Dielectric spectroscopy of diglycidyl ether of bisphenol-A at glass transition temperature
Dielectric spectroscopy of diglycidyl ether of bisphenol-A at glass transition temperature作者机构：Department of Physics University of Sistan and Baluchestan Zahedan Iran
出 版 物：《Natural Science》 (自然科学期刊（英文）)
年 卷 期：2012年第4卷第2期
页 面：136-141页
主 题：Dielectric Relaxation Nano-Size Motion Secondary Relaxation Pressure and Temperature
摘 要：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.
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