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- W204840302 abstract "This chapter focuses on oriented fibers and polymers. Many different experimental approaches have been used to characterize orientation in polymers, such as, birefringence, ultraviolet-visible light spectroscopy, infrared dichroism, sonic modulus measurements, various X-ray techniques, and nuclear magnetic resonances (NMR). Among these approaches, the rapid methodological development of solid-state NMR has opened up new possibilities for characterization. Orientation-dependent NMR interactions, such as dipole-dipole coupling, quadrupole coupling, and chemical shielding yield structural information on polymers in the solid state. If these parameters are observed for each site in oriented polymers, solid-state NMR methods can give even the atomic coordinates of the polymers. This is especially effective in the determination of the atomic coordinates of peptides or proteins in membrane systems and fibrous proteins, in which the X-ray technique gives only little structural information. Orientation-dependent chemical shielding tensors serve as probes with which the relative orientations of specific bond vectors can be determined. This analytical method can be applied to obtain structural information from oriented polyamide fibers such as poly ( p -phenylene terephthalamide) (PPTA), poly( m -phenylene isophthalamide) (PMIA) and poly(4-methyl- m -phenylene terephthalamide) (P4M-MPTA) fibers without isotope labeling of the samples. Oriented carbonyl carbon labeled poly (ethylene terephthalate) (PET) films has also been analyzed with this method." @default.
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- W204840302 date "1998-01-01" @default.
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- W204840302 title "Oriented Fibers and Polymers" @default.
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- W204840302 doi "https://doi.org/10.1016/s0167-6881(98)80016-5" @default.
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