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Updated: Aug 23, 2026

Synthesis of Cyclic Polymers and Characterization of Their Diffusive Motion in the Melt State at the Single Molecule Level
Published on: September 26, 2016
Molecular dynamics of oligofluorenes: a dielectric spectroscopy investigation
P Papadopoulos1, G Floudas, C Chi
1Department of Physics, University of Ioannina, P.O. Box 1186, 451 10 Ioannina, GreeceFoundation for Research and Technology-Hellas (FO.R.T.H.), Biomedical Research Institute (FORTH/BRI), Ioannina, Greece.
Abstract:
The molecular dynamics were investigated in a series of "defect-free" oligofluorenes up to the polymer by dielectric spectroscopy (DS). The method is very sensitive to the presence of keto "defects" that when incorporated on the backbone give rise to poor optical and electronic properties. Two dielectrically active processes were found (beta and alpha process). The latter process (alpha) displays strongly temperature dependent relaxation times and temperature- and molecular weight-dependent spectral broadening associated with intramolecular correlations. The glass temperature (Tg) obeys the Fox-Flory equation and the polymer Tg is obtained by DS at 332 K. The effective dipole moment associated with the alpha process is 0.27 +/- 0.03 D.
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