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- W92636974 abstract "This chapter illustrates some examples of the structural and dynamic analyses performed for polyamides such as nylon 4, 6, 7, 11, and 66, including the oriented fibers of aromatic polyamides, poly( m- phenylene isophthalamide) (PMIA) and poly(4-methyl- m -phenylene terephthalamide) (P4-MPTA). The structure of polyamides has been characterized by means of 13 C cross polarization and magic angle spinning (CP/MAS) nuclear magnetic resonance (NMR), 13 C low decoupling (LD)/MAS NMR and 13 C pulse saturation transfer (PST)/MAS NMR methods. The CP/MAS method enhances the 13 C signal of the immobile component and, on the other hand, the LD/MAS and PST/MAS methods enhance the 13 C signal of the mobile component. These methods have been used to characterize the mobile and immobile components of nylon. Orientation-dependent chemical shielding tensors especially 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 PPTA, PMIA, and P4M-MPTA fibers without isotope labeling of the samples." @default.
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- W92636974 date "1998-01-01" @default.
- W92636974 modified "2023-09-26" @default.
- W92636974 title "Polyamides" @default.
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- W92636974 doi "https://doi.org/10.1016/s0167-6881(98)80020-7" @default.
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