SCHOOL OF CHEMICAL ENGINEERING, SUNGKYUNKWAN UNIVERSITY
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Materials Technology HOMEResearchMaterials Technology
Materials Technology
Development of new materials is a core technology that has walked together with human history and technology movement. Studies on modern technology of new materials is focusing on the extraction of synergistic properties through a fusion of individual materials, which requires a profound understanding on the chemistry as a fundamental of the material and the chemical engineering as a toolkit for the realization. Our research group is fully constructing systematic resources for materials design, synthesis, characterization and manipulation, particularly based on the specialized organic and polymeric materials, from which we are directing the development of versatile materials for biomedical, electronic and industrial applications. Furthermore, under the academic banner of °?sustainable growth°Ø for the next generation, we are currently emphasizing studies on environmentally benign and low-energy consuming materials and processing.
 
섬유공정
진단/치료용 고분자소재
염색화학
고분자 소재합성
고분자화학
유변물성
고분자재료
나노소재 및 소자
고급전기시스템
Dyeing Chemistry
Major Research Areas
PHYSICAL CHEMISTRY APPROACH TO DYEING THEORY
Dyeing is concerned with coloured organic compounds which are soluble in appropriate solvents and which are capable of becoming absorbed on to molecular surfaces of textile substrates in a controllable manner, and of diffusing within these substrates. Consequently, the physical chemistry of dyeing covers aspects of the nature of solutions of complex molecules, adsorption and related interfacial phenomena, and diffusion. Further, it is often convenient to treat dyeing systems as being in a state of equilibrium, so thermodynamics is as important tool. Thermodynamics, however, gives no information about the way in which a system moves from one state to another. This is covered by kinetics, a branch of physical chemistry concerned with the rates and mechanisms of changes in system. Thermodynamics deals with system in equilibrium. The validity of thermodynamics depends only on three generalisations(the three laws of thermodynamis) and logical deductions from theses. Thermodynamics is, therefore, independent of any particular molecular model or theory. These topics present difficulties that are not encountered in the more traditional aspects of dyeing. Nevertheless, the researcher should persevere and make a determined effort to understand them, since they are essential to a proper understanding of modern dyeing techniques.
KINETIC APPROACH TO VS REACTIVE DYEING
Reactive dyes have become one of the most typical and conventional coloring matters for celulose, since they have good color-fastness, bright hues, and good cost performance. They are classified into two categories, I.e., dye nucleus with halogeno-heteroaromatics or sulfatoethylsulfonyl(sodium salt, SES) reactive end-groups, in which the latter one is called vinylsulfonyl(VS) dye and has large market. The frequently occurring hydrolysis of VS type and reverse hydrolysis of anchored dye at alkaline pH yielding the hydroxyethylsulfonyl(Hy) type are the wasteful reactions as the Hy type is completely inactive to dyeing. Therefore, it is much difficult to determine exact coloring conditions such as the initial concentration of VS dye, operating pH, temperature, timing and period of immersing cloth, quantity and timing of next addition of dye, salt and/or alkali in order to maintain the optimal dyeing conditions, ete. Thus, it may be the the forthcoming problem to know how we can find these parameters prior to the actual coloring practice, for instance, from the kinetic studies. The conclusions that energy from kinetic and mechanistic studies on the hydrolysis and the reaction of reactive dyes with cellulose have important technological implications in devising methods that enable reactive dyes to be applied to cellulose fabrics as efficiently and economically as possible, and in designing new dyes possessing desirable application properties. Nevertheless, some criticism has arisen on the grounds that certain of the basic assumptions have not yet been fully ujustifed under the actual conditions used in dyeing cellulose fiber. This research aims to clarify the following problems; a) the reaction mechanism of hydrolysis of VS reactive dyes. Knowledge of the mechanism of hydrolysis is useful for an understanding of the mechanissm of covalent bond fromation with the cellulose. b) the quantitative relationships between hydrolysis and reaction with cellulose. Knowledge of the quantitative relationships hydrolysis and reaction with cellulose is useful for an development of the new reactive dyeing method.
 
 
 
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