Structure and Re-orientation in the First Stage for Polyamide/Iodine Complex. (II) Change of Structures on Iodine Doping and Termination.

Introduction Polyamide-6 (PA6, Nylon-6) is a popular hydrophilic polymer with high crystallinity, and it also shows ordered structures even in coordinated structures with guest molecules or ions. "Polyamide-6/iodine complex" can be prepared by easy and rapid operation using an aqueous solution containing polyiodide ions at room temperature.[1-3] As one of interesting behaviors for the complex structure, rapid formation of the complex is reported; the complex structures are formed rapidly in a few seconds.[4] However, the initial structure observed in the first stage shows different spacing of intercalated structures from essential one shown in ordinary stable structure.[5] In this work, in-situ observation for the doubly oriented film of PA6 was achieved using an enclosing housing.[6]