Papers by Burcu Karaca Uğural
Pectinase enzyme treatment subsequent to atmospheric air-or argon-plasma surface modification was... more Pectinase enzyme treatment subsequent to atmospheric air-or argon-plasma surface modification was applied in linen fabric preparation. Wettability by water drop test, wickability by thin layer wicking experiment, residual pectin content and colour of the fabrics were characterized. Results clearly proved that the efficiency of pectinase in improving linen water absorbency can be significantly enhanced by plasma pretreatment. Argon-plasma pretreatment followed by a Beisol PRO enzyme treatment reduced the wetting time considerably and resulted in a fabric surface that has been characterized by the lowest water contact angle (86.6°). All the applied treatments increased the energy of the fibre surface. The alkaline scoured, the argon-plasma treated and the argon-plasma-pectinase treated samples have been characterized by the highest c total S values. Plasma treatment significantly decreased the whiteness and increased the yellowness of the raw fabrics. However, the enzyme treatment applied after the plasma treatment has overcome the colour differences.
In previous studies; effects of enzymatic treatments on linen fabrics have been mostly investigat... more In previous studies; effects of enzymatic treatments on linen fabrics have been mostly investigated in terms of wettability, sorption properties, whiteness-yel-lowness index, and K/S values after dyeing. However, surface chemistry and topography of enzyme-treated linen fabrics have not been reported enough. The aim of this work was to examine the effect of pectinase treatments on surface structure and chemical properties of greige linen fabrics by using instrumental techniques. After enzymatic treatment, adequate removal of noncellulosic impurities from the fiber surface has been proved by AFM images and O 1 /C 1 ratio of the treated surface. Water drop test measurement and absorbance spectrographs of FTIR analysis have supported the results. It was observed that achievement in bioscouring is familiar to conventional alkaline scouring.
Effects of enzymatic and atmospheric plasma treatments individually and their combinations on kni... more Effects of enzymatic and atmospheric plasma treatments individually and their combinations on knitted PET fabrics
were investigated in terms of hydrophilicity, surface modification and moisture management properties. Cutinase from
Humicola Insolens, lipase from Candida SP and atmospheric plasma with air and argon gases were applied to PET fabrics. To
evaluate results, moisture management tester (MMT) and scanning electron microscopy (SEM) were utilized. Wicking heights
of samples were measured by wicking test method. Improved moisture management properties were observed with
environmentally benign processes compared to the untreated ones. Especially combined treatments have given the same or
slightly better results than those of conventional alkaline treatments. Fabrics treated with plasma and then followed by
enzymatic incubations have significantly improved the wetting time, absorption rates and spreading speed results.
Polyesters are widely used in various industrial applications and preferred for their outstanding... more Polyesters are widely used in various industrial applications and preferred for their outstanding properties such as high strength, resistance to abrasion, shrinking, wrinkling, most of the chemicals and environmental conditions. However the hydrophobic surface structure due to the lack of polar groups on the surface brings difficulties in processing and utilization of polyesters. Enzymatic reactions have been pointed out as an alternative eco-friendly method to overcome the hydrophobic surface structure of PET. The effect of enzymatic treatments on PET surface has been examined and explained by many papers in terms of improved hydrophilic characteristics. The goal of this study is to be able to enlighten the chemical background of improved hydrophilicity rather than to confirm the improvements by indirect methods. XPS (X-ray Photoelectron Spectroscopy) was utilized to monitor surface chemistry of cutinase and lipase treated PET fabrics in terms of elemental composition and chemical states of C atoms on the surface. In addition, surface morphology of enzyme treated PET fabrics was examined by AFM (Atomic Force Microscopy).
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Papers by Burcu Karaca Uğural
were investigated in terms of hydrophilicity, surface modification and moisture management properties. Cutinase from
Humicola Insolens, lipase from Candida SP and atmospheric plasma with air and argon gases were applied to PET fabrics. To
evaluate results, moisture management tester (MMT) and scanning electron microscopy (SEM) were utilized. Wicking heights
of samples were measured by wicking test method. Improved moisture management properties were observed with
environmentally benign processes compared to the untreated ones. Especially combined treatments have given the same or
slightly better results than those of conventional alkaline treatments. Fabrics treated with plasma and then followed by
enzymatic incubations have significantly improved the wetting time, absorption rates and spreading speed results.
were investigated in terms of hydrophilicity, surface modification and moisture management properties. Cutinase from
Humicola Insolens, lipase from Candida SP and atmospheric plasma with air and argon gases were applied to PET fabrics. To
evaluate results, moisture management tester (MMT) and scanning electron microscopy (SEM) were utilized. Wicking heights
of samples were measured by wicking test method. Improved moisture management properties were observed with
environmentally benign processes compared to the untreated ones. Especially combined treatments have given the same or
slightly better results than those of conventional alkaline treatments. Fabrics treated with plasma and then followed by
enzymatic incubations have significantly improved the wetting time, absorption rates and spreading speed results.