Publikace vydané Univerzitou Pardubice / Published by the University of Pardubicehttps://hdl.handle.net/10195/376312024-03-19T06:37:42Z2024-03-19T06:37:42ZEffect of concentration of zinc-powder in epoxy-ester based anticorrosive coatingsRaycha, YashKohl, MiroslavKalendová, Andréahttps://hdl.handle.net/10195/824132023-10-24T16:36:02Z2023-01-01T00:00:00ZEffect of concentration of zinc-powder in epoxy-ester based anticorrosive coatings
Raycha, Yash; Kohl, Miroslav; Kalendová, Andréa
Adam, Martin
The present work is directed to study the effect of zinc powder concentration on anticorrosive efficiency of epoxy ester resin-based anticorrosive coatings. A high performance of zinc coating for metal protection is of vital importance depending on the concentration of zinc incorporated into coating formulation. Zinc pigment gives protection against corrosion by cathodic protection and barrier protection mechanism; however, it is necessary to keep adequate dosage of zinc. A lower dosage of zinc is insufficient to obtain sufficient cathodic protection while much higher concentration leads to the pores in the film which may influence corrosion. Therefore, this study was
focused on the development of highly effective zinc coatings for excellent anticorrosion protection, as well as mechanical performance, when using standardized tests on corrosion, mechanical and chemical properties.
2023-01-01T00:00:00ZPolyfluorene derivatives as a promising candidate for coating applicationMechergui, ImenPiana, FrancescoKohl, MiroslavKalendová, Andréahttps://hdl.handle.net/10195/824122023-10-24T16:29:13Z2023-01-01T00:00:00ZPolyfluorene derivatives as a promising candidate for coating application
Mechergui, Imen; Piana, Francesco; Kohl, Miroslav; Kalendová, Andréa
Adam, Martin
This paper is focused on the synthesis and the characterization of one of the cationic water-soluble conjugated polymers based on polyfluorene (PF) derivatives with terminal amino-groups named poly(9,9-bis(2-(N-ethan(pyrolin-1-yl))ethan)fluorene dibromide (shortly abbreviated as "para phenyl") synthesized by Suzuki-Miyaura
coupling reaction and quaternized through a bromoalkylation on pyrrolidine groups, giving rise to a conjugated ammonium polyelectrolyte (P2). The structure of the obtained polyfluorene derivatives (P1 and P2) was confirmed by 1H NMR and FTIR
and their photophysical, electrical, and electrochemical properties fully investigated. The results show that the new polyfluorene electrolyte could be a strong candidate as a coating material thanks to its chemical stability and high conductivity.
2023-01-01T00:00:00ZStudy on the properties of new anti-corrosion pigments containing Mg2+ cation in epoxy ester resin-based coatingsBoštíková, KarolínaKalendová, AndréaKohl, Miroslavhttps://hdl.handle.net/10195/824112023-10-24T16:21:59Z2023-01-01T00:00:00ZStudy on the properties of new anti-corrosion pigments containing Mg2+ cation in epoxy ester resin-based coatings
Boštíková, Karolína; Kalendová, Andréa; Kohl, Miroslav
Adam, Martin
The aim of the work was to study the protective properties of epoxy ester coatings containing newly synthesized organic pigments based on azo compounds in dependence of their chemical composition and concentration. For applications in anti-corrosion coatings, organic pigments containing the Mg2+ cation with expected anti-corrosion
properties have been newly synthesized and their effect on epoxy ester coatings' physicochemical and corrosion resistance studied. In the same effort, inorganic oxides with Mg2+ cation content based on periclase and mixed magnesium-iron oxide and an industrial standard were also tested, the effectiveness of which had already been
confirmed in previous studies. The properties of the prepared paint materials and organic coatings were investigated using standardized physical-mechanical tests together with accelerated cyclic corrosion tests in simulated corrosive atmospheres and electrochemical
linear polarization technique. The results obtained with the coatings based on tested pigments containing epoxy-ester resin have confirmed the corrosion-inhibiting effect of the newly synthesized pigments.
2023-01-01T00:00:00ZMicrowave decomposition in the recycling of gadolinium from waste contrast agentsAudrlická Vavrušová, LenkaTykva, MarekKrejčová, Annahttps://hdl.handle.net/10195/824102023-10-24T16:06:46Z2023-01-01T00:00:00ZMicrowave decomposition in the recycling of gadolinium from waste contrast agents
Audrlická Vavrušová, Lenka; Tykva, Marek; Krejčová, Anna
Adam, Martin
Unconsumed gadolinium-based contrast agents used in magnetic resonance imaging become medical waste after application. Such a waste is a mixture of plastic, glass, and the contrast agent itself and is usually burned in a hospital incinerator. Due to this, further recyclable materials are lost, as well as gadolinium, which is a valuable
industrial commodity. This work is focused on the possibilities of recycling waste containing gadolinium, when seeking optimum conditions for converting the gadolinium complex into the nitrate form applicable to further processing. The respective procedure is compared with the commonly used incineration of medical waste in terms of
environmental impacts. An LCA study comparing such ecologic aspects of these two product systems was developed. The current predominance of fossil sources in the composition of the energy mix in the Czech Republic is the reason for the less favorable
assessment of the newly proposed procedure.
2023-01-01T00:00:00Z