Doubly oriented iodine-doped nylon 6 (iodine-nylon 6 complex) was prepared by immersing nylon 6 in an I2-KI aqueous solution and was studied using X-ray diffraction. The intensities in the X-ray diffraction pattern from the iodine-doped nylon 6 vary with ageing time after doping. The variation is attributed to the rearrangements of polyiodides in the complex. In the complex two kinds of 'one-dimensional' ordered structures give streaks on the layer lines, and a three-dimensional ordered structure (complex crystal) gives Bragg reflections. Just after doping an unstable 'one-dimensional' structure emerges. This subsequently transforms into a stable 'one-dimensional' structure and/or the three-dimensional complex crystal with ageing. The arrangement of polyiodides in the complex has been determined. The unstable 'one-dimensional' structure is incommensurate with the complex crystal; a structural model based on co-ordination of 12 with I~ is proposed on the basis of the intensities of the unstable streaks vanishing with ageing. The complex crystal is concluded to include I~ ions inclining at an angle to the chain axis of nylon 6. The stable 'one-dimensional' structure contains I~ ions which are oriented parallel to the chain axis.
Посилання на статтю:
Structure of iodine-nylon 6 complex: 2. Arrangement of polyiodides in the complex / Akio Kawaguchi // Polymer. – 1994. – Vol 35. – P. 2665-2671.