macromolecular Rapid Communications
Oliver NeudertKerstin Münnemann

Abstract

NMR studies of synthetic polymers and biomacromolecules, which provide insight into the conformation and dynamics of these materials, can benefit strongly from the increased sensitivity offered by dynamic nuclear polarization (DNP) and other hyperpolarizing methods. In this study (1) H DNP nuclear spin hyperpolarization of two polybutadiene samples, representing a supercooled liquid and an entangled polymer melt, is demonstrated at 0.35 T magnetic field strength and at temperatures between -80 and +50 °C. Electron spin polarization transfer from the α,γ-bisdiphenylene-β-phenylallyl radical to the sample nuclei is achieved by the Overhauser and solid effect. DNP signal enhancements are studied, varying the electron spin resonance offset, microwave power, and sample temperature. The influence of spin relaxation times, line widths, and molecular dynamics are discussed. The results show promising, up to 15-fold NMR signal enhancements using noncryogenic temperatures and an inexpensive setup that is less technically demanding than current high-field DNP setups.

References

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Citations

May 3, 2016·Magnetic Resonance in Chemistry : MRC·Ahmet Peksoz
Aug 16, 2016·Journal of Magnetic Resonance·Oliver NeudertSiegfried Stapf
Jul 14, 2017·Chemphyschem : a European Journal of Chemical Physics and Physical Chemistry·Bulat GizatullinCarlos Mattea
Jan 12, 2021·Journal of Magnetic Resonance·Bulat GizatullinSiegfried Stapf
May 1, 2021·The Journal of Physical Chemistry. B·Bulat GizatullinSiegfried Stapf
Oct 24, 2019·The Journal of Physical Chemistry. B·Bulat GizatullinSiegfried Stapf

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