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Dielectric study of local relaxations in dendritic macromolecules

Abstract : The aim of this work is to characterize the dielectric properties of amorphous dendritic macromolecules as a function of architectural complexity. By combining thermostimulated currents and dynamic dielectric spectroscopy, the dielectric permittivity has been obtained as a function of temperature, in a very broad frequency range (10−4–106 Hz). Generations g = 0 to g = 2 were investigated. The molecular origin of the quasi-Debye mode observed for g = 0 at low temperature is common to all generations: localized reorientations of aldehyde end groups. The interactions with the phosphorus/sulfur (P = S) dipoles are probably responsible for the broadening pointed out in upper generations.
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Eric Dantras, Anne-Marie Caminade, Jean-Pierre Majoral, Colette Lacabanne. Dielectric study of local relaxations in dendritic macromolecules. Journal of Physics D: Applied Physics, IOP Publishing, 2002, vol. 35 (n° 1), pp. 5-8. ⟨10.1088/0022-3727/35/1/302⟩. ⟨hal-01233429⟩



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