Polymer Science, Series D最新文献

The paper examines the technology for synthesizing phenol and formaldehyde resin grade SFZh-3011 modified with fusel oil fraction (a mixture of alcohols) introduced in amounts ranging from 1 to 7% of the total reaction mass. The strength of the adhesive bond and the adhesive ability of the modified resins were evaluated, as well as the impact of the modified binder on the physical and mechanical properties of wood chipboards.

The use of fibers from polylactic acid (PLA) to create nonwoven materials and threads is relevant. A study of the microstructure and properties of PLA threads was carried out, followed by comparison with polyamide ones. It has been established that PLA threads are bundles of monofilaments with a diameter of 14 ± 1 μm made of PLA with a high degree of crystallinity (up to 60%), which determines high tensile strength (90–95 MPa). PLA threads are characterized by shrinking up to 8% when heated above the glass transition temperature.

The properties of oligomeric unsaturated polyketones with different oxygen contents have been studied. The compatibility of unsaturated polyketones with epoxy oligomers has been studied. It has been shown that curing of unsaturated polyketones is possible using quinol ether and dinitrile oxides. Liner compositions based on unsaturated polyketones and epoxy oligomers have been produced for bonding highly filled polymer compositions with a rigid multilayer substrate. The physicochemical and physical–mechanical characteristics of the produced polymer materials have been studied.

The results of studies on the effect of fillers—calcium carbonate of the MTD-2 and Omyakarb 3T brands—on the physical and mechanical properties as well as viscosity of uncured sealants based on low-molecular-weight polyethylene are presented. The optimum composition of the sealing composition is found. The composition of the sealing material is safe upon contact with human skin, which makes it possible to manually apply it when assembling structures. Sealants of such a type are applied for temporary sealing upon assembling structures in mechanical engineering and in the production of chilling equipment.

The values of the fiber-matrix adhesive strength are presented, as well as electron microscopic data on the microstructure of the polymer matrix and interfacial layer for fiberglass in the initial state and after exposure to various climatic factors. The most significant drop in adhesive strength was observed for the sample after heat and humidity aging and subsequent thermal cycling.

The change in the surface morphology of polyketone, polypyromeltitimide, polyethylene naphthalate, and polyethylene terephthalate films under the influence of a direct current discharge has been studied. A significant increase in the roughness has been shown, which is more characteristic of films modified at the cathode. The adhesion properties (peel resistance) have been assessed using the T-test method according to ASTM1876-2001 with polyurethane glue. A significant increase in adhesion for the modified samples has been shown. The contribution of changes in surface morphology to the manifestation of this effect is discussed.

New hybrid epoxyurethane adhesive compositions for attaching cast polyether urethane to the surface of AMg6 aluminum alloy are presented. Polyetherurethane elastomers and adhesive compounds based on them were manufactured using new adhesive epoxyurethane compositions as sublayers and an experimental assessment of their performance under conditions of elevated temperatures in contact with water was carried out.

The results are presented of research on the mechanical and thermophysical characteristics of a composite material—paper mass. The work determined the thermal conductivity coefficient, density, sound speed at surface sounding, and destructive force for the first layer, which was 2 mm thick, and for the composite as a whole. In total, six samples of different geometrical shapes were researched.

A review of materials used for lightning-protection systems of polymer composite materials has been presented. The features of the manufacture of metal perforated foils and metal knitted wire meshes used to create effective lightning-protection systems for carbon composite structures have been considered.

The results of a study of the influence of fluoroplastic F-42 on the properties of an elastomeric material based on nitrile butadiene rubber BNKS-18AMN are presented. To increase the interaction with the elastomeric matrix, the F-42 method of preliminary mechanical activation was used. It has been shown that modified vulcanizates are characterized by increased oil, wear and frost resistance while maintaining the level of elastic-strength characteristics and relative residual compression strain.