Dielectric Relaxation Spectroscopy of Aliphatic Ionene Bromides and Fluorides in Water: The Role of the Polyion's Charge Density and the Nature of the Counterions

Dielectric relaxation spectroscopy (DRS) was selected to investigate the role of the polycon's charge density and the nature of the counterions of aliphatic ionene bromides and fluorides in water. Ionene bromides were synthesized from the equimolar amounts of N,N,N',N' -tetramethyl-1,x-alkene and 1,y-dibromoalkene (Aldrich) by a polyaddition reaction in dimethylformamide in a room temperature and under an argon atmosphere. The crude product was washed with a large amount of acetone, filtered and dried under vacuum for 48 hours at 318 K. Samples were prepared gravimetrically with Milipore water and the exact counterion concentrations were determined potentiometrically using bromide or fluoride ion selective electrodes and a saturated mercury sulfate electrode as the reference. They were also titrated with standardized solution of AgNO 3 and LaCl3 for bromide and fluoride ionenes.