Fractal aggregates of polyfluorene-polyaniline triblock copolymer in solution state

Matti Knaapila, Vasil M. Garamus, László Almásy, Jing S. Pang, Michael Forster, Andrea Gutacker, Ullrich Scherf, Andrew P. Monkman

Research output: Contribution to journalArticle

11 Citations (Scopus)

Abstract

We report on the aggregate structure of a symmetrical A-B-A 9,9-dialkylfluorene/2-alkylaniline "coil-rod-coil" triblock copolymer (or PF/PANI11112-b-PANI11)-consisting of 2-dodecylanilines as A blocks and 9,9-di(3,7,11-trimethyldodecyl)fluorene)s as B blocks-mixed in deuterated toluene, chloroform, and methylcy-clohexane. These mixtures contain micrometer scale aggregates. Small-angle neutron scattering data indicate that the interface between the aggregates and solvents manifests surface fractal-like structure. The upper and lower limit length scales which show fractal character are of the order of > 100 and 15 nm. The surface fractal dimension D s varies from 2.2 to 2.8. The data show that stiff polyfluorene (PF) segments (persistence length ≥9.5 nm, diameter ~ 2 nm) of PF/PANI11112-b-PANI11 are dissolved down to the molecular level. Photoluminescence data indicate that most PF units are isolated from both polyaniline (PANi) units and each others. Together with the scattering data, this implies that the disordered interface consists of stiff isolated PF blocks linked together via domains of associated PANi blocks.

Original languageEnglish
Pages (from-to)16415-16421
Number of pages7
JournalJournal of Physical Chemistry B
Volume112
Issue number51
DOIs
Publication statusPublished - Dec 25 2008

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Surfaces, Coatings and Films
  • Materials Chemistry

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  • Cite this

    Knaapila, M., Garamus, V. M., Almásy, L., Pang, J. S., Forster, M., Gutacker, A., Scherf, U., & Monkman, A. P. (2008). Fractal aggregates of polyfluorene-polyaniline triblock copolymer in solution state. Journal of Physical Chemistry B, 112(51), 16415-16421. https://doi.org/10.1021/jp806763d