Title

Poly(styrene-b-ethylene/butylene-b-styrene)/Cobalt Ferrite Magnetic Nanocomposites

Document Type

Article

Publication Date

6-15-2005

Department

Polymers and High Performance Materials

Abstract

Magnetic nanoparticles were created in or around the sulfonated (S) polystyrene domains in a poly[styrene-b-(ethylene-co-butylene)-b-styrene)] block copolymer (BCP) using an in situ inorganic precipitation procedure. The sBCP was neutralized with a mixed iron/cobalt chloride electrolyte, and the doped samples were converted to their oxides by reaction with sodium hydroxide. Transmission electron microscopy indicated the presence of nanoparticles having diameters of 20-50 nm. Metal oxide particle structures were studied using wide angle X-ray diffraction, which revealed that they were inverse spinel cobalt iron oxide crystals. Thermogravimetric analysis provided the weight percent of the inorganic component and nanocomposite thermal decomposition profile. Modulated differential scanning calorimetry studies suggested that the inorganic inclusions were selectively grown in the polystyrene hard block phase. These nanocomposites were shown, using alternating gradient magnetometry, to be ferrimagnetic at room temperature. (c) 2005 Wiley Periodicals, Inc.

Publication Title

Journal of Polymer Science Part B-Polymer Physics

Volume

43

Issue

12

First Page

1475

Last Page

1485