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Broadband Dielectric Spectroscopy Studies of Hyperbranched Polyglycerols

✍ Scribed by Abel Garcia-Bernabé; Ricardo Díaz-Calleja; Rainer Haag

Book ID
102489086
Publisher
John Wiley and Sons
Year
2006
Tongue
English
Weight
382 KB
Volume
207
Category
Article
ISSN
1022-1352

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✦ Synopsis

Abstract

Summary: The broadband dielectric spectroscopy of three hyperbranched polyglycerols with different molecular weights has been studied. All of the hyperbranched polyglycerols exhibited three relaxation processes, one related to glass transition (α relaxation) and two sub‐glass processes (β and γ relaxations). The relaxations were analyzed in terms of the Havriliak‐Negami equation. The two sub‐glass processes collapse with α relaxation in different scenarios at high temperatures and only a broad and apparently symmetric relaxation peak is observed. Within this temperature range, two clearly different tendencies were observed at the low and high extremes of the temperature range.
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