Abstract
The ac conductivity (σac) and electric modulus (M′′) of polyisoprene (PI) with various molecular weights, 652 ≤ Mw ≤ 4,470, were analyzed. The scaling of both the σac 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 (σdc). The temperature dependence of σdc and the characteristic relaxation times, τc, verified Vogel–Fulcher–Tamman equations. Unlike the other studied samples, the PI samples with Mw = 1,370 and 4,470 exhibited non-decoupling between the α-relaxation time, τα, and σdc. The fractional Debye–Stokes–Einstein law was well verified for PI samples with Mw = 652, 790, 1,040 and 1,920.
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