Dielectric properties of polymer nanoparticle composites

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Polymer 48 (2007) 791e798 www.elsevier.com/locate/polymer

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Dielectric properties of polymer nanoparticle composites Ta-I Yang a, Peter Kofinas b,*

a Department of Chemical and Biomolecular Engineering, University of Maryland, College Park, MD 20742, USA Fischell Department of Bioengineering, Building 090, Room 2113, University of Maryland, College Park, MD 20742-2111, USA

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Received 11 October 2006; received in revised form 8 December 2006; accepted 15 December 2006 Available online 20 December 2006

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Abstract

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Keywords: Block copolymer; Permittivity; Titanium dioxide

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Well-dispersed high dielectric permittivity titanium dioxide (TiO2) nanoparticles were synthesized utilizing a block copolymer as a template. The nanoparticles were confined within microphase separated domains of sulfonated styrene-b-(ethylene-ran-butylene)-b-styrene (S-SEBS) block copolymers. A crosslinker (vinyltrimethoxysilane) was incorporated into the block copolymer matrices in order to decrease the dielectric loss from the free sulfonic acid groups. Dynamic mechanical analysis experiments confirmed that nanoparticles and crosslinker were confined within the crosslinked sulfonated styrene blocks and had no effect on the chain relaxation behavior of [ethylene-ran-butylene] blocks. Dielectric experiments showed that higher permittivity composites can thus be obtained with a significant decrease in loss tan d (
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