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YILDIZ, ZEHRA

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YILDIZ

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2016 - 201922020 - 20211
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    Preparation of flame retardant epoxyacrylate-based adhesive formulations for textile applications
    (TAYLOR & FRANCIS LTD, 2016) YILDIZ, ZEHRA; Yildiz, Zehra; Onen, Aysen; Gungor, Atilla
    In this research, UV-curable acrylated epoxy-based oligomer adhesive formulations containing vinylphosphonic acid (VPA) were prepared to adhere cord fabrics onto the rubber surfaces. In order to enhance the peel strength between cord and rubber, an alkali treatment was applied onto the cord fabrics prior to the adhesive application process. Adhesive formulations and alkali-treated cords were characterized by Fourier transform infrared (FTIR) spectroscopy. By changing the VPA ratio in adhesive formulation, peel strength, flame retardancy, and thermal properties were evaluated. Results proved that the 10% VPA-included adhesive formulation provided highest char yield values supporting the flame retardancy property and the highest peel strength value of 50.8N/cm between the cord fabric and rubber surfaces.
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    Synthesis and characterization of UV-curable cellulose acetate butyrate-based oligomers and their cotton fabric coatings
    (SPRINGER, 2021) BOZTOPRAK, YALÇIN; Dehmen, Ozan Gazi; Onen, Hacer Aysen; Yildiz, Zehra; Gungor, Atilla; Boztoprak, Yalcin
    In order to improve the thermal stability and flexibility, cellulose acetate butyrate (CAB) was modified with toluene diisocyanate-hydroxyethyl methacrylate (TDI-HEMA) adduct in various molar ratios. The obtained oligomer was characterized by proton nuclear magnetic resonance (H-1 NMR) and Fourier transform infrared (FTIR) spectroscopies. Gloss, cross-hatch, contact angle, and Taber abrasion tests were all used to investigate the film forming performance of the modified CAB oligomers on glass plates. The UV-cured free films of the synthesized oligomers were examined in terms of the mechanical tests. By using the synthesized CAB oligomers, coating formulations were prepared and applied onto cotton fabrics in order to make the cotton fabrics more durable in outdoor environments. The existence of the coating layer on the fabric surfaces was investigated by scanning electron microscopy (SEM). The coated UV-cured fabrics were evaluated separately in terms of abrasion, thermal conductivity, and air and water vapor permeability properties. Results proved that the oligomer (50%-CAB) in which 50% of the hydroxyl groups of CAB were reacted with TDI-HEMA adduct showed the best mechanical properties with the highest tensile strength and modulus values. Considering the coated fabrics, the least deformation against abrasion, the highest air/water vapor permeability, and the best thermal conductivity were all recorded in 50%-CAB coated sample.
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    Dual-curable PVB based adhesive formulations for cord/rubber composites: The influence of reactive diluents
    (ELSEVIER SCI LTD, 2017) YILDIZ, ZEHRA; Yildiz, Zehra; Onen, Hacer Aysen
    In this study, the effects of reactive diluent type on the adhesion strength of cord/rubber surfaces were investigated. For this purpose, a urethane acrylate oligomer was synthesized by the reaction of 2,4-toluene diisocyanate (TDI), 2-hydroxyethyl methacrylate (HEMA) and polyvinyl butyral (PVB) in the presence of di-n-butyltin dilaurate (T12) as catalyst. The structure of the oligomer was characterized by nuclear magnetic resonance (NMR) spectroscopy. Then the oligomer was included in adhesive formulations together with trimethylolpropane trimethacrylate (TMPTMA) and tricyclodecane dimethanol diacrylate (TCDDA) as reactive diluents and thermal and photo initiator respectively. Polyester/polyamide cord fabrics were dipped into the adhesive solution and cured by UV-light. Then coated fabrics were characterized by Fourier transform infrared (FTIR) spectroscopy, differential scanning calorimetry (DSC) and thermal gravimetric analysis (TGA). Contact angle measurement was employed to investigate the wettability properties of the coated fabrics. Thermal curing between the coated fabric and rubber was performed under heat and pressure. The adhesion strength between the cord/rubber surfaces was determined by T-peel test. The highest adhesion strength of 100.4 N/cm with the lowest contact angle value of 70.2 were obtained in the sample containing TCDDA as reactive diluent, due to a higher functionality resulting in a greater crosslinking density.