This paper presents the results of porous structure analysis of polishing materials based on polyurethanes used in chemicalmechanical planarization process of IC layers.

Upgrade of the composition of cable PVC-compound grade I40-13A with aluminum hydroxide has been carried out. Fire resistance, thermophysical and physical-mechanical properties of the obtained compounds have been investigated. It is shown that the modernization of the composition of cable PVC compound with aluminum hydroxide enables production of a fi re-resistant compound. It was found that aluminum hydroxide significantly changes the thermophysical properties of cable plastic compound. In particular, heat generation and smoke generation during plastic compound combustion are significantly reduced. It has been established that the physical-mechanical and rheological characteristics of the cable compound modernized with aluminum hydroxide remain at the level of the original compound. The optimal amount of aluminum hydroxide for the modernization of cable plastic compound of the I40-13A grade is 10–15 wt.%.

Examples of the implementation of non-destructive testing of structural transitions in polymer materials are presented. The method for determining the temperature of structural transitions is developed on the basis of the formulated boundary value problem of non-stationary thermal conductivity and its solution. When the polymers are heated, the values of the thermophysical properties change abnormally in the region of the structural transition. The measuring and thermal schemes of the method, the block diagram and the description of the measuring system are presented. The results of the experimental implementation of the method are presented.

In the work, the liquid monofunctional benzoxazine monomer based on phenol and aniline (P-a) was synthesized in melt and benzoxazine-epoxy compositions based on it were obtained. The processes of polymerization of a benzoxazine monomer and its copolymerization with epoxy resins of various structures and functionality in catalyzed and non-catalyzed systems have been investigated, and the rheological properties of the compositions have been evaluated. For the obtained polybenzoxazines and benzoxazine-epoxy copolymers, the thermal characteristics were determined, in particular, the glass transition temperature, the temperature of the onset of intense destruction and the coke residue. It has been established that the structure and functionality of epoxy resins have a different effect on the thermal characteristics of the copolymers.

This article covers the development of the thermoplastic extrusion films made of poly(vinyl acetate) (PVA) and poly(butyl methacrylate) (PBMA) for use as an inner layer in metal-polymer-metal multiple-layered vibro-damping materials that can work in contact with water. The effect of the amount of the introduced plasticizer on the dynamic properties of polymer films made of PVA and PBMA is studied on the example of plasticizers from the group of esters of dicarboxylic acids, organic phosphates and chloroparaffins. The processes of water sorption by polymer films and washing out plasticizers from them have been investigated. It has been demonstrated that PBMA-based films containing chlorinated paraffins as a plasticizer have the best water resistance.

Measurements of stress relaxation of two samples of decking boards after exposure in rain and chlorinated water, in ice, and in a mixture of gasoline and water in different concentrations from 1 to 7% were carried out. Samples consisting of 60% wood flour, 30% polyvinyl chloride and 10% additives were used for measurements. Additives are flame retardants, stabilizers, modifiers and dyes. The mineral filler CaCO3 was used as modifier. In sample No.1, the CaCO3 content was 42% and the wood content was 18%. For sample No.2, the CaCO3 content was 24% and the wood content was 36%. As a result of measurements after exposure for 200 days, it was found that the relative drop in mechanical stress decreases when the mineral filler is added to the composition. The nonlinear mechanical behavior for the initial sample No.1 is observed at 2% strain, and for the sample No.2 – at 3% strain. When aged in chlorinated water and in ice, the nonlinear mechanical behavior is observed for all deformations. The generalized relaxation curves indicate that decking boards can be used with confidence for a long time.

The article presents the results of studies of the tribotechnical properties of composite thermosetting polymeric materials based on an epoxy compound and ultrasonicated oligomeric fillers operating under conditions of contact interaction with a pulp using the example of raw cotton. Regularities of changes in tribotechnical properties (coefficient of friction, intensity of wear) of composite thermosetting epoxy polymeric materials associated with their filling with organomineral fillers and ultrasonic treatment, in contact with raw cotton have been revealed. The temperature and the magnitude of the electrostatic charge arising in the friction zone of rubbing polymer- cotton and composite-cotton pairs on the type and content of organic-mineral fillers were studied.

Using the example of hollow glass microspheres of the MS-VP-A9 gr.2 type the variability of the size, density, and strength of microspheres within a single batch was estimated. The dependence of the density and strength of hollow glass microspheres on their diameter has been studied. The kinetics of destruction of hollow glass microspheres during their loading by hydrostatic pressure is investigated.

A comparative analysis of the efficiency of the most common types of adsorbents of various natures in a test environment with high humidity for obtaining filled fibrous sorption-active materials by the method of solution aerodynamic spinning is carried out. The influence of the spinning methods, the composition and structure of the obtained sorption-active filled fibrous materials, the nature of the polymer matrix, and the type of organic test substances on the protective properties of materials has been studied.

Due to the widespread use of polyethylene oxide (PEO) in modern technologies, studies of the relationship between its supramolecular structure and properties by means of modeling methods have recently intensified, but usually the conformational features of the structure of polymers are not taken into account in modeling. Using the example of PEO, the article substantiates a method for calculating the influence of the conformations of a polymer molecule on the temperature dependence of the averaged square of the dipole moment of its molecules.

The analysis of methods for assessing the diffusion permeability of polymer materials is carried out. The limitations of the methods for determining the tightness time and the rate of fuel bleeding from elastic tanks based on thermoplastic polyurethanes are shown. To solve the set tasks, an approach is proposed related to establishing dependencies of the kinetics of diesel fuel bleeding in the coordinate system of the conditional time, which was calculated as the square root of the process time. The tightness time and rate of fuel bleeding depends on the degree of filling of the tank during testing.

This work analyzes the properties of polymers, which make them indispensable in the manufacture of elements used in optics, since the main requirement for polymers is stability when exposed to laser radiation. Currently, polymers are used as active laser media. The most commonly used is polymethyl methacrylate, which is highly transparent and the most resistant in relation to laser exposure.

A gel-forming composition based on dispersed sodium hydrosilicate, an acid modifier and a polymer additive has been developed. Тhe concentration ratios of components in it allow varying within a wide range the properties of the compositions and the formed gels, ensuring the possibility of their successful use at facilities with different geological and physical conditions (type of treated collector, degree rock permeability, temperature, etc.).

The process of ultrasonic pressing of inserts made of high-viscosity acetal homopolymer (polyoxymethylene) in the production of anti-roll bar racks is considered. Some dependencies between ultrasonic pressure parameters are detected.

The article discusses the technological features of the reaction extrusion of nanocomposites based on dressed natural minerals and high density polyethylene modified with compatibilizer and polypropylene. Clinoptilolite, vesuviane, bentonite and talc were used as natural minerals. The optimal technological mode of reaction extrusion was selected. Dicumyl peroxide in the amount of 0.25 and 0.5 wt.% was used as a vulcanization agent. The influence of technological features of reaction extrusion on the basic physicomechanical properties of nanocomposites based on polyolefins is considered.

In this work, regularities have been established that relate the number of layers of reinforcing material in a preform with the thickness and density of carbon fiber parts obtained by vacuum infusion. It is shown that in PCMs consisting of a small number of layers, the thickness of the monolayer is noticeably higher and the density is lower than in multilayer composites.