Barra, Mario and Cassinese, Antonio and Guido, Stefano and Tomaiuolo, Giovanna (2007) An electric criterion to evaluate glass transition temperature dielectric relaxation measurements. [Pubblicazione in rivista scientifica]

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Item Type:	Pubblicazione in rivista scientifica
Lingua:	English
Title:	An electric criterion to evaluate glass transition temperature dielectric relaxation measurements
Creators:	Creators Email Barra, Mario UNSPECIFIED Cassinese, Antonio UNSPECIFIED Guido, Stefano UNSPECIFIED Tomaiuolo, Giovanna UNSPECIFIED
Autore/i:	P. D’Angelo , M. Barra, A. Cassinese, S. Guido, G. Tomaiuolo
Date:	2007
Number of Pages:	7
Department:	Scienze fisiche
Journal or Publication Title:	MACROMOLECULAR SYMPOSIA
Date:	2007
Volume:	247
Page Range:	pp. 43-49
Number of Pages:	7
Date Deposited:	20 Oct 2010 08:33
Last Modified:	30 Apr 2014 19:42
URI:	http://www.fedoa.unina.it/id/eprint/6629

Abstract

In this contribution, a dielectric measurement technique for the evaluation of phase transition temperature and the study of physical aging on polymeric thin films is considered. This kind of measurement provides the possibility of displaying phase transitions with a high degree of precision. Furthermore, it can be considered alternatively to techniques not applicable in the case of thin films, such as Differential Scanning Calorimetry (DSC). In this work, owing to the high sensitivity of the utilized experimental set-up, a glass transition TG of 156 K, with a precision equal to 0.3%, and a melting TM=220 K have been assessed for 4 micron thick Polydimethylsiloxane (PDMS) films. Performing measurement as a function of time, it was possible to monitor physical aging phenomena, mainly consisting in a change of dielectric properties. As expected, the time evolution of the aging phenomena can be described by a simple logarithmic law.

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