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A nylon 6iodine complex prepared with nylon 6 (polyamide-6, PA6) and provided by immesion in aqueous solutions of polyiodide, In-, showed intercalated structures composed of iodine in which polyiodide ions are coordinated between hydrogen-bonded sheets of nylon 6. This work reports that these intercalated structures can be modified by aging under their swollen condition. After iodine doping with an I2-KI aqueous solution, the most significant intercalation shows primarily 1.56-nm spacing in its WAXD pattern, which is considered to be due to the intercalation of iodine layers between every hydrogen-bonded sheet of nylon 6. While this spacing is almost stable under dry conditions, other structures showing 1.95-nm spacing or greater were revealed or vanished during aging under moist conditions. It is remarkable that the coordinated structures composed of ordered crystalline regions of the polymer dynamically and actively respond to moisture; the diffusion of ions or low-molecular-weight molecules into the iodinated polymer can be achieved easily within the crystallites, and such dynamics can be realized with chain- or sheet-like structures in polymeric materials

Structure of nylon 6/iodine complex. 5: variation of intercalation in complexes induced by humidification