Polymer Science, Series D最新文献

Copolyarylene ether ketones based on a mixture of bisphenols 1,1-dichloro-2,2-di(4-oxyphenyl)ethylene and 1,1-dichloro-2,2-di(3,5-dibromo-4-hydroxyphenyl)ethylene with 4,4'-dichlorodiphenylketone have been obtained by high-temperature polycondensation in an aprotic dipolar solvent of N,N-dimethylacetamide. The structure and structure of the synthesized copolymers have been studied using the methods of X-ray diffraction analysis, IR spectroscopy, and turbidimetric titration. Basic physical and mechanical properties have been studied, which confirmed that these copolyarylene ether ketones can be used as highly heat-resistant structural polymer materials.

The problems of obtaining cellulose suitable for regeneration (cellulose for chemical processing) have been described. A variety of pretreatment techniques are used to activate cellulose. Manmade fibers from regenerated cellulose are produced by wet and wet air-gap spinning. The processes of production of viscose cellulose and copper–ammonia cellulose, as well as the Lyocell process, are used that are based on N-methylmorpholine-N-oxide and ionic liquids.

The production of paper–polymer composite materials based on polystyrene and plant extracts of coniferous trees is described. The resulting bioplastics have increased resistance to biodegradation and are a promising basis for use as reinforcing polymer systems of cellulose-containing materials used for the production of packaging materials and special-purpose papers as part of electrical devices for various purposes. It has been shown that the inclusion of plant extracts makes it possible to improve the physical and mechanical properties of paper composites and ensure their resistance to biocorrosion. The conducted research makes it possible to expand the areas of application of paper materials and products based on them.

In the work, the influence of the content of hydrocarbon resins on physicomechanical and adhesive properties of hot-melt adhesives based on polyisobutylene has been studied. Hydrocarbon resins of Hikorez A1100S and Hikorez R1100S grade were used as research objects, which were introduced into a composition consisting of polyisobutylene of SDG-8450 grade, styrene–ethylene–butylene–styrene rubber of Globalprene 9557 grade, and ethylene–vinyl acetate copolymer of 11306-075 grade. An increase in the resin content leads to a slight decrease in the strength of the compositions and an increase in relative elongation. In addition, studied resins effectively increase the adhesion of the composition to a Mylar film. The stickiness of the composition decreases with increasing resin content.

The stages of development of adhesive polyvinyl chloride plastisols at the Research Institute of Polymers in 1970–1990 are considered, as well as modern developments to increase the adhesive strength of polyvinyl chloride plastisols.

In this work, based on an analysis of the structure–property relationship, stabilizing components have been selected that can effectively participate in the suppression of certain destructive processes in polymers.

Data on the use of bark of coniferous and deciduous trees as a sorption material to extract hydrocarbons from aqueous media are summarized. It was shown that tree bark is an effective, widespread, and cheap sorption material to remove petroleum and its products from the water surface. It was also shown that the sorption characteristics of tree bark for petroleum and its processing products can be increased via modification with various chemical reagents. It was found that most publications are devoted to study the bark of coniferous trees as oil sorbents, most of all the bark of Pinus sylvestris. The limited number of publications on the use of deciduous tree bark as petroleum sorbents makes this area promising.

A method is proposed for estimating the contact angle of fibrous materials by optical analysis of the meniscus formed due to capillary forces when the sample is immersed in a liquid. The contact angles of wetting of carbon fibers in an epoxy binder at the gelation temperature were assessed. The content of the sizing composition in the studied samples was determined using DSC/TG analysis and the data obtained were correlated with the dynamics of changes in the contact angle. The features of the experiment are shown, and the advantages and disadvantages of the proposed measurement method are considered.

The article presents research on the use of modified amino-formaldehyde resins in the manufacture of decorative paper laminates.

The article discusses the problem of determining the rheological parameters of polymers from stress relaxation curves using the CatBoost machine learning algorithm. The model is trained on theoretical curves constructed using the nonlinear Maxwell–Gurevich equation. Comparisons are made with other methods, including the classical algorithm, nonlinear optimization methods, and artificial neural networks.