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Polymer Bulletin

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01-08-2014 | Original Paper

Charge transport and glassy dynamics in polyisoprene

Authors: A. Abou Elfadl, S. El-Sayed, A. Hassen, F. H. Abd El-Kader, G. Said

Published in: Polymer Bulletin | Issue 8/2014

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Abstract

The ac conductivity (σ _ac) and electric modulus (M′′) of polyisoprene (PI) with various molecular weights, 652 ≤ M _w ≤ 4,470, were analyzed. The scaling of both the σ _ac and M′′ data suggested that the investigated PI samples follow a temperature-independent conductivity distribution relaxation mechanism. An intense peak was observed in M′′(f) and attributed to the dc conductivity (σ _dc). The temperature dependence of σ _dc and the characteristic relaxation times, τ _c, verified Vogel–Fulcher–Tamman equations. Unlike the other studied samples, the PI samples with M _w = 1,370 and 4,470 exhibited non-decoupling between the α-relaxation time, τ _α, and σ _dc. The fractional Debye–Stokes–Einstein law was well verified for PI samples with M _w = 652, 790, 1,040 and 1,920.

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Title: Charge transport and glassy dynamics in polyisoprene
Authors: A. Abou Elfadl
S. El-Sayed
A. Hassen
F. H. Abd El-Kader
G. Said
Publication date: 01-08-2014
Publisher: Springer Berlin Heidelberg
Published in: Polymer Bulletin / Issue 8/2014
Print ISSN: 0170-0839
Electronic ISSN: 1436-2449
DOI: https://doi.org/10.1007/s00289-014-1170-x

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