Measuring structural inhomogeneity of a helical conjugated polymer at high pressure and temperature

Tummas Napoleon Arge, Zuzana Konôpková, Dörthe Haase, Hanns-Peter Liermann, Ullrich Scherf, Suchismita Guha, Matti Knaapila*

*Corresponding author for this work

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We report on X-ray scattering measurements of helical poly[9,9-bis(2-ethylhexyl)-fluorene-2,7-diyl] by mapping the sample with 10μm spatial resolution from 0.3 GPa to 36 GPa. We follow the strongest 00/reflection, which moves toward higher scattering angles with pressure indicating planarization of helical polyfluorene. Lateral inhomogeneity is increased for >10 GPa concomitant with the solidification of the pressure transmitting medium (a 4:1 mixture of methanol and ethanol). We also follow the 00/reflection with increasing temperature at the constant pressure of 4.3 GPa in neon. We observe a sharp shift toward higher scattering angles indicative of a phase transition at 167–176 °C.
Original languageEnglish
JournalJournal of Polymer Science. Part B, Polymer Physics
Issue number7
Pages (from-to)392-396
Number of pages5
Publication statusPublished - 2019


  • Conjugated polymers
  • Compression
  • X-ray
  • High pressure measurements
  • Polyfluorene

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