Browsing by Author "Khalil, Heba M."

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    Improving transfer printing and ultraviolet-blocking properties of polyester-based textiles using MCT-beta-CD, chitosan and ethylenediamine
    (WILEY-BLACKWELL, 2010) Ibrahim, Nabil A.; El-Zairy, Enas M. R.; El-Zairy, Mohammed R.; Khalil, Heba M.
    This study demonstrates the possibility of improving the transfer printability and fastness properties, as well as the ultraviolet-protecting functionality, of polyester, polyester/wool, polyester/cotton and polyester/viscose woven fabrics via pretreatment with monochlorotriazinyl beta-cyclodextrin (MCT-beta-CD), chitosan or ethylenediamine, followed by subsequent transfer printing with sublimable disperse dyes. The modification variables as well as the transfer printing conditions were optimised. The experimental results reveal that generating hydrophobic cavities (via grafting of beta-CD) at the fabric surface, fixing of chitosan, with its amino groups, onto the finish/fabric matrix, or introducing amine functional groups, via aminolysis of the polyester component, results in obtaining transfer printed fabric samples with darker depth of shades and better fastness properties, as well as with higher ultraviolet-protecting functions. It was further noted that, in all cases, the enhancement in the imparted properties is governed by type of substrate, kind and extent of chemical modification, affinity for the sublimable disperse dyes, accessibility of generated hosting and fixing sites, as well as the ultraviolet-blocking capacities of the modified/post-printed substrates against damaging ultraviolet rays. The mode of interaction, as well as the surface morphology of some non-treated and treated fabric samples, was also investigated.
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    A new approach for durable multifunctional coating of PET fabric
    (ELSEVIER SCIENCE BV, PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS, 08/01/2018) Ibrahim, Nabil A.; Eid, Basma M.; Khalil, Heba M.; Almetwally, Alsaid A.
    This new approach aims to impart durable multifunctional properties to polyester fabric surface via premodification with sodium hydroxide followed by subsequent coating with proper active ingredients such as SiO2, TiO2, ZnO and ZrO2 nanoparticles using gelatin as a green binding agent. The obtained results signify that the enhancement in the imparted functional properties like antibacterial, UV-blocking, self-cleaning capability and softness properties is governed by type of binding agent, i.e. gelatin > polyacrylate as well as kind of included metal oxide nanoparticles (MO-NPs) into the coating paste. FTIR, SEM and EDS analysis confirm the surface modification and functionalization of PET fabric surface. The obtained multifunctional coatings exhibit a remarkable washing durability even after 15 washing cycles. (C) 2018 Elsevier B.V. All rights reserved.