Norbornene-functionalized diblock copolymers via ring-opening metathesis polymerization for magnetic nanoparticle stabilization

    Authors

    K. D. Belfield;L. Zhang

    Comments

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    Abbreviated Journal Title

    Chem. Mat.

    Keywords

    RUTHENIUM CARBENE COMPLEXES; IRON-OXIDE NANOCLUSTERS; OLEFIN METATHESIS; BLOCK-COPOLYMERS; AQUEOUS-MEDIA; FILMS; Chemistry, Physical; Materials Science, Multidisciplinary

    Abstract

    There are a number of strategies in molecular nanoscience to prepare stabilized magnetic nanocomposites, including the use of polymeric surfactants. Ring-opening metathesis polymerization ( ROMP) was used to prepare a series of novel, well-defined diblock copolymers of bicyclo[2.2.1]hept-5-ene 2-carboxylic acid 2-cyanoethyl ester and bicyclo[2.2.1]hept-2-ene, consisting of both anchoring and steric stabilizing blocks. Cyanoester groups were incorporated into the norbornene polymers to chelate and stabilize iron oxide magnetic nanoparticles. These polynorbornene-based copolymers were characterized by GPC, along with H-1 NMR, FTIR, DSC, and TGA. Nanostructured maghemite (gamma-Fe2O3) magnetic ferrofluids were prepared using diblock copolymers as stabilizers in toluene or cyclohexanone, via thermal decomposition of Fe(CO)(5) and subsequent oxidation of the iron nanoparticles. Transmission electron microscopic images showed a highly crystalline structure of monodispersed gamma-Fe2O3 nanoparticles, with average particle sizes varying from 5 to 7 nm.

    Journal Title

    Chemistry of Materials

    Volume

    18

    Issue/Number

    25

    Publication Date

    1-1-2006

    Document Type

    Article

    Language

    English

    First Page

    5929

    Last Page

    5936

    WOS Identifier

    WOS:000242515600020

    ISSN

    0897-4756

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