1. Measuring structural inhomogeneity of a helical conjugated polymer at high pressure and temperature.
- Author
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Arge, Tummas Napoleon, Konôpková, Zuzana, Haase, Dörthe, Liermann, Hanns‐Peter, Scherf, Ullrich, Guha, Suchismita, and Knaapila, Matti
- Subjects
CONJUGATED polymers ,POLYFLUORENES ,PHASE transitions ,SOLIDIFICATION ,HIGH pressure measurements ,X-ray scattering - 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. © 2019 Wiley Periodicals, Inc. J. Polym. Sci., Part B: Polym. Phys. 2019, 57, 392–396 X‐ray scattering data from polyfluorene polymer is collected by mapping the sample with 10 μm spatial resolution from 0.3 GPa to 36 GPa. The structural inhomogeneity is characterized. The data are also collected with increasing temperature at 4.3 GPa. A phase transtion is identified at about 170°C. [ABSTRACT FROM AUTHOR]
- Published
- 2019
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