Dielectric study of local relaxations in dendritic macromolecules

Eric Dantras (1) , Anne-Marie Caminade (2) , Jean Pierre Majoral (2) , Colette Lacabanne (1)

1 CIRIMAT - Centre interuniversitaire de recherche et d'ingenierie des matériaux
2 LCC - Laboratoire de chimie de coordination

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.

Mots clés: Dielectric; Dendritic macromolecules

Domaines: Chimie de coordination; Matériaux; Chimie-Physique [physics.chem-ph]

Eric Dantras, Anne-Marie Caminade, Jean Pierre Majoral, Colette Lacabanne. Dielectric study of local relaxations in dendritic macromolecules. Journal of Physics D: Applied Physics, 2002, vol. 35 (n° 1), pp. 5-8. ⟨10.1088/0022-3727/35/1/302⟩. ⟨hal-01233429⟩