Abstract
Poly(vinyl alcohol) (PVA) is known to form the crystalline complexes with iodine ions, in which the linear I3– ions form the columnar arrays and are connected to the neighboring PVA chains of planar-zigzag conformation through the charge transfer between OH groups and I3– ions. In order to clarify the effective OH segmental length necessary for the formation of such an iodine complex along the chain axis, the complex formation behavior has been investigated systematically for a series of ethylene–vinyl alcohol (EVOH) random copolymers on the basis of the experimental data of 2D X-ray diffraction, visible-ultraviolet (UV–Vis) absorption spectra, Raman spectra, and infrared spectra. By comparing the observed X-ray diffraction patterns, the EVOH copolymers with VOH content near 100 mol % were found to take the relatively regular complex II structure, while the EVOH copolymers of 70–50 VOH mol % were found to take the structure of complex I, in which the PVA zigzag chains are packed together randomly with and...
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