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    EVALUATION OF THE EFFECT OF HEMP FIBERS ON THE PERFORMANCE PROPERTIES OF DENIM FABRICS
    (Editura Acad Romane, 2025) Bilgic, Hilal; Sezer, Gamze Okyay
    The aim of this study has been to investigate the potential of using hemp fibers in denim fabric structures as a sustainable alternative to traditional cotton. For this purpose, a total of 12 different types of denim fabric structures were produced, including reference and hemp-based denim fabrics, as well as flax-based fabrics to enrich the study. In the production of denim fabrics, traditional and organic cotton ring-spun yarns were used in the warp, while traditional cotton, organic cotton/bamboo/flax, and organic cotton/bamboo/hemp hybrid yarns were used in the weft direction. The air and water vapor permeability, antibacterial activity, surface resistance, and fastness properties of the produced denim fabric structures were investigated comparatively using statistical analysis methods. Upon examining the results, contrary to expectations, the air and water vapor permeability of the fabrics containing flax and hemp were found to be lower than that of the reference fabric. Additionally, all types of fabrics produced were found to exhibit no antibacterial activity against the tested organism Escherichia coli (ATCC 25922 gram-negative bacteria). When the fastness results (light, crocking, laundering, water, and perspiration) were evaluated, it was observed that both flax-and hemp-containing denim fabric samples demonstrated the same performance as the reference fabrics, and all the developed denim fabric structures met industrial requirements.
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    Experimental and ANN-based mechanical analysis of jute fiber-reinforced rHDPE sustainable composites
    (Taylor & Francis Ltd, 2026) Syduzzaman, Md.; Ahmed, A. T. M. Faiz; Rahman, Md. Redowanur; Sezer, Gamze Okyay; Eadul, Fazlul Haque; Hassan, Tanvir; Islam, Md. Jahirul
    High-density polyethylene (HDPE) waste poses a severe environmental threat, with only 9% recycled globally. This study develops sustainable composites by reinforcing recycled HDPE (rHDPE) with RUCOSTAR EEE6-treated jute fabric at 6 and 12 wt.% loadings. Two treatment concentrations (50 g/L and 70 g/L) were applied via dip-pad-dry-cure to enhance hydrophobicity and interfacial adhesion. Six composite variants were fabricated through compression molding, and their physical, mechanical, and hygroscopic properties were evaluated. The 70 g/L treatment significantly reduced water absorption (E70F12 < 3% vs. 9% for untreated RF12), while increasing density confirmed improved impregnation and reduced void content. Tensile tests revealed enhanced ductility (up to 34% higher strain at break) with modest strength trade-offs at 12 wt.% loading. A feed-forward artificial neural network (ANN) was developed to predict the stress-strain constitutive relationship sigma = f(epsilon), with hyperparameters selected via 5-fold cross-validation and stability assessed over ten reruns. The optimized model achieved median R >= 0.97 and MAE below 0.50 MPa on the held-out test set, outperforming polynomial fitting, SVR, and random forest. This hybrid experimental - computational approach demonstrates that EEE6-treated jute/rHDPE composites offer moisture-resistant, high-ductility green materials for structural applications.