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Bleaching of Hemp (Cannabis Sativa L.) Fibers with Peracetic Acid for Textiles Industry Purposes
Görkem Gedik,Ozan Avinc 한국섬유공학회 2018 Fibers and polymers Vol.19 No.1
Hemp plant exhibits various eco-friendly properties and hemp fiber processing does not cause environmental damage, however, it is known that most chemical operations have a risk to interrupt a sustainable production. As stated in several studies, peracetic acid is an important environmental friendly bleaching agent when compared to its conventional competitors. In this study, hemp fabric was bleached with peracetic acid with exhaustion and padding methods. The effects of temperature, pH, process time, concentration on whiteness values were determined. The influences of bleaching processes were investigated via instrumental and imaging methods. Physical properties of the treated fibers were also tested. Besides peracetic acid, hydrogen peroxide bleaching was carried out for comparison. COD values of bleaching effluents wereanalyzed for selected samples. Higher whiteness values were obtained with exhaustion bleachings than pad-batch bleachings.Quite high whiteness values (up to 68.13 Stensby whiteness index) attained in peracetic acid without significant fiber damage.
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Emine Bakan,Fikret Karcı,Ozan Avinc 한국섬유공학회 2018 Fibers and polymers Vol.19 No.3
A series of disazo pyrazole disperse dyes were synthesized and reported at our previous work. These 8 synthesized disazo pyrazole disperse dyes (3a-3h) were applied to poly(lactic acid) (PLA), poly(ethylene terephthalate) (PET), and polyamide 6.6 fibers. Their colorimetric and color fastness properties were investigated. All studied fibers dyed with these synthesized dyes exhibited yellow-red shades. 3c (p-Cl), 3e (m-Cl), and 3h (o-Cl) disazo disperse dyes, having auxochrome -Cl, led to the lowest color yield values for all three studied fibers. The same dyes resulted in higher color strength with darker shades on the PET and PLA fabrics in comparison PA 6.6 fabrics. 3a (p-NO2), 3b (p-OCH3), 3d (m-NO2), 3f (o-NO2), and 3g (o-OCH3) disazo disperse dyes can be recommended for PLA and PET dyeing from the color point of view leading to medium to heavy depth of shades. The wash, alkaline and acidic perspiration, dry and wet rub, water and sea water fastness levels of PLA, PET, and PA 6.6 samples dyed with 3a-3h dyes were generally quite high and in the commercially acceptable range with few exceptions. Dyed PLA fabrics displayed better sublimation fastness levels than dyed PET and PA 6.6 fabrics. Synthesized disperse dyes resulted in high light fastness performance on especially PET and PLA fibers. Light fastness level was better for dyed PET samples by comparison with dyed PLA and PA 6.6 fabrics.
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Ali Goudarzi,Atasheh Soleimani‑Gorgani,Ozan Avinc 한국섬유공학회 2023 Fibers and polymers Vol.24 No.2
Electrically conductive printed textiles are gaining increasing interest and demand worldwide. Cotton fabric's porosity andhigh surface roughness avoid electrically conductive printed patterns on the fabrics. This paper reports the in-situ solutiondeposition of silver free particles inkjet ink via an aqueous single-stage inkjet printing process, which improved electricalconductivity and fastness properties with a new approach. The cotton fabrics were pre-treated with different polyvinylchloride(PVC) solutions prepared in various solvents such as tetrahydrofuran (THF) and dimethylformamide (DMF) that differedin boiling temperature. Afterward, PVC-pre-treated fabrics were printed through the HP Deskjet inkjet printer. The resultsshowed that the PVC-pre-treatment of cotton fabrics significantly improved the electrical conductivity (< 2 Ω/□), antibacterialactivity, thermal management, droplets repellency, adhesion, abrasion, and washing fastness properties, as well as flexibilityproperties. The solvent type in PVC solutions affects the physical properties of the pre-treated cotton fabric. The comparisonin rheological behavior of PVC solutions in DMF and THF at different temperatures displayed the significant difference inviscosity at gel-point for THF and DMF solution. THF solution with higher viscosity cannot diffuse more into porositiesof cotton fabric than the DMF solution, which affects the silver nanoparticles' average crystal size and the final electricalconductivity of the printed fabric. It is the first time using an economical polymer layer on cotton fabrics to provide robustelectronic printed patterns by single-stage inkjet printing. The results confirm that the flexible electronic printed fabric canbe used as a multifunctional electronic textile.
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