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Journal articles
TSC and Broadband Dielectric Spectroscopy Studies of the α Relaxation in Phosphorus-Containing Dendrimers
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.
Cited literature [9 references]
https://hal.archives-ouvertes.fr/hal-01308058
Contributor : Open Archive Toulouse Archive Ouverte (oatao) <>
Submitted on : Wednesday, April 27, 2016 - 11:00:43 AM
Last modification on : Friday, November 6, 2020 - 11:56:12 AM
Long-term archiving on: : Thursday, July 28, 2016 - 10:23:43 AM
Contributor : Open Archive Toulouse Archive Ouverte (oatao) <>
Submitted on : Wednesday, April 27, 2016 - 11:00:43 AM
Last modification on : Friday, November 6, 2020 - 11:56:12 AM
Long-term archiving on: : Thursday, July 28, 2016 - 10:23:43 AM
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