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Zorn, R., Arbe, A., Colmenero, J., Frick, B., Richter, D. and Buchenau, U. (1995) Neutron scattering study of the picosecond dynamics of polybutadiene and polyisoprene. Physical Review E, 52, 781-795. doi:10.1103/PhysRevE.52.781

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

  AUTHORS: Soheil Sharifi

  KEYWORDS: Dielectric Relaxation; Nano-Size Motion; Secondary Relaxation; Pressure and Temperature

  JOURNAL NAME: Natural Science, Vol.4 No.2, February 22, 2012

  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.