This article is cited in 6 papers

Surface physics, thin films

Surface texture and percolation effects in microporous oriented films of polyolefins

D. V. Novikov^a, I. S. Kuryndin^b, V. Bukošek^c, G. K. Elyashevich<sup>b

a</sup> St. Petersburg State University of Telecommunications
^b Institute of Macromolecular Compounds, Russian Academy of Sciences, St. Petersburg
^c University of Ljubljana, Faculty for Natural Sciences and Engineering, Ljubljana, Slovenia

Abstract: The surface structure of polypropylene and polyethylene microporous films prepared by the extrusion of the polymer melt with the subsequent stages of annealing, uniaxial extension, and thermal fixation of the samples has been analyzed using scanning electron microscopy. It has been shown that percolation through pores corresponds to the axial texture of the surface with the channel structure described by the fractal cluster model. The transition from open pores (through-flow channels) to closed pores leads to the formation of surface regions with a biaxial texture. An increase in the density of the solid phase cluster is accompanied by the formation of a homogeneous biaxial texture with a period of alternation of the density in two mutually perpendicular directions, one of which coincides with the direction of orientation of the films.

Received: 10.04.2012

 English version: Physics of the Solid State, 2012, 54:11, 2312–2318

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