Title

Block Copolymer-Mediated Formation Of Superparamagnetic Nanocomposites

Abstract

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 (γ-Fe2O3) 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 1H 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 γ-Fe2O3 nanoparticles with an average size of 3-5 nm. 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. © 2009 American Chemical Society.

Publication Date

12-8-2009

Publication Title

Chemistry of Materials

Volume

21

Issue

23

Number of Pages

5644-5653

Document Type

Article

Personal Identifier

scopus

DOI Link

https://doi.org/10.1021/cm902854d

Socpus ID

72949094888 (Scopus)

Source API URL

https://api.elsevier.com/content/abstract/scopus_id/72949094888

This document is currently not available here.

Share

COinS