The choice of adhesive for the production of yarn glue method

It is proposed to use sericin, a component of silkworm cocoons, as an adhesive compound for the production of yarn by the adhesive method. An experiment was conducted to study the dependence of the adhesion forces of the binder to cellulose on the concentration of the adhesive substance on the example of solutions of PVA, PVA and sericin. A comparative analysis of this dependence is carried out. Mathematical models are constructed to predict the strength of the adhesive joint depending on the concentration of the adhesive composition. The calculation of the adhesion forces per one elementary fiber is carried out.

Structural and physical characteristics of the yucca fiber

Yucca fiber is a natural cellulose fiber that can be extracted from the Yucca plant leaves by retting. The physical properties of the Yucca fiber are extremely sensitive to the retting conditions. This research was designed to study the effects of chemical retting on the structural and properties of this fiber. Chemical retting was done by soaking the Yucca leaf in 10 to 150 g/l sodium hydroxide concentration at 80 to 100 °C for 60 to 240 min. Fiber characteristics such as fineness, tenacity, functional groups, crystallinity, thermal degradation, and surface morphology were then investigated. The Yucca fibers exhibited high crystallinity (56–66%), high tenacity (36–46 cN/tex), and low linear density (3–5 tex). It was also found that the elementary fiber had a mean diameter of about 1.2 [Formula: see text] and a helical structure of square-shaped spires. The thermogravimetric analysis also indicated that the Yucca fiber had the thermal stability of up to 250 °C. Based on the findings, the Yucca fiber may be suitable for various applications such as a reinforcement material in the composites applications and can be turned to yarn for textile applications.

Coppering of fibrous materials based on polyacrylonitrile

Currently, the need to create new multifunctional materials that meet the requirements of technology and the needs of society has sharply increased. In addition, with the increase in the number of various "gadgets", communication systems, sources of electromagnetic "pollution" of the environment caused by the functioning of cellular communications, personal computers and other sources, protection against radiation and electromagnetic waves of the radio frequency range from 30 Hz to 3000 GHz becomes relevant. For these purposes, you can use modified fibers and fabrics by metallization. As the objects of study, we chose a woven material based on a polyacrylonitrile flagellum for special purposes (START LLC) with factory properties: nominal linear density of elementary fiber, 0.12 tex, specific tensile load of the fiber 450 mN/tex, elongation of the elementary fiber at break 18 % In the work, chemical copper plating was carried out in two ways: the first was a classical metallization scheme for plastics; the second method was carried out according to a new low-stage and low-component technology, which included two main stages: surface activation and chemical copper plating. The analysis of the surface of a fibrous material metallized by a galvanic method with preliminary chemical copper plating, both by traditional technology and by low-stage, showed that in two cases the coatings are uniform over the entire surface of the fibrous material and have a characteristic copper color, and metallic copper has a granular structure with a dense Packed grains to each other. At the same time, the electrical resistivity of PAN-fibrous materials is reduced. Metallization of woven materials based on PAN-fibrous materials in a low-component electrolyte using a low-stage chemical copper plating technology is promising, since the resulting coatings are characterized by high electrical properties, while reducing environmental stress due to the absence of harmful electrolyte components (acids during etching) and washing water.