Compressibility of composite materials based on fibrous filler of various compositions

The compressibility of composite materials obtained by impregnation with water dispersion of polyurethane of webs made of polyethylene terephthalate fibers with a diameter of 20 µm and a mixture of these fibers with polyethylene terephthalate fibers with a diameter of 42 µm is investigated. The influence of the composition on the formation of the structure of canvases and composite materials based on them is shown. In the process of heat treatment, the volume of webs made of fibers with a diameter of 20 µm increases and decreases for webs based on a mixture of fibers of different diameters. Compared with canvases, with a degree of impregnation less than 1.0, the water permeability of materials of various compositions increases by 1.5 – 2.0 times. A model is proposed to predict the degree of compressibility of composite materials from the degree of impregnation and load. It is established that compressibility of composite materials decreases when using a web as a fibrous filler in which the fibers are oriented perpendicular to the surface of the web. Less effective for reducing compressibility is the use of a web made of a mixture of fibers of different diameters as a fibrous filler.