Beta phase in chiral polyfluorene forms via a precursor

G. Lakhwani, S.C.J. Meskers

Research output: Contribution to journalArticleAcademicpeer-review

19 Citations (Scopus)
4 Downloads (Pure)

Abstract

Chiral poly{9,9-bis[(3S)-3,7-dimethyloctyl]-2,7-fluorene) shows temperature-induced aggregation in 1-octanol. For polymer concentrations of > 0.01 mg/mL and cooling rates of = 10 °C/h, aggregates form, showing characteristics of the ß phase of polyfluorene. At higher cooling rates, lower concentration, or both, another type of aggregates forms (a), a and ß phases are distinguished by absorption, fluorescence, and circular dichroism (CD) spectroscopy. Temperature-dependent CD and dynamic light scattering show that the ß phase forms only via a precursor aggregate, whose formation is concentration-, temperature-, and time-dependent. The yield of the ß phase can be optimized by choosing processing conditions that favor the formation of the precursor.
Original languageEnglish
Pages (from-to)4220-4223
JournalMacromolecules
Volume42
Issue number12
DOIs
Publication statusPublished - 2009

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