Polymer Science, Series D最新文献

By means of the thermochemical method of wood modification it is possible to achieve a comprehensive improvement of wood properties—to significantly increase its strength properties and hygroscopicity. During deep and through impregnation with a colored solution, wood is colored due to the solution moving inside the wood through the cavities of cells having a tubular structure. Having penetrated inside the wood through the capillaries of vessels, tracheids and medullary rays, the dye colors the cell walls, diffusing into their intercapillary spaces. In this case, the cell walls are colored more intensively than the cell cavities. The increase in the strength of modified wood is explained by insufficient water adsorption due to a decrease in the diameter of tracheids filled with the modifier solution; apparently, this is also associated with a decrease in the contact area with water of the glue–wood boundary layer due to a decrease in the size of the cell cavities. The shear strength along the fibers corresponds to the European standard EN205 D4. The increase in water resistance of modified wood is due to the fact that urea compacts the wood and gives it increased dimensional stability.

In this paper, the application possibilities of new polymer flame retardants as combustion inhibitors for some commercial polymers, such as polymethyl methacrylate, plastic ABS, and ED-20 epoxy resin were considered. Some regularities in the fireproofing of commercial polymers were revealed.

Data available from the literature concerning the use of cereal straw (barley, corn, oat one, etc.) as a sorption material for eliminating hydrocarbon spills from water surfaces are summarized. Brief information on the composition of straw and on the amounts of its formation is presented. It is shown that cereal straw is a common, multitonnage, and rather efficient and cheap sorption material for removing oil and the products of its processing from water surfaces. It is shown that the sorption characteristics of straw with respect to oil and the products of its processing can be improved through straw modification with the use of various chemical reagents and physicochemical methods.

Continuation of research on the topic indicated in the title of this article, the results of which have already been published, is aimed at indicating additional technological features of manufacture of an adhesive composition based on a blocked polyisocyanate, which will help to accelerate the organization of its production, as well as the rubber–metal product as a whole.

Ethylene–propylene copolymers are known for a wide range of valuable properties. Rubbers based on them, possessing weather resistance, resistance to aggressive environments and a wide temperature range of operation, are in demand in the production of open-cell elastomer materials (OCEMs). The complex of operational properties of OCEMs is determined by the morphological structure of the material. This paper presents a comparative analysis of the technologies of single- and two-stage methods for producing OCEMs based on ethylene–propylene–diene copolymer in vulcanization presses from the position of regulating its porous structure.

The article reviews and systematizes information sources in the field of creating sticky adhesives based on acrylates—hot-melt pressure-sensitive adhesives, including aqueous acrylic dispersions and UV‑curables, and self-adhesive materials based on them, intended for use in various fields of technology. The article presents the results of domestic and foreign studies aimed at finding ways to modify the composition of sticky adhesives in order to improve their adhesive, cohesive and technological properties in the composition of self-adhesive materials. The article presents the results of studies on methods for activating the surface of self-adhesive material substrates in order to improve the adhesive properties of sticky adhesive. Examples of practical application of adhesive tapes based on pressure-sensitive adhesives and self-adhesive materials based on them are presented.

For the first time, binders have been developed for creating composite materials by contact molding, including ED-20 epoxy resin and triethylenetetramine modified with thermoplastic polyurethane. For cured binders, compared to an unmodified sample, the abrasion resistance index increases by 2.3 arb. units. Glass-reinforced plastics manufactured using the developed binders are characterized by increased values of bending stress at maximum load and elastic modulus up to 522 MPa and 16.0 GPa, respectively.

Planning of a multifactor experiment to study the influence of the technological mode of ultrajet modification on the electrical conductivity of the final composite material was carried out. The purpose of this experiment is to obtain data for constructing a mathematical model of the technological process of nanomodification and to determine the optimal parameters of the nanomodification mode.

In this paper, the results of determining the principal kinetic and physicochemical regularities of the formation of polymer flame retardants and the thermal characteristics of the target product are presented. The relation between the physicochemical properties of polymers and their flammability and cookability is revealed.

This work presents the results of studies of the characteristics of polycyanurate of the Primaset PT-30 brand, as well as a developed cyanate epoxy composition based on it, used as a polymer matrix in carbon prepregs applied for fabrication of composite structures with high thermomechanical characteristics for aerospace engineering.