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Dielectric Spectroscopy of PVAc at Different Isobaric-Isothermal Paths
Department of Physics, University of Sistan and Baluchestan, Zahedan, Iran
- 1 Department of Physics, University of Sistan and Baluchestan, Zahedan, Iran
Materials Sciences and Applications·Volume 03 (2012)·Pages 168–172·Published 23 March 2012·DOI10.4236/msa.2012.33026
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Abstract
We studied broadband dielectric spectroscopy of a glass from systems that the dynamics of the primary α- and the Johari-Goldstein (JG) β- processes are strongly correlated in Poly(vinyl acetate) over a wide temperature T and pressure P range. Analysing the temperature and pressure behaviour of the α- and (Non-JG) β- processes, a correlation hasnot been found between the structural relaxation time, the (Non-JG) β- processes relaxation time and the dispersion of the structural relaxation. These results support the idea that the (JG)-processes relaxation acts as a precursor of the structural relaxation and therefore of the glass transition phenomenon but it isnot clear relation in the (Non-JG) β- processes and structural relaxation at PVAc.
KeywordsDielectric RelaxationNan-Size MotionPressure and Temperature
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