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Dielectric spectroscopy of diglycidyl ether of bisphenol-A at glass transition temperature

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Author(s): Soheil Sharifi

Journal: Advances in Molecular Imaging
ISSN 2161-6728

Volume: 04;
Issue: 02;
Start page: 136;
Date: 2012;
Original page

Keywords: Dielectric Relaxation | Nano-Size Motion | Secondary Relaxation | Pressure and Temperature

ABSTRACT
We used broadband dielectric spectroscopy in the frequency range from 10–2 Hz up to 107 Hz and we found dynamics of the primary α- and intermolecular Johari-Goldstein (JG) β-processes are strongly correlated in diglycidyl ether of bisphenol-A over a wide temperature from 193 to 283K and pressure P range from 0.1 to 600 MPa. Analysing the temperature and pressure behavior of the α - and (JG) β-processes, a clear correlation has been found between the structural relaxation time, the Johari-Goldstein relaxation time and the dispersion of the structural relaxation. These results support the idea that the Johari-Goldstein relaxation acts as a precursor of the structural relaxation and therefore of the glass transition phenomenon.

Tango Jona
Tangokurs Rapperswil-Jona

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