Structure of iodide ion arrays in iodinated nylon 6 and the chain orientation induced by iodine in nylon 6 films
| Autor: | Samuel Krimm, John P. Sibilia, A. B. Szollosi, N. S. Murthy |
|---|---|
| Rok vydání: | 1984 |
| Předmět: |
chemistry.chemical_classification
Aqueous solution Materials science Iodide General Engineering chemistry.chemical_element Polymer Orientation (graph theory) Iodine Amorphous solid Ion Crystallography chemistry.chemical_compound Iodide ion Nylon 6 Chain (algebraic topology) chemistry Structural Biology X-ray crystallography Polymer chemistry |
| Zdroj: | Acta Crystallographica Section A Foundations of Crystallography. 40:C318-C319 |
| ISSN: | 0108-7673 |
| DOI: | 10.1107/s0108767384090590 |
| Popis: | Two species of iodide ions (I3− and I5−) are found in iodine—nylon 6 complexes. Orientation of I5− arrays (most likely I2/I3− complex) along the polymer chain and I3− ions perpendicular to the chain axis in uniaxially drawn films and in films with planar orientation suggests that there is and intrinsic relation between the direction of iodide ion arrays and nylon 6 chains. When an unoriented film of nylon 6 in the amorphous or the α crystalline form is treated with an aqueous solution of iodine—potassium iodide, the I3− species in the resulting iodine—nylon complex lie in planes parallel to the surface of the film, and I2/I3− units are oriented normal to the surface of the film. The γ form obtained by desorbing the iodine from this complex shows considerable uniaxial rientation with the nylon chains oriented perpendicular to the plane of the film; this orientation is maintained during the γ to α transition. It is proposed that the iodine-induced orientation of the nylon 6 chains is due to the nucleating effects of the iodide ion species as the iodine diffuses unidirectionally into the film. |
| Databáze: | OpenAIRE |
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