Wyniki wyszukiwania - BazTech

1

Preparation, properties and potential applications of a photocurable varnish with pleasant limonene smell

Bednarczyk P., Wróblewska A., Czech Z., Malko M.W., Rozwadowski Z., Markowska-Szczupak A.

Polish Journal of Chemical Technology

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2016

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Vol. 18, nr 2

13--19

EN

Photocurable materials which are obtained on the basis of urethane acrylate resins are often used in the industry for the production varnishes or protective coatings. The main disadvantage which is connected with the utilization of these varnishes is their unpleasant smell during the process of production and curing. This work presents the photocurable varnish which was obtained on the basis of aliphatic urethane acrylate and R-(+)-limonene. The utilization of this raw materials allows to obtain the smelling coatings. The aim of this work were the studies on the influence of limonene molecules on the mechanical properties of the UV-cured coatings. These studies showed that the coatings with limonene molecules retain their properties, and are characterized by the very good adhesion, cohesion and high gloss. These kinds of varnishes can be applied for preparation of appropriate protective coatings on the surface of wood, metals, and nail plates. These protective coatings have not only pleasure smell but also can have the bactericidal and fungicidal properties. The studies performed with Escherichia coli ATCC29425 and Candida albicans confirmed these properties.

2

Efficient method for Knoevenagel condensation in aqueous solution of amino acid ionic liquids (AAILs)

Ossowicz P., Rozwadowski Z., Gano M., Janus E.

Polish Journal of Chemical Technology

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2016

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Vol. 18, nr 4

90--95

EN

This work reports on the use of the amino acid ionic liquids (AAILs) which have been used as catalysts in Knoevenagel condensation of various aldehydes with malononitrile. For research we use tetrabutylammonium ionic liquids based on eight natural amino acids. The reaction was carried out in an aqueous medium. Using water as solvent provided efficient and simple method of isolation of pure product with high yield. Moreover, amino acid ionic liquid dissolved in water could be reused many times without any loss of its catalytic activity. The influence of the anion was studied. Moreover the effect of technological parameters such as: the temperature, the catalyst content, and the reaction time on yield of reaction were investigated.

3

Synteza i właściwości didecylodimetyloamoniowych soli aminokwasów

Ossowicz P., Janus E., Rozwadowski Z., Pilawka R.

Przemysł Chemiczny

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2013

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T. 92, nr 9

1649-1652

PL

Otrzymano sole didecylodimetyloamoniowe L-aminokwasów, będące cieczami w temperaturze pokojowej. Strukturę otrzymanych związków potwierdzono za pomocą NMR, FTIR i UVVIS. Zbadano stabilność termiczną, lepkość i skręcalność światła spolaryzowanego oraz właściwości powierzchniowo czynne otrzymanych związków.

EN

Five didecyldimethylammonium salts of L-amino acids were synthesized and identified by 1H-NMR, 13C-NMR UVVis, FT-IR spectra. Viscosity, thermal stability, specific rotation and surface activity of the salts were detd.

4

A Conformational Study of Some Secondary 1-Methyl-2-pyrrolecarbothioamides

Jagodziński T. S., Dziembowska T., Jagodzińska E., Rozwadowski Z.

Polish Journal of Chemistry

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2001

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Vol. 75, nr 12

1853-1861

5

UV-Visible Absorption Spectroscopic Studies of Intramolecular Proton Transfer in N-(R-Salicylidene)-alkylamines

Król-Starzomska I., Rospenk N., Rozwadowski Z., Dziembowska T.

Polish Journal of Chemistry

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2000

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Vol. 74, nr 10

1441-1446

EN

Results of UV-visible spectroscopic studies on thermodynamic parameters of the intramolecular proton transfer equilibrium in N-(R-salicylidene)-alkylamines in solution are presented. The estimated DeltaHPT values in CH2Cl2 solution are within the range –5.2 to –13.9 kJ/mol. DeltaSPT values are negative: from –28 to –48 J/molK. The obtained results demonstrate the influence of the acidity of the phenolic group as well as charge delocalization on the position of the proton transfer equilibrium.