Magnetic block copolymers (PNIFe-b-PNC) with a well-defined and controllable structure were synthesized via ring opening metathesis polymerization (ROMP) and post modification with ferric trichloride hexahydrate (FeCl3 center dot 6H(2)O). The magnetic properties, surface morphology and antimicrobial activities for Gram-positive bacteria and Gram-negative bacteria of magnetic copolymers were studied. All of the magnetic copolymers were characterized of paramagnetic property. The susceptibilities were affected by the content of imidazolium FeCl4 and the degree of polymerization of copolymers. The maximum magnetic susceptibility was 20.96 x 10(-6) emu/g (PNIFe150-b-PNC50). The magnetic copolymers showed high thermal stability and start to decompose at 350 degrees C. The magnetic copolymers showed higher and broader-spectrum antimicrobial activity, which leads to the well-defined magnetic polymers materials having the potential applications in wide fields such as antimicrobial films. (C) 2016 Wiley Periodicals, Inc.
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