Key Engineering Materials Vol. 869

Abstract: The method of gas chromatography was used to study of the stabilizing effect of the organophosphorus compound tetrakis (2,4-di-tert-butylphenyl)-4,4-biphenyl diphosphonite on polyether ether ketone. The possibility of maintaining the structure of polyetheretherketone under conditions of its extrusion processing without the risk of deterioration of the main technological and operational characteristics is revealed.

Abstract: FDM-printing technology is widely used in many fields including highly responsible industries such as aerospace, oil and gas and automotive manufacturing. Polyphenylene sulfone and its composites are one of the most common used high-performance polymers in those fields but polyphenylene sulfone is expensive and the lower material would be used for production the more applications could be able to enroot polyphenylene sulfone to their industries. Additive manufacturing opens new boundaries comparing to traditional technologies allowing to use the grid filling of parts which can help to reduce the material expenditure. In this research the influence of grid filling to mechanical properties of polyphenylene sulfone and its carbon-filled composite samples obtained using FDM-printing technology was studied. The article includes results about the effect of various grid sizes and its type on the mechanical properties of polyphenylene sulfone and its carbon-filled composite samples, and It shows the possibility of significant material savings while maintaining the required product properties.

Abstract: New universal modifiers (UM) - simple block copoly-ether-hydroximates of various chemical structures were synthesized. It was found that a 5 % by weight addition of UM to Radel R, an industrial aromatic simple polyethersulfone, improves its heat, heat resistance and physicomechanical properties.

Abstract: The features of obtaining carbon plastics and specific solutions to problems associated with the compatibility of an inorganic filler and a polymer matrix, the formation of adhesive contact of carbon fillers due to the formation of chemical bonds, mechanical adhesions, local stresses and defects at the phase boundary are considered. Successful solutions are presented that provide high adhesive strength between the filler and the polymer matrix.

Abstract: The diketoximes of 4,4'-diacetyldiphenyl oxide and 4,4'-diacetyldiphenyl sulfide were synthesized, the possibility of their use for the synthesis of simple and complex polyesters and polypyrroles, as well as the ability to complex with nickel salts. Organic chemistry used oximes in the 19th century, afterward, as an analytical reagent in the 20th century. Currently, oximes are superior to carbonyl compounds and alcohols in the variety of reactions and the widespread use in synthetic chemistry. Oximes easily turn into other classes of organic compounds – amines, cyano and nitro compounds, carbonyl compounds, heterocyclic compounds, including pyrroles, imidazoles, pyridines, they can be used as suitable compounds with salts of Cu (II), Ni (II), Zn (II), Cd (II), and Co (II). Oximes with complex heterocyclic and aromatic substituents are used as intermediates in fine organic synthesis. It should be noted that oximes have a wide spectrum of biocidal action and are used as anti-inflammatory, antiviral, antimicrobial agents, insecticides. Their versatile biological activity is considered in the preparation of antidepressant, sedative, vasodilator and other drugs [1].

Abstract: Composite materials based on natural polysaccharides and polyguanidines are considered. The synthesis mechanisms and structural features of composite materials based on polyguanidines and polysaccharides are discussed. The issues of the relationship of their structure with antimicrobial activity are highlighted. It has been shown that the modification of polysaccharides with guanidine-containing compounds makes it possible to give them bactericidal properties, increase strength and solubility, and is a promising direction for the development of new-generation drugs.

Abstract: This article provides a literature overview of glass-filled polyarylene sulfones. The main properties of polyarylene ether sulfones and applications are given. The industrially produced brands of glass-filled composites and their properties are shown. A problem of low interfacial interaction between polymer and fiberglass and the ways to increase was considered. Also the results of development of glass-filled composites based on polyphenylene sulfone for using in additive technologies, in particular 3D-printing by FDM method are shown.

Abstract: Conductive polymer composite materials for polymer electrolyte membrane fuel cells bipolar plates have been successfully prepared from renewable plant biomass sources. The composites are based on various conductive fillers (natural, oxidized and colloidal graphites) and the 5-hydroxymethylfurfural synthesis by-product resin that consists of complex furanic oligomers and polymers. The influences of the resin content and type of conductive filler were investigated. The conductivity of the composite are decreased with increasing resin content, but its mechanical properties are improve. A sample with a resin content of 10 wt. % and colloidal graphite filler have showed the optimal balance between electrical conductivity and mechanical properties. The interfacial contacting resistance, flexural and compressive strength of the composite were 0.035 ohm•cm2, 18.4 MPa and 21.4 MPa, respectively. Composite based on 5-hydroxymethylfurfural synthesis by-product resin and conductive filler (colloidal graphite) are showed a great potential application as bipolar plates for polymer electrolyte membrane fuel cells.