Reorientation mechanisms of block copolymer/CdSe quantum dot composites under application of an electric field

Christine C. Kathrein, Christian Pester, Markus Ruppel, Maike Jung, Marc Zimmermann, Alexander Böker

Research output: Contribution to journalArticle

1 Scopus citations

Abstract

Time- and temperature-resolved in situ birefringence measurements were applied to analyze the effect of nanoparticles on the electric field-induced alignment of a microphase separated solution of poly(styrene)-block-poly(isoprene) in toluene. Through the incorporation of isoprene-confined CdSe quantum dots the reorientation behavior is altered. Particle loading lowers the order-disorder transition temperature, and increases the defect density, favoring nucleation and growth as an alignment mechanism over rotation of grains. The temperature dependent alteration in the reorientation mechanism is analyzed via a combination of birefringence and synchrotron SAXS. The detailed understanding of the effect of nanoparticles on the reorientation mechanism is an important prerequisite for optimization of electric-field-induced alignment of block copolymer/nanoparticle composites where the block copolymer guides the nanoparticle self-assembly into anisotropic structures.

Original languageEnglish (US)
Pages (from-to)8417-8424
Number of pages8
JournalSoft Matter
Volume12
Issue number40
DOIs
StatePublished - Jan 1 2016

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Condensed Matter Physics

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