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Determination of the Persistence Length of an Aromatic Polyamide‐hydrazide by Small‐angle X‐ray Diffraction by W. R. Krigbaum; S. Sasaki is a Materials Science article available to read on EtoBox.

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## Abstract Small‐angle x‐ray diffraction measurements were performed upon dimethyl acetamide (DMAc) solutions of four samples of X‐500, an aromatic polyamide‐hydrazide. The solubility improved as the polymer molecular weight increased, the most soluble sample being in the form of a highly oriented, crystalline fiber. Molecular weights determined from the scattering curves indicate that aggregation was present in all solutions. Its extent varied with the solubility of the sample, increased with polymer concentration and, for the lowest concentrations studied, could be reduced by the addition of acetic acid. Radius of gyration values were smaller than those obtained by light scattering, probably because of insufficient resolution of the camera. The mass per unit length along the chain was found to be 18–20 Å, while the radius of gyration of the cross section was 3.5–4.8 Å. Three of the samples gave nearly the same angular intersection for the coil‐and rodlike regions of the scattering curve. Two of these were whole polymers and the other a narrow fraction. The fact that essentially the same intercept was found in all three cases indicates the persistence length as measured for linea

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Author

W. R. Krigbaum; S. Sasaki

Publisher

Wiley (John Wiley & Sons); Interscience Publishers; Wiley (ISSN 0098-1273)

Published

1981

Language

EN

Field

Materials Science (Physical Sciences)