Negative dielectric permittivity of the Poly(acrylic acid) nanoporous sample

Spontaneously formed temperature-frequency zone of negative dielectric permittivity ’<0 was found in polymer–water system «PolyAcrylic Acid + 3 weight % of moisture». Nucleation and evolution of this zone is demonstrated on $\varepsilon′(f, T)$, $\varepsilon′′(f, T)$ and $\tg (f, T)$ 3D plots. The release of bound water at $T>65^{\circ}$C is thought to be the reason of this phenomenon. The frequency width of the zone steadily increases with temperature up to $T = 83^{\circ}$C, and then increases sharply from low–frequency side. This effect might be related to the anomalies in temperature dependencies of thermodepolarization currents in water at $T = 83^{\circ}$C. Spontaneous manifestation of $\varepsilon′ < 0$ phenomenon indicates that one can expect it in natural materials, including biopolymers, i. e. in living organisms.