The paper presents the results of a study of the surface charge of polymer materials modified with fluorocarbon films formed by ion-plasma technology at different CF4 contents in the CF4 + CeH12 ...plasma mixture. Nanostructured fluorocarbon films formed on the surface of polyethyleneterephthalate and polystyrene have a positive charge in the region of "transient" processes, and films on the surface of polytetrafluoroethylene have a negative charge, which is associated with different topology of the relief on the surface of these polymers, as well as their polarity.
A new type of the four-component tandem Knoevenagel—Michael reaction was discovered, which used arylaldehydes,
N,N
′-dimethylbarbituric acid, dimedone, and morpholine or piperidine in organic ...solvents or in water. The reaction proceeded under mild conditions at room temperature with the formation of a new substituted unsymmetrical polycyclic ionic scaffold in 83–98% yields. The structures of the reaction products were confirmed by X-ray diffraction analysis on the example of two compounds. The further oxidative cyclization of the Knoevenagel—Michael reaction products led to unsymmetrical substituted dihydrofurans spiro-annulated with
N,N
′-dimethylbarbituric acid. The structures of the synthesized compounds were confirmed by X-ray diffraction analysis.
In the paper, the problems of the formation of carbon coatings by low frequency atmospheric pressure plasmatron in a matrix deposition mode are considered. The influence of the main technological ...parameters of the process of coatings formation on the thickness and contact wetting angle are also investigated.
The formation of fluorocarbon coatings from plasma-forming mixtures CF4 + C6H12 and C4F8 + C6H12 on the surface of polyethyleneterephthalate and polystyrene using ion-plasma technology are ...considered. Nanostructured polymer materials have increased fungi resistance and high optical characteristics.
The problems of the formation of fluorocarbon coatings in a plasma-forming mixture CF4 + C6H12 on the surface of polyethyleneterephthalate and polytetrafluoroethylene by ion-plasma technology are ...considered with the aim of increasing mushroom resistance, in particular, the relief parameters of the formed coatings (root-mean-square deviation of the roughness, average high heterogeneity peaks, average distance between peaks) and their influence on mushroom resistance
This paper is devoted to study of the formation of fluorocarbon coatings, which were obtained by using a low-frequency plasmatron of a low-temperature plasma at atmospheric pressure. The possibility ...of forming fluorocarbon coatings on silicon, and PET and polystyrene substrates is shown. The spectra of the UV and visible ranges were obtained, the width of the band gap of the obtained coatings was established by the Tauc method. The nanohardness of the obtained coatings was studied by the Oliver-Farr method.
The main factors that determine the possibility of obtaining nanostructured fluorocarbon films with antimicrobial antiadhesive properties when forming them under the conditions of transient processes ...when using two-component gas mixtures are considered. An experimental test of the formed coatings for resistance to biodegradation was carried out.
The paper presents the results of a study of polyethyleneterephthalate (PET), modified by nanostructured fluorocarbon films formed by vapor deposition in a vacuum using a two-component gas mixture ...containing a film coating component (C6H12) and an etching component (CF4). The dependence of the dielectric loss tangent and permittivity on the ratio of the components of the gas mixture is established. The obtained data were correlated with the physicochemical characteristics of the materials used.
This paper presents the results of a study of the formation of fluorocarbon coatings obtained by using a low-frequency plasmatron of a low-temperature atmospheric pressure plasma in a dynamic mode of ...deposition. The main dependences of chemical vapor deposition (CVD) are investigated. The absorption spectra in the UV range was studied, and the band gap was determined by the Tauc method.
The paper is devoted to the problem of fight with biodestruction, the presence of which defines the duration of effective exploitation of polymeric materials and wares. The results showed the ...possibility of creating a field of transient processes that prevent the adhesion of microbial cells on the surface of polymeric materials. The specified transient area is the result of the optimum fluorine content in the film and the formed relief, which together ensure the absence of adhesion of microbial cells. The relief characteristic for the field of transient processes is different for polymers of various chemical structure. The study of antifungal activity showed that the areas of transient processes in different polymeric materials, ensuring the absence of cell adhesion of microorganisms and fungi, almost coincide.
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