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

Kaźmierski, Sławomir; Pawlak, T.; Jeziorna, Agata; Potrzebowski, Marek J.

doi:10.1002/pat.3780

Cited by 10 publications

(5 citation statements)

References 66 publications

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“…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. − …”

Section: Introductionmentioning

confidence: 99%

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

et al. 2018

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H and C dynamic nuclear polarizations have been studied inC-enriched β-cyclodextrins doped with (2,2,6,6-tetramethylpiperidin-1-yl)oxyl free radical. H andC polarizations raised above 7.5 and 7%, respectively, and for both nuclear species, the transfer of polarization from the electron spins appears to be consistent with a thermal mixing scenario for a concentration of 9 C nuclei per molecule. When the concentration is increased to 21C nuclei per molecule, a decrease in the spin-lattice relaxation and polarization buildup rates is observed. This reduction is associated with the bottleneck effect induced by the decrease in the number of electron spins per nucleus when both the nuclear spin-lattice relaxation and the polarization occur through the electron non-Zeeman reservoir. C nuclear spin-lattice relaxation has been studied in the 1.8-340 K range, and the effects of internal molecular motions and of the free radicals on the relaxation are discussed.C hyperpolarization performances and room-temperature spin-lattice relaxation times show that these are promising materials for future biomedical applications.

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Section: Introductionmentioning

confidence: 99%

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

et al. 2018

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“…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. − …”

Section: Introductionmentioning

confidence: 99%

Dynamic Nuclear Polarization of β-Cyclodextrin Macromolecules

et al. 2017

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H dynamic nuclear polarization and nuclear spin-lattice relaxation rates have been studied in amorphous complexes of β-cyclodextrins doped with different concentrations of the TEMPO radical. Nuclear polarization increased up to 10% in the optimal case, with a behavior of the buildup rate (1/T) and of the nuclear spin-lattice relaxation rate (1/T) consistent with a thermal mixing regime. The temperature dependence of 1/T and its increase with the radical concentration indicate a relaxation process arising from the modulation of the electron-nucleus coupling by the glassy dynamics. The high-temperature relaxation is driven by molecular motions, and 1/T was studied at room temperature in liquid solutions for dilution levels close to the ones typically used for in vivo studies.

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“…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.…”

Section: Resultsmentioning

confidence: 78%

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

Wang

et al. 2020

ChemSusChem

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A stable solid acid catalyst, SCPR140‐1, was synthesized from chloromethyl polystyrene resin (CPR) and used for catalytic pretreatment of corncob in aqueous solution. Under the optimized pretreatment condition, 73.07 % of xylose was directly obtained, and the enzymatic digestibility of treated residue reached up to 94.65 %, indicating that the SCPR140‐1 had high selectivity for xylose production and effectively deconstructed the structure of corncob. The −CH2Cl group of CPR was substituted by −SO3H through the sulfonation, and the −SO3H was stably bound on the catalyst during the pretreatment process. Compared with other similar reports, the SCPR140‐1 was not only synthesized through a simpler process but also had a more stable catalytic activity during multiple recycling runs.

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

Cited by 10 publications

References 66 publications

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

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

Dynamic Nuclear Polarization of β-Cyclodextrin Macromolecules

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

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