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CONCLUSIONS Cationic surfactants sensitize the reaction of Al, Ga and In with 8-hydroxyquinoline-5sulphonic acid. The effect of various surfactants was studied in details. The best results were obtained for Zephyramine and Septonex. The nature of the complex was investigated by the continuum variations method. Improved method for determination of Al, Ga and In in aqueous solutions was optimized and calibration plots were constructed. REFERENCES 1. Vercruysse A.: Hazardous Metals in Human Toxicology, Part B, Elsevier Amsterdam 1984 2. Garcia Alonzo J. I., Diaz Garcia M. E., Sanz Medel A.: Talanta. 31, 361 (1984) 3. Hinze W. L., Singh H. N.: Trends in Analytical Chemistry. 3, 193 (1984) 4. Graham R. C.: Data Analysis for the Chemical Sciences. A Guide to Statistical Techniques. VCH Publishers, New York 1993 5. ČSN ISO 8466-1: 1993, 15. Praha, 1993. 6. Anonyme: Anal.Chem. 52, 2245 (1980) Sborník soutěže Studentské tvůrčí činnosti Student 2006 a doktorské soutěže O cenu děkana 2005 a 2006 Sekce DSP 2006, strana 248
PHYSICAL-CHEMICAL ASPECTS OF PAINT FILMS DEGRADATION Ing. Lucie Wolfová Supervisor: prof. RNDr. Zdeněk Friedl, CSc. Brno University of Technology, Purkyňova 118, Brno 612 00, e-mail:wolfova@fch.vutbr.cz INTRODUCTION: My dissertation thesis deals with the physical-chemical aspects of paint film degradation. This work is focused on the study and examination of physical-chemical aspects of paint film degradation by selected solvents. Mainly it is considered to the determination of solubility parameters of used polymers δ2 and the examination of the influence of especially polymer structure to the value of this δ2. The main goal of this study is to verify the coating solubility theory based on the knowledge of their solubility parameters in practise and its application for coatings. The other goals include the projection and formulation some new solvent’s mixture and additives intended for removing paint films and graffiti. Such formulation need to be well performing and ecological acceptable at the same time, which is the precondition for their wide application in practise. THEORETICAL BACKGROUND: Chemical degradation of paint films could be defined as the physical and chemical interactions between film-forming components of the paint and chemical surroundings. During the chemical degradation of polymer a disruption of chains and reticulation, a change of chemical structure of chains, a change of side groups or combination of all these phenomena take place. This leads to changes in paint qualities and coats lose their visual appearance and original qualities upon the exposure to organic solvents. From the thermodynamic point of view, a solubility of polymer and a degree of solvent affinity to polymer is given by the Gibb´s energy change, which is determined by the interaction between solvent molecules and macromolecular chain elements. ΔGmix = ΔHmix - TΔSmix < 0. The more negative is value of ΔGmix the better is solubility of polymer in solvent. Then the dissolving of polymers is mainly a question of value ΔHmix because during swelling or dissolving always increase system’s disorderliness. According to thermodynamic conditions than is necessary that ΔHmix
Page 1 and 2: PRODUCTION OF SELECTED SECONDARY ME
Page 3 and 4: containing ampicillin, IPTG and x-g
Page 5 and 6: THE SIMPLE METHOD FOR THE RECOGNITI
Page 7 and 8: Figure 1 Negative-ion mode MALDI-TO
Page 9 and 10: Table 1 Evaluation of negative-ion
Page 11 and 12: Fig. 1: Scheme of the hydride gener
Page 13 and 14: [4] H. Matusiewicz, M. Kopras, J. A
Page 15 and 16: - are hypotriglyceridemic; - exhibi
Page 17 and 18: HYDROPHOBIZED SODIUM HYALURONATE IN
Page 19 and 20: spectrophotometer (AMINCO-Bowman, S
Page 21 and 22: Hyaluronate derivatives showed with
Page 23 and 24: copolymers were additionally functi
Page 25 and 26: Each micelle has a hydrophobic core
Page 27 and 28: STUDY OF THE COPPER(II) IONS NON-ST
Page 29 and 30: CuSO4, Cu(ClO4)2 and Cu2P2O7 of the
Page 31 and 32: total flux [mol.m -2 ] 0.7 0.65 0.6
Page 33 and 34: number of free radicals is very low
Page 35 and 36: Differences can be caused by severa
Page 37 and 38: MEASUREMENT OF THERMOPHYSICAL PROPE
Page 39 and 40: The typical time responses of tempe
Page 41 and 42: Figure 4 illustrates the typical de
Page 43 and 44: sodium sulphate and filtered to a 5
Page 45 and 46: Compare all tested evening primrose
Page 47 and 48: IMPROVED FLUORIMETRIC DETERMINATION
Page 49 and 50: Al F i 80 70 60 50 40 30 20 10 0 0
Page 51: F i 60 50 40 30 20 10 Data UCL LCL
Page 55 and 56: Finally, the solubility parameter o
Page 57 and 58: Study of the influence of different
Page 59 and 60: Fig.1: Chemical structures of pI ma
Page 61 and 62: Identification of pI markers - Firs

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