Abstract
Polyvinylidene f luoride porous films containing through channels have been prepared for the first time. The films have been obtained via melt extrusion followed by annealing, uniaxial extension, and thermal fixation. Uniaxial extension has been carried out in two stages (“cold” and “hot” drawing) at room and elevated temperature, respectively. The effect of orientation efforts during formation of the porous structure of films on the overall porosity, permeability for liquids, the content of piezoactive β- phase in the crystalline part of sample, and piezo modulus d31 has been studied. The formation of through channels occurs via a percolation mechanism at the overall porosity of 23%. Under uniaxial extension of films, the pore formation competes with the polymorphic α → β transition. The conditions of porous film preparation allowing one to attain the maximum through permeability and piezo modulus values have been determined.
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Original Russian Text © G.K. Elyashevich, I.S. Kuryndin, V.K. Lavrentyev, I.Yu. Dmitriev, 2018, published in Vysokomolekulyarnye Soedineniya, Seriya A, 2018, Vol. 60, No. 6, pp. 452–460.
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Elyashevich, G.K., Kuryndin, I.S., Lavrentyev, V.K. et al. Through Permeability of Polyvinylidene Fluoride Piezoactive Porous Films. Polym. Sci. Ser. A 60, 734–741 (2018). https://doi.org/10.1134/S0965545X18060032
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DOI: https://doi.org/10.1134/S0965545X18060032