PERCOLATION PHENOMENA AND ELECTRON SPIN RESONANCE IN NANOSCALE POLYANILINE-POLYMETHYLMETHACRYLATE BLENDS

Aksimentyeva O.I. та Konopelnyk O.I. та Yurkiv V. та Martyniuk G.V. та Shapovalov V. (2014) PERCOLATION PHENOMENA AND ELECTRON SPIN RESONANCE IN NANOSCALE POLYANILINE-POLYMETHYLMETHACRYLATE BLENDS. Molecular Crystals and Liquid Crystals (468). с. 309-316. ISSN 1542-1406

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Анотація

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 temperaturedepended. 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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