Abstract:
The density microfluctuations $\delta\rho$ on the surface of thin films obtained from solutions of various concentrations $c$ of high molecular weight atactic polystyrene in chloroform have been studied by electron microscopy. It is shown that the value of $\delta\rho$ and the dielectric properties of films – the dielectric permittivity $\varepsilon$, as well as the dielectric loss angle tangent $\operatorname{tg}\Delta$ change nonmonotonously on the scale of parameter $c$. The minimum $\varepsilon$ and maximum $\operatorname{tg}\Delta$ correspond to a sharp surge in microfluctuations and fractalization of the supermolecular structure of the polymer. The discovered correlations of the “microstructure-properties” type are explained by structural transitions during film formation – aggregation of macromolecules and self-organization of particle aggregates.
Keywords:thin polymer films, electron microscopy, density microfluctuations, fractal structure, structural transitions.
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