Molecular weight effect on the formation of β phase poly(9,9′-dioctylfluorene) in dilute solutions

Craig W. Cone, Ryan R. Cheng, Dmitrii E. Makarov, David A. Vanden Bout

Research output: Contribution to journalArticlepeer-review

36 Scopus citations

Abstract

The effect of molecular weight on the formation of β phase poly(9,9-dioctylfluorene) (PF8) was studied in dilute solutions. Temperature-dependent fluorescence experiments of unique synthetic batches as well as size-excluded single batches of polyflourene were studied. Each batch had unique molecular weight, tetrahedral defect concentration, and polydispersity index (PDI). Polyflourene was found to exhibit a temperature-dependent transition between two phases with distinct electronic transition signatures: the α (primary) phase and the β (secondary) phase. In dilute solutions, the temperature at which the polymer exhibited a conversion between these phases showed a clear dependence on molecular weight. We model this transition temperature for β phase formation using the mean field theory for the coil-globule transition developed by Isaac Sanchez. Results show that temperature affects the average end-to-end distance corresponding to increases in secondary electronic absorption and that the dependence on temperature related to the coil-globule transition.

Original languageEnglish
Pages (from-to)12380-12385
Number of pages6
JournalJournal of Physical Chemistry B
Volume115
Issue number43
DOIs
StatePublished - Nov 3 2011

ASJC Scopus subject areas

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

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