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All Journal Abdi: Jurnal Pengabdian dan Pemberdayaan Masyarakat Quantum Teknika International Journal of Engineering, Science and Information Technology Jurnal Teknologi Sistem Informasi dan Sistem Komputer TGD Jurnal Masyarakat Madani Indonesia Indonesian Journal of Aerospace
Taufik Azhary
Universitas Nahdlatul Ulama Sunan Giri
Aerospace Engineering Humanities Astronomy Automotive Engineering Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Decision Sciences, Operations Research & Management Earth & Planetary Sciences Education Electrical & Electronics Engineering Energy Engineering Environmental Science Health Professions Industrial & Manufacturing Engineering Library & Information Science Materials Science & Nanotechnology Mathematics Mechanical Engineering Medicine & Pharmacology Physics Public Health Social Sciences Transportation

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Journal : Quantum Teknika

 1 
Effect of Layering and Fiber Orientation on The Tensile, Impact, and Flexural Properties of Polyester/Ramie Fiber Composites Maghzari Zaka Ahmad; Taufik Azhary; Pelangi Eka Yuwita
Quantum Teknika : Jurnal Teknik Mesin Terapan Vol. 7 No. 1 (2025): October
Publisher : Universitas Muhammadiyah Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.18196/jqt.v7i1.28402

Abstract

Natural fiber-based composite materials have recently emerged as a promising alternative to synthetic materials due to their eco-friendly characteristics and ability to provide good mechanical strength. One of the natural fibers with strong potential as reinforcement is ramie fiber, which, when combined with a polyester matrix, can produce strong yet lightweight composite materials. This study was conducted to evaluate the effect of fiber orientation and the number of layers on the mechanical properties of polyester (ramie fiber) composites. The specimens were fabricated using the hand lay-up method with three variations: without fiber, two layers of unidirectional fibers, and two layers of woven fibers. The test results revealed that the woven fiber specimens achieved the highest performance in the tensile test, with a tensile strength of 33.31 MPa and an elastic modulus of 1.8 GPa. In the flexural test, this specimen also recorded the highest stress of 16.39 MPa and a flexural modulus of 58.3 MPa. The impact test showed that the woven fiber specimen had the highest energy absorption capacity of 4.97 Joules and an impact strength of 130.46. Overall, the use of woven ramie fibers significantly enhanced the tensile strength and impact toughness of the composite. Nevertheless, the effectiveness of reinforcement strongly depends on the proper arrangement and distribution of the fibers.
Mechanical and Thermal Properties of Cellulose Nanofiber-Reinforced Polypropylene Composites Compatibilized with PP-g-MA Azhary, Taufik; Azhar, Faruq Avero
Quantum Teknika : Jurnal Teknik Mesin Terapan Vol. 7 No. 2 (2026): April
Publisher : Universitas Muhammadiyah Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.18196/jqt.v7i2.28974

Abstract

Polypropylene is widely used in the automotive industry because it is lightweight, inexpensive, and easy to process, but it has limitations, including relatively low mechanical properties and a tendency to shrink. Cellulose nanofiber is used as an environmentally friendly reinforcement with high strength, but differences in properties between hydrophobic polypropylene and hydrophilic CNF result in poor compatibility. To overcome this, a polypropylene-graft-maleic anhydride (PP-g-MA) coupling agent is added to enhance interfacial bonding. This study aims to evaluate the effects of CNF and PP-g-MA content on the mechanical properties, thermal stability, and water resistance of polypropylene materials produced by extrusion and injection molding. The outcomes show that substituting 1 wt% CNF provides significant reinforcement, elevating the tensile strength to 22.90 MPa and the flexural strength to 29.70 MPa. At higher CNF contents, agglomeration occurs, leading to decreased mechanical properties and increased water absorption up to 0.35%. The substitution of PP-g-MA increased the compatibility of the PP/CNF composite, as indicated by the appearance of an ester peak in the FTIR, an increase in crystallinity in the DSC/XRD, and a shift in the onset of degradation by 340°C to 350°C in the PP/1CNF/5PP-g-MA composite. This formulation also produced a tensile strength of 25.60 MPa, a flexural strength of 33.00 MPa, and low water absorption. Although substituting CNF reduced impact strength, using PP-g-MA restored impact strength to near that of pure polypropylene. Overall, the PP/1CNF/5PP-g-MA composite was determined to be the optimal composition due to its balanced mechanical properties, thermal stability, and water resistance.
Co-Authors Abdul Basith Afril Efan Pajri Agus Sulistiawan Ahmad Taufiqqurohman Ainu Zuhriyah Andry Renaldy Pandie, Andry Renaldy Faiz Ardiansyah Faruq Avero Azhar Kirillov, Aleksey Vladimirovich Maghzari Zaka Ahmad Mohamad Da'i Mohammad Agung Prayitno Mohammad Anshori Pelangi Eka Yuwita Sutriawan Uud Setiyo Mujiharto