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

Arge, Tummas Napoleon ; Konôpková, Zuzana ; Haase, Dörthe LU ; Liermann, Hanns Peter ; Scherf, Ullrich ; Guha, Suchismita and Knaapila, Matti LU (2019) In Journal of Polymer Science, Part B: Polymer Physics 57(7). p.392-396
Abstract

We report on X-ray scattering measurements of helical poly[9,9-bis(2-ethylhexyl)-fluorene-2,7-diyl] by mapping the sample with 10 μm spatial resolution from 0.3 GPa to 36 GPa. We follow the strongest 00l 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 00l 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.

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author
; ; ; ; ; and
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
compression, conjugated polymers, high pressure measurements, polyfluorene, X-ray
in
Journal of Polymer Science, Part B: Polymer Physics
volume
57
issue
7
pages
392 - 396
publisher
John Wiley & Sons Inc.
external identifiers
  • scopus:85061370072
ISSN
0887-6266
DOI
10.1002/polb.24793
language
English
LU publication?
yes
id
714a780d-efca-469d-b38f-fd8b3de27317
date added to LUP
2019-02-22 10:02:00
date last changed
2023-10-06 21:49:36
@article{714a780d-efca-469d-b38f-fd8b3de27317,
  abstract     = {{<p>We report on X-ray scattering measurements of helical poly[9,9-bis(2-ethylhexyl)-fluorene-2,7-diyl] by mapping the sample with 10 μm spatial resolution from 0.3 GPa to 36 GPa. We follow the strongest 00l reflection, which moves toward higher scattering angles with pressure indicating planarization of helical polyfluorene. Lateral inhomogeneity is increased for &gt;10 GPa concomitant with the solidification of the pressure transmitting medium (a 4:1 mixture of methanol and ethanol). We also follow the 00l 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.</p>}},
  author       = {{Arge, Tummas Napoleon and Konôpková, Zuzana and Haase, Dörthe and Liermann, Hanns Peter and Scherf, Ullrich and Guha, Suchismita and Knaapila, Matti}},
  issn         = {{0887-6266}},
  keywords     = {{compression; conjugated polymers; high pressure measurements; polyfluorene; X-ray}},
  language     = {{eng}},
  month        = {{02}},
  number       = {{7}},
  pages        = {{392--396}},
  publisher    = {{John Wiley & Sons Inc.}},
  series       = {{Journal of Polymer Science, Part B: Polymer Physics}},
  title        = {{Measuring structural inhomogeneity of a helical conjugated polymer at high pressure and temperature}},
  url          = {{http://dx.doi.org/10.1002/polb.24793}},
  doi          = {{10.1002/polb.24793}},
  volume       = {{57}},
  year         = {{2019}},
}