Preparation of a magnetic-responsive polycation with a tetrachloroferrate anion
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Poly[3-(methacrylamido)propyltrimethylammonium chloride] (PMAPTAC) with a well-controlled structure was reacted with FeCl 3 to exchange the counter anion from chloride (Cl-) to tetrachloroferrate (FeCl 4 -) to prepare a magnetic-responsive polymer (PMAPTAFe). PMAPTAFe powder was attracted to a neodymium magnet. A cast film of PMAPTAFe, which can be prepared from the aqueous solution, also showed magneticresponsive behavior.