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Öğe Effect of hardness caused by using salts in dye houses on the yield of reactive dyes coloring(Inst Natl Cercetare-Dezvoltare Textile Pielarie-Bucuresti, 2011) Atav, Rıza; Yurdakul, Abbas; Kumbasar, E. Perrin AkcakocaIn this research, the effect of hardness, which arises from using salts in the dyeing process, on color yield was investigated. According to the experimental results, it was determined that even if soft water is used in the dyeing process, a sequestering agent usage could be necessary in order to prevent the hardness caused by salts.Öğe Effect of the ozonation process on the dyeability of mohair fibres(Wiley-Blackwell, 2011) Atav, Rıza; Yurdakul, AbbasThis work has focused on the use of ozonation in order to improve the dyeability of mohair fibres. The study was carried out using a known concentration of ozone and involved process parameters such as wet pick-up, level of pH and treatment time. The effect of fibre ozonation was assessed in terms of colour, and test samples were also evaluated using scanning electron microscopy and Fourier transform-infrared spectroscopy. The optimum conditions of the ozonation process were determined as 60% wet pick-up, pH 7 and 30 min. According to the experimental results, it can be concluded that ozonated mohair fibres can be dyed both at 90 and 80 degrees C with all dye classes without causing any decrease in colour yield. Dyeing kinetics and thermodynamics were also studied and it was demonstrated that the rate constant and the standard affinity of the ozonated sample increased.Öğe Effects of fixing agents on Fastness properties of Mohair Fibers Dyed with leveling acid dyes(Fiber Society, 2010) Atav, Rıza; Yurdakul, Abbas[No abstract available]Öğe Low Temperature Dyeing of Plasma Treated Luxury Fibres. Part I: Results for Mohair (Angora Goat)(Inst Chemical Fibres, 2011) Atav, Rıza; Yurdakul, AbbasThis study focused on the usage of plasma treatment for the modification of fibre surfaces to achieve the dyeing of mohair fibres at lower temperatures without causing a decrease in dye-exhaustion. The study was carried out using different gases under various powers and times. The effect was assessed in terms of colour, and the test samples were also evaluated using scanning electron microscopy (SEM). The optimum conditions of plasma treatment for improving mohair fibre dyeability are treatments carried out using Ar gas at 140 W for 60. According to the results of the experiments, it can be concluded that plasma treated mohair fibres can be dyed at lower temperatures (90 degrees C) and for shorter times (1 h instead of 1.5 h) with reactive dye without causing any decrease in colour yield. Dyeing kinetics were also researched in the study, and it was demonstrated that the rate constant and standard affinity of the plasma treated sample increased.Öğe Solvent Assisted Low Temperature Dyeing. Part I: Results for Mohair (Angora Goat) Fibres(Inst Chemical Fibres, 2011) Atav, Rıza; Yurdakul, AbbasIt is generally known that mohair tends to lose its luster when dyed for prolonged periods at the boil, and to preserve its luster it is generally necessary to use short dyeing cycles and low dyeing temperatures. Beyond preserving fibre luster, the dyeing of fibres at low temperature does have some advantages from an industrial point of view, namely saving energy, environmental control and fibre protection during dyeing. However, the problem of low temperature dyeing is that it hinders dye diffusion into the fibre, thus decreasing the colour yield of dyed samples. In this study, by using benzyl alcohol as a dyeing auxiliary at lower temperatures, it was possible to dye fibres at both at 90 degrees C and 80 degrees C for all dye classes without causing any decrease in colour yield. Dyeing kinetics were also studied, and it was demonstrated that in the presence of benzyl alcohol, the rate constant and Standard affinity increased.Öğe The effect of the usage of fiber protecting agent and dye class on the damage of Angora fibers occurred during dyeing process(Inst Natl Cercetare-Dezvoltare Textile Pielarie-Bucuresti, 2011) Atav, Rıza; Yurdakul, AbbasAngora fiber's properties are affected adversely when dyed for prolonged periods at the boiling temperature, and to preserve its luster, one of the alternatives is to use a fiber protecting agents in dyeing. This study has focused on the use of fiber protecting agent to preserve Angora fiber during dyeing treatments carried out at boiling point. Furthermore the effect of dye class on fiber damage during dyeing was also determined. According to the experimental results, in dyeing process at 100 degrees C by adding fiber protecting agent into the liquor degree of fiber damage decreases and reaches to damage value of fiber dyed at 80 degrees C. Furthermore, it can be concluded that bifunctional reactive dye usage is advantageous for the aim of fiber protecting during dyeing.Öğe The efficiency of ?-cyclodextrin in the post-dyeing removal of hydrolyzed reactive dyes(2013) Kumbasar, P.A.; Atav, Rıza; Özkaya, K.; Yurdakul, AbbasReactive dyes are the most commonly used dye class in cellulosic fibers dyeing. But during dyeing with these dyes, the hydrolyzation of dye may decrease dyeing efficiency and may cause the washing treatments after dyeing to be much harder. It is very important to remove hydrolyzed reactive dye from the textile material by washing treatments to obtain the desired fastness properties. In this research, usage possibilities of ?-cyclodextrins, that are nano-substances structurally consist of 7 D-glucopyranosyl units connected by alpha-(1, 4) glycosidic linkages, to enhance hydrolyzed reactive dye in washing treatments after reactive dyeing were investigated. According to the experimental results, it can be said that usage of ?-cyclodextrins is possible in washing treatments after reactive dyeing for dyes which form inclusion complex with it.Öğe The use of dendrimers to obtain low temperature dyeability on mohair and Angora fibers(Inst Natl Cercetare-Dezvoltare Textile Pielarie-Bucuresti, 2010) Atav, Rıza; Yurdakul, AbbasDendrimers are macromolecules with a regular and highly branched three-dimensional architecture. In this study, the aim was to improve the dyeability of mohair and Angora fibers via dendrimer application and to assess the potential of low temperature dyeability of these fibers. According to the experimental results, it was found that dendrimer applied mohair and Angora fibers could be dyed darker than the un-treated fibers and especially in dyeing mohair fibers with reactive dyes, it was determined that it is possible to dye dendrimer applied fibers at lower temperatures or shorter times, without causing any decrease in color yield.Öğe Ultrasonic Assisted Dyeing of Angora Fibre(Inst Chemical Fibres, 2016) Atav, Rıza; Yurdakul, AbbasIn this study it was aimed to determine the effect of ultrasound usage on the colour yield in dyeing angora fibres, and it was found that dyeing in the presence of ultrasound energy increases the dye-uptake of angora fibres, hence higher colour yield values were obtained. According to experimental results, it can be said that at all points the colour yield values were higher in the presence of ultrasound than in its absence. The difference between them was greater for darker shades and for dyeing carried out in an acidic medium (pH 5), and also for moderate dyeing periods (90 min). Furthermore there is no important difference between washing fastness, alkali solubility and strength values of fibres dyed in the presence and absence of ultrasound.
