Abstract
The anisotropy of the second moment of the proton NMR absorption line was measured at several temperatures on Kevlar and Conex, the fibers of poly(phenylene phthalamide). The curve of the rigid-state second moment with two peaks at ω=0 and 90°C (where ω is the alignment angle, i.e., the angle between the fiber axis and the main magnetic field) was calculated for each of these polyamides and found to be in good agreement with the curve measured at −150°C. Although the motional narrowing was very slight for Conex [poly(m-phenylene isophthalamide)] in the temperature range from −150 to +170°C, it was appreciable (ca. 2 gauss2) for Kevlar [poly(p-phenylene terephthalamide)] between −50 and +150°C, suggesting the occurrence of the 180° flip-flop motion of the p-phenylene rings.
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V. Frosini and E. Butta, J. Polym. Sci., A-2, 9, 253 (1971).
A. E. Woodward and J. Landis, J. Polym. Sci., Polym. Phys. Ed., 10, 2051 (1971).
K. Haraguchi, T. Kajiyama, and M. Takayanagi, Rep. Prog. Polym. Phys. Jpn., XIX, 303 (1976).
M. G. Northolt and J. J. van Arsten, J. Polym. Sci., Polym. Lett. Ed., 11, 333 (1973).
M. G. Northolt, Eur. Polym. J., 10, 799 (1974).
T. Shibata and S. Iwayanagi, Polym. J., 10, 599 (1978).
H. G. Olf and A. Peterlin, J. Polym. Sci., A-2, 8, 771 (1970).
H. G. Olf and A. Peterlin, J. Polym. Sci., A-2, 8, 753 (1970).
H. Kakida, Y. Chatani, and H. Tadokoro, J. Polym. Sci., Polym. Phys. Ed., 14, 427 (1976).
K. Tashiro, M. Kobayashi, and H. Tadokoro, Macromolecules, 10, 413 (1977).
F. Lauprêtre and L. Monnerie, Eur. Polym. J., 14, 415 (1978).
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Suglya, I., Kobayashi, S., Iwayanagi, S. et al. A Broadline NMR Study of the Molecular Motions in Aromatic Polyamides: Poly(p-phenylene terephthalamide) and Poly(m-phenylene isophthalamide). Polym J 14, 43–50 (1982). https://doi.org/10.1295/polymj.14.43
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DOI: https://doi.org/10.1295/polymj.14.43
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