Abstract
Investigation of the complexing reaction between polyethylene glycol and iodine in an iodine-potassium iodide aqueous system has shown that at high triodide ion concentrations and low free iodine concentrations an insoluble complex having a stoichiometric ratio of one mole of potassium triodide to approximately 10 monomeric units of the polymer is reversibly formed. Potassium ion is apparently a prerequisite for formation of this complex. At much higher free iodine concentrations a second insoluble complex containing a considerable amount of iodine per se is reversibly formed from the first. The stoichiometry of the second complex formed appears to be such that one molecule of iodine is taken up by two monomeric units of ethylene oxide in the polymeric chain. The concentration dependencies of both complexing reactions on iodide, potassium ion and free iodine are presented in this report. The interaction in a sodium iodide-iodine system also results in the formation of an insoluble complex. This interaction does not appear to be analagous to that in the potassium iodide-iodine system. Bromine in the presence of bromide ion has also been shown to form a reversible insoluble complex with polyethylene
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