Abstract
The conductivity and electron spin resonance (ESR) of polyaniline (PANI) – polymethylmethacrylate (PMMA) nanoscale blends have been studied. It has been found that the dependence of the specific volume conductivity on the PANI content in PANI-PMMA blends can be described by a percolation model with extremely low percolation “threshold” in the range 0.8–2% (vol.). The temperature dependence of ESR for the higher percolation threshold of a PANI- PMMA blend has been studied in the temperature range 4.2–300 K. It has been shown that a g-value for unblended PANI and the PANI-PMMA composites is close to the free spin value and is constant at all temperatures, while the spin population is temperature-depended. Based on the temperature dependence of ESR, the existence of two types of spins (localized and delocalized) in the polymer blend is suggested.
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