Analysis of decoupling of DC conductivity and structural relaxation time in epoxies with different molecular topology

T. Psurek, J. Ziolo and M. Paluch

Physica A: Statistical Mechanics and its Applications, 2004, vol. 331, issue 3, 353-364

Abstract: Dielectric measurements of 4,4′-methylenebis (N,N-diglicydilaniline) (MBDGA) have been carried out along both pressure and temperature pathways. The phenomenon of decoupling between the DC-conductivity and the structural (α-) relaxation time has been studied. We found that the exponent s in the fractional Debye–Stokes–Einstein relation is both temperature and pressure independent, and its value can be determined from the ratio of activation volumes for the DC-conductivity relaxation and the structural relaxation process, respectively. The results for MBDGA have been compared with results previously obtained for similar epoxies, i.e., N,N-diglycidylaniline and N,N-diglycidyl-4-glycidyloxyaniline. A correlation between the molecular size and the fractional exponent has been established.

Keywords: Supercooled liquid; Glass transition; Dielectric spectroscopy; High pressure; Dc-conductivity; α-relaxation process (search for similar items in EconPapers)
Date: 2004
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Persistent link: https://EconPapers.repec.org/RePEc:eee:phsmap:v:331:y:2004:i:3:p:353-364

DOI: 10.1016/j.physa.2003.09.033

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