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RISS 인기검색어
- 검색키워드
- 저자 : Koviljka Asanović (검색결과 3 건)
- 무료
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Alkali Treated Jute Fabrics Suitable for the Production of Inexpensive Technical Textiles
Aleksandra Ivanovska,Koviljka Asanović,Maja Jankoska,Sanja Pavlović,Goran Poparić,Mirjana Kostić 한국섬유공학회 2022 Fibers and polymers Vol.23 No.8
This work aimed to obtain jute fabrics suitable for the production of inexpensive technical textiles by using simplealkali treatments. The influences of alkali concentration (1-17.5 % NaOH) and treatment duration (5-30 min) on the fabrics’compression properties, abrasion resistance, and sound absorption coefficient were studied in detail. With increasing thetreatment severity, the fabric compressibility decreases by 19.6-33.9 % due to increased fabric compactness. In parallel, thefiber crystallinity index and hemicellulose content decrease, while the fibers’ interfibrillar regions become less dense and lessrigid contributing to 19.0-27.0 % better recoverability after compression. The mercerized fabrics possessed a notably lowermass loss (4.1-5.9 %) after 750 abrasion cycles compared to the other investigated fabrics (18.9-30.9 %), which could beascribed to the higher friction forces existing between the yarns within the mercerized fabrics and between the fibers withinthe yarns, as well as higher elongation at maximum force. In the case of the fabrics treated for 5 or 15 min with differentNaOH concentrations, their mass losses during abrasion decrease with increasing the elementary fiber liberation, while thesound absorption coefficients increase with increasing the fabric compactness. Mercerized fabrics are capable of absorbingabout 28 % to 2.7 times (at 990 Hz) and 2.0 to 2.4 times (at 4090 Hz) higher mechanical sound energy compared to theuntreated fabric. The jute fabric mercerized during 30 min could be used for the production of carpet backings, while thosemercerized during 5 min is the most suitable for the production of sound-absorbing materials.
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Electrical Resistivity of Plasma Treated Viscose and Cotton Fabrics with Incorporated Metal Ions
Ana D. Kramar,Koviljka A. Asanović,Bratislav M. Obradović,Milorad M. Kuraica,Mirjana M. Kostić 한국섬유공학회 2018 Fibers and polymers Vol.19 No.3
Cellulose fabrics (viscose and cotton) were treated with atmospheric pressure dielectric barrier discharge (DBD) in air. After DBD treatment, samples were characterized and volume electrical resistance was measured under different relative humidity conditions (φ=40-55 %). Results have shown that DBD treatment increases wettability and polar surface functional groups content, which consequently causes a decrease of volume electrical resistivity of cellulose fabrics in measured relative humidity range (φ=40-55 %). Metal ions (silver, copper, and zinc) were incorporated in untreated and plasma treated samples through sorption from aqueous solutions and incorporation of metal ions into plasma treated cellulose samples decreased electrical resistivity even further. Resistivity of cotton and viscose fabrics with incorporated metal ions followed the order Zn2+ > Cu2+ > Ag+. The most pronounced decrease, for entire order of a magnitude, was obtained by modification of cotton fabric with DBD and silver ions, where value of resistivity dropped from GΩ to a several dozens of MΩ.
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Revalorization of Cotton and Cotton/Elastane Knitted Fabric Waste
Aleksandra Ivanovska,Jelena Lađarević,Koviljka Asanović,Leposava Pavun,Mirjana Kostić,Biljana Mangovska 한국섬유공학회 2023 Fibers and polymers Vol.24 No.2
The present paper demonstrates a simple way for revalorization of differently softened cotton and cotton/elastane knittedfabric waste collected from the textile industry. Such waste was used as an adsorbent for Congo Red (CR) dye, whereby upto 96% removal efficiency was reached. The CR adsorption process onto cationic and silicone softened fabrics is in conformitywith Langmuir (with maximum adsorption capacity of 12.533 mg/g) and Freundlich isotherms, respectively. Differentadsorption of CR onto cationic and silicone softened fabrics is ascribed to the different softeners’ fixation to them, whilethe adsorption of CR operates in the same manner, via hydrophobic interactions. The adsorption kinetic data follow thepseudo-second-order model, while the equilibrium was reached after 90 min. Additionally, this study proposed a new circulareconomy solution for the disposal of fabric waste with adsorbed CR generating additional revenues. The volume electricalresistivity measurements confirmed that the knitted fabric wastes with adsorbed CR have 169–737 times lower resistivities(0.008–0.037 GΩ·cm) than before the adsorption. The inversely proportional correlation between fabrics’ adsorptionefficiencies and their volume electrical resistivities after CR adsorption was found. Such knitted fabric waste with adsorbedCR could be defined as dissipative materials and could be used for providing antistatic protection.
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