Authors
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Scheler, U.
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Title
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19F NMR on polymers
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Date
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01.03.2023
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Number
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0
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Abstract
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NMR is an ideal method for the characterization of polymers because of the local nature of the interactions that determine the spectrum. <sup>19</sup>F as a probe nucleus combines high receptivity with a wide range of chemical shifts meaning the line position in the spectrum strongly depends on the chemical environment. Experimental challenges for <sup>19</sup>F NMR are discussed. Liquid state NMR, being limited to soluble polymers, provides detailed insight into structure and microstructure. The resolution that can be achieved in various types of experiments is compared. In the solid state the line broadening from orientation dependent interactions like chemical shift anisotropy and dipolar coupling, both homonuclear and heteronuclear, need to be averaged; this is most effectively done by fast magic angle spinning (MAS). Together with the quantitative information in NMR this is used to characterize the structure and conformation of fluoropolymers and to follow their radiation chemistry. Information on molecular mobility contained in NMR relaxation measurements is utilized for characterizing semicrystalline polymers.
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Publisher
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Elsevier
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Wikidata
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Citation
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in: Comprehensive Inorganic Chemistry III / J. Reedijk, K. Poeppelmeier (Eds.). Amsterdam [u.a.]: Elsevier, 2023. 26-34; ISBN 978-0-12-823153-1
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DOI
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https://doi.org/10.1016/B978-0-12-823144-9.00185-0
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Tags
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Book Chapters
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