The manufacturing process of poly(vinylidene fluoride) 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 was investigated by filtration porosimetry, sorptometry, scanning electron microscopy, X-ray scattering, and mechanical properties measurements. It is shown that the through pores were formed by a percolation mechanism. It is observed that permeability and the β-phase content increased with the growth of extension degree at the pore formation stages but the portion of β-crystallites decreased with increasing melt draw ratio at extrusion, which permitted to regulate the combination of through permeability and piezoactivity values by variation of the preparation process parameters.

已经阐明了包含通过流动通道并且可渗透液体的聚偏二氟乙烯微孔膜的制造工艺。该工艺基于聚合物熔体挤出以及随后的退火，单轴延伸（“冷”和“热”拉伸）和热稳定化阶段。通过过滤孔隙率法，吸湿法，扫描电子显微镜，X射线研究了取向参数（熔体拉伸比和延伸度）对膜的整体孔隙率，渗透率，形貌以及极性压电活性β相含量的影响。散射和机械性能测量。结果表明，通孔是通过渗流机制形成的。观察到渗透率和β相含量在成孔阶段随着延伸程度的增加而增加，但β微晶的部分随着挤出时熔体拉伸比的增加而减少，这允许通过改变制备工艺参数来调节通透性和压电活性值的组合。 。