Jibril Maulana, Rizka Sarah Heydarina Fathima Ahsan, Dewi'Izzatus Tsamroh, Eka Nurul Qomaliyah, Sis Nanda Kus Adrianto
The textile industry needs sustainable dyeing solutions to reduce the environmental impact of synthetic dyes. This research investigated coffee - a globally abundant natural resource - as a dual functional agent for dyeing while engineering mechanical properties in cotton (C24S) and polyester (PE24S) fabrics. The fabrics were treated with 1% coffee extract, then characterized using macro photos, FTIR, and mechanical strength tested strictly following ASTM D638 Type IV. Interestingly, coffee immersion can act as a bridging effect between fibers, thus slowing down tensile failure during testing process in cotton fabrics, while in polyester fabrics, it decreases the tensile strength, which is because the bond between PE and CBW makes agglomeration and PE fibers are randomly dispersed. Based on the FTIR results, the addition of CBW to the cotton and PE fabrics caused the organic intermolecular network to change, so it can be concluded that there is interaction between the polymer chains within the amorphous region of cotton and PE fabric network. Based on tensile test results, 1% coffee immersion significantly changed the tensile strength characteristics of the fabrics, which differed by fiber type. In PE 24S fabric, the tensile strength showed a decrease of 13%, but in C24S fabric, the tensile strength showed an increase of 1.11%. In contrast, polyester (PE24S) showed a plasticity-driven transformation, with elongation jumping by 214% and modulus decreasing by 72.5%, caused by the rearrangement of polymer chains. This work pioneers the reutilization of coffee waste beyond aesthetics, establishing a circular economy paradigm for functional textiles. © 2025 School of Science, DUTH. All rights reserved.
Department of Manufacturing Engineering Technology, Universitas Negeri Malang, Semarang Street No. 5, Malang, 65145, Indonesia; Department of Mode Design, Universitas Negeri Malang, Semarang Street No. 5, Malang, 65145, Indonesia; Department of Educational Science, Universitas Negeri Malang, Semarang Street No. 5, Malang, 65145, Indonesia
