Polymer Science, Series D最新文献

The possibility of modifying industrial epoxy oligomer with epoxyphosphazene is considered. The influence of epoxyphosphazene on the gelation time, the kinetic constants of viscosity increase, and the values of activation energies of a binder based on ED-20 epoxy resin and diaminodiphenylmethane hardener is studied. It is shown that the introduction of epoxyphosphazene into epoxy resin does not reduce the original binder’s processability. The obtained data are necessary for the development of a domestic technology for the production of fire-resistant polymer composite materials.

This paper discusses the effect of the structure of butadiene–methylstyrene thermoplastic elastomers on the adhesive properties of adhesives based on them. The physicomechanical characteristics of films cast from a solution in methylene chloride have been determined. The molecular-weight characteristics of thermoplastic elastomers have been determined using gel permeation chromatography, and the microstructure has been determined using IR Fourier spectroscopy. Thermogravimetric analysis and differential scanning calorimetry have been used to study temperature and energy characteristics of thermoplastic elastomers, which indicate that the butadiene–methyl styrene thermoplastic elastomer sample has a more mobile butadiene block, which is responsible for the adhesion of the material, than the butadiene–styrene sample does.

The article considers some possibilities of creating new fire-resistant copolymers based on allyl monomers and quaternary phosphonium salts. Kinetic regularities and mechanisms of the copolymerization process are revealed. The study of the fire-protective characteristics of the copolymers showed that they are fire-resistant.

This article examines the main quality indicators of self-adhesive materials and methods for determining them. It lists international organizations involved in developing standards in the field of adhesive tape testing and describes the main requirements for devices and testing conditions.

The article presents the results of a study of the properties of conductive polyethylene composites intended for the manufacture of plastic fuel canisters by extrusion blow molding, based on low-density polyethylene (HDPE) and conductive grades of carbon black (CB). Within the framework of the work, the deformation-strength properties, specific volumetric electrical resistance, melt flow index, and density of the obtained materials were studied. It is shown that the grade of HDPE, as well as the grade and concentration of CB, determine the complex of operational and technological properties of the resulting composite, and, in the general case, for effective dissipation of static electricity, the concentration of CB in the composite should be 15–20 wt %

The review presents analysis of the published data on the manufacturing technologies and application areas of polyethylene modified with maleic anhydride. It is shown that the traditional technology of manufacturing maleinized polyethylene by reactive melt extrusion is currently prevailing. The majority of publications concerning the application of maleinized polyethylene address its use as a material for anticorrosive coatings and compatibilizers.

This article studies the regularities of changes in the adhesive binding quality in the manufacture of book and magazine products depending on the type of hot-melt binding adhesive and the type of printing paper. The work uses the foreign-made hot-melt adhesives Technomelt Q-2416 and Technomelt Q-3218, as well as the domestic hot-melt adhesive TK-3P, and offset and coated matte paper. The study objects were model adhesive joints in the form of paper–hot-melt adhesive–paper triplexes. The obtained experimental data allow us to quantitatively predict the change in the strength during delamination of adhesive joints under study depending on the pressing force’s magnitude during gluing. Their resistance to thermal aging and exposure to low temperatures, as well as the elasticity of corresponding adhesive films, are studied. It was found that in terms of gluing strength of the named types of paper, the domestic hot-melt adhesive TK-3P surpasses the imported hot-melt adhesive Technomelt Q-3218, while being inferior to the imported hot-melt adhesive Technomelt Q-2416. Sufficient elasticity and weather resistance were revealed for all the hot-melt adhesives studied.

It is shown that fused deposition modeling 3D printing technology allows combining casting technology and 3D printing, because it enables using silicone molds, which make it possible to use one printed master model to produce from 30 to 40 casting molds while maintaining the required 3D printing parameters. A program was developed to calculate the technological modes to produce silicone molds taking into account the individual parameters of compounds, the type of equipment for dosing a compound, and 3D master models, based on which silicone molds are obtained. Recommendations to use 3D printing methods to produce casting molds are also given.

The possibility of regulating the complex of cohesive and adhesive properties of epoxy–thiokol compositions by combining the products of preliminary thioetherification reaction based on resins of different molecular weights and the joint use of plasticizers and diluents in their composition has been investigated. A significant increase in parameters of tensile strength, strain at break, rupture work, and adhesive strength has been established when mixing the product of thioetherification reaction based on ED-20 resin with a ED‑8 resin with a higher molecular weight. It has been shown that replacing a small part of DOS plasticizer with a monoepoxy diluent vinylox makes it possible to additionally increase the adhesive strength value under shear and compressive strength. The introduction of a fairly large amount of powder-like quartz into the composition has virtually no effect on the adhesive strength value.

Features of the technological process of syrup filling have been considered. The shortcomings of conductometric container filling level sensors have been analyzed. An experimental model of a single-component syrup packaging system with a pneumatic bubble-type level sensor has been developed and tested under production conditions. Proposals for the development of automated syrup product packaging systems based on pneumatic automation have been formulated. The development of a multichannel conveyor system for packaging multicomponent syrups has been presented.