Journal of the University of Chemical Technology and Metallurgy, XXXVII, Book2, 2002
ON THE SYNTHESIS AND THE APPLICATION OF SOME BIFUNCTIONAL REACTIVE DYES
T. Konstantinova, P. PetrovaSTUDY ON THE ELECTROCHEMICAL BEHAVIOUR OF SOME MONO- AND BIFUNCTIONAL TRIAZINE REACTIVE DYES
A. Voulgaropoulos*, P. Petrova**, T. Konstantinova**ON THE SYNTHESIS OF SOME UNSATURATED 9-PHENYLXANTHENE DYES
T. Konstantinova, G. Cheshmedjieva-KirkovaPREPARATION OF SURFACE MODIFIED PVC DRAIN TUBING AND in vivo STUDY OF THEIR BIOCOMPATIBILITY
Y. Kicheva*, T. Vladkova**, V. Kostov*, C. Golander***AMORPHOUS PHOSPHATING OF MILD STEEL
L. Fachikov, H. Kozarev
ON THE SYNTHESIS AND THE APPLICATION OF SOME BIFUNCTIONAL REACTIVE DYES
T. Konstantinova, P. Petrova
University of Chemical Technology and Metallurgy,
8 Kl. Ohridski, 1756 Sofia, Bulgaria
E-mail: ppolya@uctm.edu
The synthesis of four bifunctional reactive monochloro triazine azo dyes was investigated. As basic chromophore two yellow triazine dyes, applied in the practice were chosen. Two different reaction schemes for synthesis were studied. Quantitative thin-layer chromatography (TLC) was applied to monitor the process. Cotton and linen fibres were dyed and the colourimetric characteristics of the dyed fabrics were measured. The dyes were copolymerized with Acrylamide (ACA) and Acrylonitrile (AN) giving polymers with intense colour that is stable to solvents extraction.
Keywords: bifunctional reactive triazine azo dyes, polymerisable dyes.
STUDY ON THE ELECTROCHEMICAL BEHAVIOUR OF SOME MONO- AND BIFUNCTIONAL TRIAZINE REACTIVE DYES
A. Voulgaropoulos*, P. Petrova**, T. Konstantinova**
*University of Thessaloniki, Chemistry Departament, GR-540 06 Thessaloniki,Greece
**University of Chemical Technology and Metallurgy,
8 Kl. Ohridski, 1756 Sofia, Bulgaria
E-mail: ppolya@uctm.edu
The electrochemical behaviour of twelve yellow monochlorotriazine reactive dyes containing azo functional group into aqueous solution was studied. It was determined that the reduction of the azo bond occurs. The influence of the scan rate and pH value on the reduction was determined. The number of the electrons involved in the electrochemical process of the reduction was estimated.
Keywords: monochlorotriazine reactive azo dyes.
ON THE SYNTHESIS OF SOME UNSATURATED 9-PHENYLXANTHENE DYES
T. Konstantinova, G. Cheshmedjieva-Kirkova
University of Chemical Technology and Metallurgy,
8 Kl. Ohridski, 1756 Sofia, Bulgaria
E-mail: gergana.che@mbox.bol.bg
The synthesis of 3 unsaturated 9-phenylxanthene dyes was investigated. The influence of the reaction parameters like concentration of the catalyst, molar ratio of the reagents and temperature was determined. Quantitative thin-layer chromatography (TLC) was used to monitor the process. The most favourable reaction conditions for the synthesis of the compounds were selected.
Keywords: unsaturated 9-phenylxanthene dyes, phase transfer catalysis, quantitative thin-layer chromatography.
PREPARATION OF SURFACE MODIFIED PVC DRAIN TUBING AND in vivo STUDY OF THEIR BIOCOMPATIBILITY
Y. Kicheva*, T. Vladkova**, V. Kostov*, C. Golander***
*Central Clinical Laboratories Medical Academy, Plovdiv
**University of Chemical Technology and Metallurgy,
8 Kl. Ohridski, 1756 Sofia, Bulgaria, E-mail: tgv@uctm.edu
***Institute for Surface Chemistry, Stockholm
PVC drain tubing were coated by acrylic acid plasma polymer, AAPP (hydrophilic, negatively charged surface, COOH) or polyethyleneglycole, PEG1900 (hydrophilic, non-charged surface, CH2CH2O) or hexamethylenedisiloxane plasma polymer, HMDSOPP (strong hydrophobic, SiO). Their biocompatibility was tested according to modified Gott's method. It was confirmed in vivo that there are at least two ways to make PVC surface less trombogenic: either making it strong hydrophilic nor extreme hydrophobic.
Keywords: PVC drain tubing, surface modification, biocom-patibility, in vivo testing.
AMORPHOUS PHOSPHATING OF MILD STEEL
L. Fachikov, H. Kozarev
University of Chemical Technology and Metallurgy,
8 Kl. Ohridski, 1756 Sofia, Bulgaria
E-mail: fachikov@uctm.edu
Phosphate coatings by a new developed bath of KAF-09-0F concentrate has been investigated. The effects of the bath temperature (20 - 80oC) and concentration (2 - 10 vol. %) on the phosphate coating thickness have been studied. It was established that the coatings are X-ray amorphous with filamentous formations on them.
The new phosphate concentrate KAF-09-0F has been successfully employed in several Bulgarian plants for preliminary detail treatment before paint coating.
Keywords: phosphating, amorphous phosphating, iron phosphating, mild steel.
