Article
Block copolymer/ferroelectric nanoparticle nanocomposites
Nanoscale
Document Type
Article
Disciplines
Publication Date
1-1-2013
DOI
10.1039/c3nr03036a
Abstract
Nanocomposites composed of diblock copolymer/ferroelectric nanoparticles were formed by selectively constraining ferroelectric nanoparticles (NPs) within diblock copolymer nanodomains via judicious surface modification of ferroelectric NPs. Ferroelectric barium titanate (BaTiO3) NPs with different sizes that are permanently capped with polystyrene chains (i.e., PS-functionalized BaTiO3NPs) were first synthesized by exploiting amphiphilic unimolecular star-like poly(acrylic acid)-block-polystyrene (PAA-b- PS) diblock copolymers as nanoreactors. Subsequently, PS-functionalized BaTiO3 NPs were preferentially sequestered within PS nanocylinders in the linear cylinder-forming polystyrene-block-poly(methyl methacrylate) (PS-b-PMMA) diblock copolymer upon mixing the BaTiO3 NPs with PS-b-PMMA. The use of PS-b-PMMA diblock copolymers, rather than traditional homopolymers, offers the opportunity for controlling the spatial organization of PS-functionalized BaTiO3 NPs in the PS-b-PMMA/BaTiO3 NP nanocomposites. Selective solvent vapor annealing was utilized to control the nanodomain orientation in the nanocomposites. Vertically oriented PS nanocylinders containing PS-functionalized BaTiO3 NPs were yielded after exposing the PS-b-PMMA/BaTiO3 NP nanocomposite thin film to acetone vapor, which is a selective solvent for PMMA block. The dielectric properties of nanocomposites in the microwave frequency range were investigated. The molecular weight of PS-b-PMMA and the size of BaTiO3 NPs were found to exert an apparent influence on the dielectric properties of the resulting nanocomposites.
Copyright Owner
The Royal Society of Chemistry
Copyright Date
2013
Language
en
File Format
application/pdf
Citation Information
Xinchang Pang, Yanjie He, Beibei Jiang, James Iocozzia, et al.. "Block copolymer/ferroelectric nanoparticle nanocomposites" Nanoscale Vol. 5 (2013) p. 8695 - 8702 Available at: http://works.bepress.com/nicola_bowler/18/
This article is from Nanoscale5 (2013): 8695-8702, doi: 10.1039/c3nr03036a. Posted with permission.