Abstract: New complex compounds of polyacrylate and polymethacrylate guanidine and composites based on them with Fe (II) ions were studied by the spectrophotometric method. The optimal conditions for complexation were studied. Thus, it was revealed that metal-complex polymers are formed at λ = 500 nm for PAG and λ = 510 nm for PMAG. The formation of complexes at pH = 6-7 was also proved.
Abstract: The effect of the length and concentration of carbon fibers on the rheological, mechanical and thermal properties of high-temperature thermoplastics – polyphenylene sulfone was investigated. As fillers fibers with a length of 0.2 and 3 mm are used.
Abstract: The results of the studies of the effect of excipients of mineral and organic origin on the mechanical properties of polyether sulfone based on 4,4'-dihydroxydiphenyl and 4,4'-dichlordiphenylsulfone are adduced. It has been shown that the introduction of hard fillers is accompanied by the increased modulus and reduced ductility of the polymer matrix, the intensity of these effects depends on the concentration, shape and particle size additives. It was revealed that the composites with talc and discrete carbon fibers were characterized by higher mechanical properties. Their test as materials for FDM 3D printing method shows the highest suitability composites with talc for this technology.
Abstract: The influence of talc and various polymeric additives on the basic mechanical properties of polyphenylenesulfone was investigated. It was found out that with the increase in the filler concentration there is an increase in stiffness, tensile strength and a decrease in the plasticity of the polyphenylenesulfone. While studying of polymer-polymer composites based on polyphenylenesulfone, high efficiency of polycarbonate as a modifier of impact strength was revealed. An effective method for producing a composite with a high impact strength and a modulus of elasticity has beendeveloped; it is based on the features of the distribution of the filler in the binary system polyphenylenesulfone – polycarbonate. The concentration of the filler in the polycarbonate phaseleads to low values of impactstrength, while its concentration in the phase of polyphenylenesulfone, followed by the introduction of polycarbonate leads to the formation of a high impact and high modulus composite. The samples obtained by 3D printing have high mechanical characteristics.
Abstract: The effect of process conditions on the 3D-print to physical-mechanical properties of products made of polyphenylene sulfone obtained by layering the molten polymer filament (FDM) was investigated. The dependence of physical-mechanical properties of polyphenylene sulfone on the following printing parameters: angle of orientation of yarn laying (bitmaps), the air gap between the circuits and rasters, the air gap between the raster, raster width was revealed. It is shown that the best physical and mechanical characteristics of polyphenylene sulfone close to the injection, are achieved by printing in a longitudinal orientation of the filaments with minimum width and negative clearances between them.
Abstract: The data on the methods for the preparation of polyetherketones by electrophilic and nucleophilic methods are considered and generalized. It is shown that polyetherketones by electrophilic substitution are carried out as homopolycondensation aromatic monocarboxylic acids and their halides and polycondensation of polynuclear aromatic hydrocarbons with aromatic dicarboxylic acids or their halides, and phosgene in organic solvents (1,2-dichloroethane, methylene chloride, nitrobenzene and etc.) in the presence of Ziegler-Natt catalysts. However, this process has not found an industrial application in view of such disadvantages as low yield of the desired product, the formation of a polymer with low molecular weight, synthesis time (15-40 hours), the use of large amounts of catalyst, the complexity of polymer purification of it.
Abstract: The thermal stability of polyether ketone, polyetheretherketone, polyarylene ketone at 400-500 °C was studied by gas chromatography. It was found out that the thermal destruction of polyetherketones and polyetheretherketones begins with the rupture of the ketone group, and polyarylene ketones with the detachment of the methyl group and the rupture of the ether linkage of the diane fragment.
Abstract: Differential scanning calorimetry was used to study the temperatures and character of phase transitions of fibers based on polyether ether ketones. It is shown that in the production of fine fibers from polyether ether ketones, a predominantly amorphous structure is formed. Increasing the temperature to the crystallization temperature leads to an almost twofold increase in the degree of crystallinity. Lower molecular weight polyether ether ketone is characterized by a higher rate of crystallization and the formation of a more homogeneous crystalline structure.
Abstract: The effect of heating cycles of polyether ether ketone up to 420 °C on the thermophysical properties was studied by the method of differential-scanning calorimetry. It is shown that with each subsequent heating the glass transition temperature increases, while the melting and crystallization temperature decreases, which may indicate an increase in the molecular weight of the polymer due to the structuring processes. The main degradation products of polyether ether ketone in air at temperatures of 350-450 °C were determined by gas chromatography and thermal decomposition schemes were proposed.