Orientation Efforts as Regulatory Factor of Structure Formation in Permeable Porous Polyvinylidene fluoride Filmsстатья
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Дата последнего поиска статьи во внешних источниках: 11 мая 2022 г.
Аннотация:The manufacturing process of polyvinilidenfluoride microporous films containing through flow channels and permeable to liquids has been elaborated. The process is based on polymer melt extrusion with subsequent stages of annealing, uniaxial extensions (“cold” and “hot” drawing) and thermal stabilization. The effect of orientation parameters (melt draw ratio and extension degrees) on overall porosity, permeability, morphology and content of polar piezoactive β-phase in crystalline structure of the films is investigated by filtration porosimetry, sorptometry, scanning electron microscopy, X-ray scattering and mechanical properties measurements. It is shown that the through pores are formed by a percolation mechanism. It is observed that permeability and the β-phase content increase with the growth of extension degree at the pore formation stages but the portion of β-crystallites decreases with increasing of melt draw ratio at extrusion that permits to regulate the combination of through permeability and piezoactivity values by variation of the preparation process parameters.