Authors Tsuwi, J. ; Pospiech, D. ; Jehnichen, D. ; Häußler, L. ; Kremer, F.
Title Molecular dynamics in semifluorinated-side-chain polysulfone studied by broadband dielectric spectroscopy
Date 31.05.2007
Abstract The molecular dynamics of a set of polysulfone polymers have been studied with broadband dielectric spectroscopy. The materials comprise main-chain polysulfones attached to semifluorinated (SF) oxydecylperfluorodecyl side chains. Through the analysis of the dielectric data together with information from differential scanning calorimetry and small-angle X-ray scattering, it can be shown that the oxydecylperfluorodecyl side chains are microphase-separated and form nanodomains with an independent dynamic glass-transition (SF) relaxation. In addition to the process (which is the glass transition of the main chain), other relaxation processes can be detected with Arrhenius-type activation energies of 38-90 ± 2 kJ/mol. A SF process, observed only in polysulfone with SF side chains, can be assigned to librational fluctuations of the perpendicular component of the fluoroalkyl group. A B relaxation reflects fluctuations of the dipole moments (OSO and CO) of the polymer, whereas a process, with high activation energies (>70 ± 2 kJ/mol), is assigned to packaging defects in the material. A detailed description of the processes is provided together with a proposed relaxation scheme. © 2007 Wiley Periodicals, Inc. J Appl Polym Sci 105: 201-207, 2007
Journal Journal of Applied Polymer Science 105 (2007) 201-207

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