E. S. Bokova

Electrospun Fibrous Materials Made of Collagen and Chitin Derivatives

Spinning of nano- and microfibers from solutions of collagen hydrolysate, dibutyrylchitin, and their mixtures was studied under various conditions. Various electrospinning methods (electrocapillary, electrocentrifugal, Nanospider™) were compared and analyzed. Promising applications of non-woven materials in medicine and health and for clothing and shoe production were demonstrated.

Targeted Control of the Structure Formation Process in Production of New Synthetic Leathers

We have conducted systematic studies and provided a scientific basis for approaches to development of polyester urethane synthetic leathers based on a nonwoven base fabric, obtained by electrocapillary spinning. We propose a modified technology allowing us, with no additional costs or any increased environmental risks, to expand the range of competitive synthetic leathers with a heteroporous type of porous structure, leather-like organoleptic properties, and good performance parameters.

Use of water-soluble polymers for electrospinning processing

Ultra-thin fibers based on polyvinyl alcohol, polyacrylic acid, and their mixed composites were prepared. The principal characteristics of the solutions and parameters of a stable electrospinning process for fibers and nanofibrous materials were found.

Mechanical and structural characteristics of needle-punched materials with the use of different needles

The feasibility of partially or completely replacing imported needles by Russian-made needles is studied. Different needles and combinations of needles were used for the stage in which additional punching is performed. It is shown that Russian-made needles can partially take the place of imported needles, but such a substitution will require closer monitoring of the depth of needle penetration.

Electrospinning of fibrous materials from modified polyurethane solutions

The effects of spinning solution parameters on electrospinning of fibrous and nanofibrous materials from polyurethane solutions were studied.

Electrospinning as Promising Technology for Expanding the Assortment of Fibre-Reinforced Porous Composite Materials and Coatings

Scientific approaches and technological solutions for obtaining fibre-reinforced porous composite materials using the electrospinning method are proposed. A comparative analysis of the methods of electrospinning (electrocapillary and NanospiderTM method) is proposed along with a formulation and technological parameters for electrospinning various polymer systems, including solutions of polyamide, polyvinyl alcohol, polyethylene oxide, and interpolymer complexes. Promising opportunities for application of nonwoven fabrics and fibre-reinforced porous composites in medicine, sanitary hygiene, and for the production of clothing, footwear and packaging materials are shown.

Effect of Fibrous-Porous Composite Composition on its Radiophysical Characteristics

A multilayer fibrous-porous composite based on a non-woven fabric and a protective-decorative coating modified by carbon fibers was produced. The frequency dependence of the reflection coefficient for SHF electromagnetic radiation was studied as a function of the composition of the radio-absorbing material layers.

Electrospinning of Fibrous Materials from Solutions of Functionally Active Water-Soluble Polymers

It was shown that interpolymer complexes could be used as spinning compositions for electrospinning on needle-free Nanospider™ equipment of fibers and non-woven materials. The influence of the solution characteristics and fiber-spinning parameters on the structure and properties of the non-woven materials was found.

Production of Nonwoven Needlepunched Material With Increased Stretch Resistance

We have studied the stretch resistance of needlepunched web with bicomponent fibers, as a function of processing conditions. We propose a mechanism for stretching of the web and provide a rationale for a processing method. We consider the major processing methods and perform a comparative analysis of their effectiveness. Stretch resistance depends on the combination of temperature and processing speed, and to a large extent the effectiveness of processing is determined by its speed.

Predicting the strength of high-density needle-punched nonwovens

A study is made of the use of a model developed to predict the strength of materials after basic needle-punching and additional needle-punching. With a limit on surface density, the model adequately describes the effect of the structure of the material on its strength in the case of high needle density. The additional needle-punching increases strength in the longitudinal direction without changing the transverse strength achieved during the main needle-punching stage.