Journal article
Measuring structural inhomogeneity of a helical conjugated polymer at high pressure and temperature
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.
Language: | English |
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Year: | 2019 |
Pages: | 392-396 |
ISSN: | 10990488 and 08876266 |
Types: | Journal article |
DOI: | 10.1002/polb.24793 |
ORCIDs: | Knaapila, Matti , 0000-0001-5358-2954 , 0000-0001-5039-1183 , 0000-0001-8368-4919 and 0000-0002-6269-2298 |