Measuring structural inhomogeneity of a helical conjugated polymer at high pressure and temperature |
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Authors: | Tummas Napoleon Arge Zuzana Konpkov Drthe Haase Hanns‐Peter Liermann Ullrich Scherf Suchismita Guha Matti Knaapila |
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Institution: | Tummas Napoleon Arge,Zuzana Konôpková,Dörthe Haase,Hanns‐Peter Liermann,Ullrich Scherf,Suchismita Guha,Matti Knaapila |
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Abstract: | We report on X‐ray scattering measurements of helical poly9,9‐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 |
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Keywords: | conjugated polymers compression X‐ray high pressure measurements polyfluorene |
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