Porous Permeable Polymers

Features of extrusion for mixtures of polyvinyl chloride and a pore-forming agent with the aim of preparing very porous materials are studied. It is shown that extrusion rate depends on the particle size of the pore-forming agent with the same volume content. This is explained by the difference in the structure of mixtures with respect to pore-forming agent. Marked anisotropy is established for the porous structure of materials in the extrusion direction and perpendicular to it. The hydraulic and mechanical properties of porous materials are determined and possible fields for their application (aeration in fish breeding, capillary transport for under-root irrigation, etc.) are suggested.