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TSC and Broadband Dielectric Spectroscopy Studies of the α Relaxation in Phosphorus-Containing Dendrimers

Dantras, Eric and Dandurand, Jany and Lacabanne, Colette and Caminade, Anne-Marie and Majoral, Jean-Pierre TSC and Broadband Dielectric Spectroscopy Studies of the α Relaxation in Phosphorus-Containing Dendrimers. (2004) Macromolecules, 37 (8). 2812-2816. ISSN 0024-9297

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Official URL: http://dx.doi.org/10.1021/ma049955i

Abstract

The aim of this work is to analyze the dielectric manifestation of the glass transition (R mode) of amorphous dendritic macromolecules as a function of architectural complexity. A set of phosphorus-containing dendrimers involving six generations (g ) 0-5) has been investigated by thermostimulated currents and broadband dielectric spectroscopy. The dielectric complex permittivity has been obtained as a function of temperature, in a broad frequency range (10-4-106 Hz). For frequencies higher than 1 Hz, the dendrimers show a high temperature R mode with a Vogel-Tamman-Fulcher type temperature dependence. For frequencies lower than 1 Hz, the R mode takes place in the vitreous state; it has been associated with a series of thermally activated cooperative movements free from generation influence. Dielectric and thermal properties are discussed as regards of fractal architecture and chemical modification of end groups.

Item Type:Article
Additional Information:Thanks to American Chemical Society editor. The definitive version is available at The original PDF of the article can be found at Molecules website :
HAL Id:hal-01308058
Audience (journal):International peer-reviewed journal
Uncontrolled Keywords:
Institution:French research institutions > Centre National de la Recherche Scientifique - CNRS (FRANCE)
Université de Toulouse > Institut National Polytechnique de Toulouse - INPT (FRANCE)
Université de Toulouse > Université Toulouse III - Paul Sabatier - UPS (FRANCE)
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Deposited By: cirimat webmestre
Deposited On:06 Oct 2015 13:39

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