Title

Norbornene-Functionalized Diblock Copolymers Via Ring-Opening Metathesis Polymerization For Magnetic Nanoparticle Stabilization

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 1H NMR, FTIR, DSC, and TGA. Nanostructured maghemite (γ-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 γ-Fe2O3 nanoparticles, with average particle sizes varying from 5 to 7 nm. © 2006 American Chemical Society.

Publication Date

12-12-2006

Publication Title

Chemistry of Materials

Volume

18

Issue

25

Number of Pages

5929-5936

Document Type

Article

Personal Identifier

scopus

DOI Link

https://doi.org/10.1021/cm062004u

Socpus ID

33846179295 (Scopus)

Source API URL

https://api.elsevier.com/content/abstract/scopus_id/33846179295

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