Block Copolymer-Mediated Formation of Superparamagnetic Nanocomposites
Abbreviated Journal Title
IRON-OXIDE NANOPARTICLES; OPENING METATHESIS POLYMERIZATION; MAGNETIC; NANOPARTICLES; DIBLOCK COPOLYMERS; CONTRAST AGENTS; NORBORNENE; SIZE; MAGHEMITE; POLYMERS; ACID; Chemistry, Physical; Materials Science, Multidisciplinary
Well-defined diblock copolymers of bicyclo[2.2.1]hept-5-ene-2-carboxylic acid oxiranylmethyl ester, having both anchoring and steric stabilizing blocks in a 1:1 ratio, have been prepared by ring-opening metathesis polymerization (ROMP). The epoxy-containing block copolymer stabilized in situ generated iron oxide (gamma-Fe(2)O(3)) nanoparticles. The epoxy ester group provided strong chelation between the iron-oxide nanoparticle and the polymeric siderophores, producing a stable magnetic nanocomposite. The polymers were characterized by (1)H NMR, GPC, TGA, and DSC. The morphology and crystalline structure of the maghemite-block copolymer nanocomposites were evaluated with TEM and XRD, revealing highly crystalline, monodisperse gamma-Fe(2)O(3) nanoparticles with an average size of 3-5 mm. Interactions between the maghemite nanoparticles and the polymer were observed by FTIR. SQUID magnetometric analysis of the nanocomposites demonstrated superparamagnetism at room temperature with high saturation magnetization.
Chemistry of Materials
"Block Copolymer-Mediated Formation of Superparamagnetic Nanocomposites" (2009). Faculty Bibliography 2000s. 1357.