Person: ÖNER, ERHAN
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ÖNER
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ERHAN
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Publication Metadata only A new process of combined pretreatment and dyeing: REST(ELSEVIER SCI LTD, 2011) YILMAZ, BURCU; Oner, Erhan; Sahinbaskan, Burcu YilmazUse of enzymes in textile processes has many advantages as far as the environmentally friendly processes are concerned. These advantages include water and energy savings, less chemical use, less fabric damage, mild and environmentally friendly process conditions. In this work, C.I. Reactive Yellow 15, C.I. Reactive Red 21 and C.I. Reactive Blue 19 were used to dye untreated woven cotton fabric in a laboratory scale dyeing machine, on a pilot scale jig and on a pilot scale winch by using a single bath combined process, in which various enzymes, namely, amylase, pectinase, and catalase were employed. This new process was named as the Rapid Enzymatic Single-bath Treatment (REST), since it was completed almost in half of the conventional dyeing time, and all of the stages, namely, desizing, scouring, bleaching and dyeing were carried out in a single bath without replacing the process water with fresh water until the end of the dyeing. In the REST process, the untreated, starch-sized fabric was first desized by amylase enzyme, and this was followed by a pectinase treatment in the same bath. The fabric was then bleached by H2O2 in the same bath, and after the hydrogen peroxide bleaching; the catalase enzyme was added to the bath to remove H2O2 residues before reactive dyeing. Without carrying out intermediate washings/rinsings between these processes, the reactive dyeing was carried out in a conventional way in the same bath, and finally, the fabric was taken from the bath and washed out. The colour yield was compared with the dyeings which were carried out conventionally in separate baths. Finally, the REST has many benefits in terms of water saving, reduced process time and energy consumptions compared to the conventional preparatory and dyeing process of cotton fabrics. (C) 2011 Elsevier Ltd. All rights reserved.Publication Metadata only Microwave-assisted dyeing of poly(butylene terephthalate) fabrics with disperse dyes(WILEY-BLACKWELL, 2013) ÖNER, ERHAN; Oner, Erhan; Buyukakinci, Yesim; Sokmen, NihalIn this study, conventional heating and microwave dielectric heating in the exhaust dyeing of poly(butylene terephtalate) fabrics with disperse dyes were studied in order to determine whether microwave heating could be used to increase the dyeability of poly(butylene terephtalate) fibre in shorter processing times and enable dyeings of adequate wet fastness to be obtained. Accordingly, the samples of 100% poly(butylene terephtalate) single jersey knitted fabric were dyed with CI Disperse Yellow160 and CI Disperse Yellow42, CI Disperse Red177 and CI Disperse Red91, CI Disperse Blue79:1 and CI Disperse Blue54 at 98 degrees C with or without microwave dielectric heating. The colouristic properties, colour fastnesses and the tensile properties of the dyed fabrics were investigated and compared with each other. Microwave dielectric heating is regarded as a tool for green chemistry' and provides many advantages over conventional heating without any deterioration in the properties of the dyed materials. Microwave heat dyeing enhances the exhaustion and the fixation of dye, and good colour fastnesses and repeatability in dyeings are achieved in short heating times of the dyebath.Publication Metadata only Microencapsulated organic coconut oil as a natural phase change material for thermo-regulating cellulosic fabrics(SPRINGER, 2019) ÖNER, ERHAN; Sarac, Elif Gozde; Oner, Erhan; Kahraman, M. VezirIn this work, coconut oil was utilized as a natural phase change material (PCM) and applied on cellulosic fabrics for thermo-regulation. Organic coconut oil was microencapsulated in melamine formaldehyde and poly (methyl methacrylate) polymer shells by in situ and suspension polymerization methods, respectively. The fabricated microcapsules were applied on a daily wear stretch denim fabric and a cotton shirting fabric by knife-coating to impart thermo-regulation functionality. The microencapsulated PCMs and the treated fabric samples were characterized using Fourier transform infrared spectroscopy, differential scanning calorimetry, thermal gravimetric analysis and scanning electron microscopy. The results indicated that latent heats of 81.9 J/g and 39.1 J/g at melting peak temperatures of 21.5 degrees C and 22.1 degrees C were successfully achieved with the microencapsulated PCMs which enabled the fabrics to possess remarkable latent heats in between 6.7 and 14.9 J/g. Graphic abstract