Modification of cellulosic fibers by UV-irradiation. Part II: After treatments effects

Zuber, Mohammad; Zia, Khalid Mahmood; Bhatti, Ijaz Ahmad; Ali, Zobia; Arshad, Muhammad Umair; Saif, Muhammad Jawwad

doi:10.1016/j.ijbiomac.2012.07.001

Cited by 33 publications

(11 citation statements)

References 30 publications

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“…UV radiation can improve the value of dyeing and printing. The UV modification of surface fiber can allow more dye to be fixed, gives deeper shades and can improve wettability of fabrics 9,10 . It increases the printability of the fabric and reduces pilling as well as improve water repellent properties of cotton.…”

Section: Ecofriendly Dyeing Of Uv-irradiated Cotton Using Extracts Ofmentioning

confidence: 99%

Ecofriendly Dyeing of UV-Irradiated Cotton Using Extracts of Acacia nilotica Bark (Kikar) as Source of Quercetin

Adeel¹,

Fazal-ur-Rehman²,

Hanif³

et al. 2014

Asian J. Chem.

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Increasing awareness about safe products in textiles has developed the worldwide choice in natural colour based textiles. For the present study, barks of Acacia nilotica (Kikar) has been selected as source of natural flavone dye (querecetin). Both cotton fabrics and dye powder were exposed to UV radiations for 30, 45, 60, 90 and 120 min. Later on the dye was extracted using irradiated (RP) and un-irradiated dye powder (NRP) followed by dyeing of irradiated (RC) and un-irradiated fabric (NRC). Different dyeing variables such as temperature, time, pH, liquor concentration (M:L) and electrolyte concentration were optimized and dyeing was performed at these optimum coniditions. To improve colour strength and colour fastness properties different concentrations of mordants such as Cu (copper sulphate), Al (aluminum sulphate), Fe (iron sulphate) and tannic acid were employed. ISO standard methods were employed to determine the colour fastness to light, washing and rubbing to observe the effect of UV radiation on these fastness properties. The fabrics investigated in CIE Lab system using spectraflash showed that exposure for 90 min modifies the surface of fabric and dyeing for 50 min at 55 ºC, using 8 g/100 mL of salt using dye bath of pH 6 provides the best colour strength. It is also found that iron is the best mordant among other used that improves the colour fastness properties from moderate to good.

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Section: Ecofriendly Dyeing Of Uv-irradiated Cotton Using Extracts Ofmentioning

confidence: 99%

Ecofriendly Dyeing of UV-Irradiated Cotton Using Extracts of Acacia nilotica Bark (Kikar) as Source of Quercetin

Adeel¹,

Fazal-ur-Rehman²,

Hanif³

et al. 2014

Asian J. Chem.

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“…The ozone formed at 185 nm can react with the free radicals of the activated surface and increases the concentration of oxygen on the surface of the fiber. The higher concentration of oxygen leads to stronger bonding of the fiber to the matrix [10,24].…”

Section: Uv-light Treatmentmentioning

confidence: 99%

Demonstration of Hybrid Effect in Single Fiber Pull-Out Tests for Glass/Cellulose-Reinforced Polypropylene with Different Fiber–Matrix Adhesions

2022

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In hybrid fiber reinforcement, the combination of glass and regenerated cellulose fibers is a promising combination because the different properties of the fibers can be combined. The properties of the regenerated cellulose fiber in combination with the absorption of energy by fiber pull-outs can thus significantly increase the toughness of the composite in the event of failure, while the glass fiber significantly increases the stiffness and strength due to its properties. In this study, the interaction of the two fiber types in a composite is demonstrated by fiber pull-outs. For this purpose, the fibers are embedded in a PP matrix and simultaneously pulled out. Different bondings of the fiber by, e.g., coupling agent and/or a pretreatment of the regenerated cellulose fiber, were also investigated. The results show that each type of fiber has a characteristic force–deformation curve, and the hybrid reinforcement is a combination of both curves. The use of a coupling agent leads to an increase in the interfacial shear stress from 4.5 to 7.5 MPa. A treatment of the regenerated cellulose fiber by UV light further increases the interfacial shear stress to 11 MPa.

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“…Another widely used pre-treatment is the bleaching, which uses chlorinated compounds or hydrogen peroxide in intention to obtain pulp with greater whiteness. This process reduces or removes lignin from the pulp, possibly causing an increase in the cellulose content, chemical reactivity, dimensional stability, tensile properties, and roughness (Zuber et al, 2012). Due to pollutant production issues, chlorinated compounds are being avoided at this stage.…”

Section: Introductionmentioning

confidence: 99%

Bio-based films/nanopapers of banana tree pseudostem: From lignocellulosic wastes to added-value micro/nanomaterials

Guimarães

Scatolino

Martins

et al. 2021

Preprint

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The growing demand for products with lower environmental impact and the extensive applicability of cellulose nanofibrils (CNFs) have received attention in several fields of knowledge due to their attractive properties. In this study, bio-based films/nanopapers were produced with CNFs from banana tree pseudostem (BTPT) wastes and Eucalyptus kraft cellulose (EKC) and were evaluated by their properties, such as mechanical strength, biodegradability and light transmittance. The CNFs were produced by mechanical fibrillation (after 20 and 40 passages) from suspensions of BTPT (alkaline pre-treated) and EKC. Films/nanopapers were produced by casting from both suspensions with concentrations of 2% (based in dry mass of CNF). The BTPT films/nanopapers showed greater mechanical properties, with Young’s modulus and tensile strength around 2.42 GPa and 51 MPa (after 40 passages), respectively. On the other hand, the EKC samples showed lower disintegration in water after 24 h and biodegradability. The increase in the number of fibrillation cycles produced more transparent films/nanopapers and caused a significant reduction of water absorption for both raw materials. The permeability was similar for the films/nanopapers from BTPT and EKC. This study indicated that attractive mechanical properties and biodegradability could be achieved by bio-based nanomaterials, with potential for being applied as emulsifying agents and special membranes, enabling more efficient utilization of agricultural wastes.

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Modification of cellulosic fibers by UV-irradiation. Part II: After treatments effects

Cited by 33 publications

References 30 publications

Ecofriendly Dyeing of UV-Irradiated Cotton Using Extracts of Acacia nilotica Bark (Kikar) as Source of Quercetin

Ecofriendly Dyeing of UV-Irradiated Cotton Using Extracts of Acacia nilotica Bark (Kikar) as Source of Quercetin

Demonstration of Hybrid Effect in Single Fiber Pull-Out Tests for Glass/Cellulose-Reinforced Polypropylene with Different Fiber–Matrix Adhesions

Bio-based films/nanopapers of banana tree pseudostem: From lignocellulosic wastes to added-value micro/nanomaterials

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