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All Journal International Journal of Science and Environment
Rahmat Fajrul
Program Studi Sarjana Terapan, D Iv Teknik Mesin Produksi Dan Perawatan, Jurusan Teknik Mesin, Politeknik Negeri Bengkalis, Indonesia
Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Mathematics Physics

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Effect of Polyester and Vinylester Resin Blends on the Physical and Mechanical Properties of Reinforced Composites Coconut Coir Fiber Muhammad Restu Muhammad Restu; Rahmat Fajrul
International Journal of Science and Environment (IJSE) Vol. 6 No. 2 (2026): May 2026
Publisher : CV. Inara in Colaboration with www.stie-sampit.ac.id

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.51601/ijse.v6i2.749

Abstract

This study aims to determine the effect of polyester and vinylester resin blends on the physical and mechanical properties of coconut coir fiber-reinforced composites. Coconut coir fiber was selected due to its abundant availability, although its utilization remains limited. Composites were fabricated using the hand lay-up method with a matrix blend of 70% polyester resin and 30% vinylester resin, with fiber volume fractions of 0%, 5%, 10%, 15%, and 25% (PV0–PV25). Mechanical testing was conducted using a Universal Testing Machine referring to the ASTM D638 standard, while fracture morphology was characterized using Scanning Electron Microscopy (SEM). The results showed that the PV0 specimen exhibited the highest mechanical properties, with a Tensile Strength of 32.30 MPa, Yield Strength of 26.95 MPa, Elongation at Yield of 2.28%, and Tensile Stress at Break of 11.95 MPa. The addition of coconut coir fiber instead reduced the composite's mechanical properties, supported by SEM results revealing fiber pull-out and void formation in the fiber-reinforced specimens. These findings indicate that the quality of fiber-matrix interfacial bonding and the minimization of microdefects play a more critical role in determining mechanical performance than the fiber volume fraction itself.
The Effect of Banana Stem Fiber Mixtures on Mechanical and Physical Properties Using a Polyester and Vinylester Blend Matrix M Rifki ALKindi; Rahmat Fajrul; Murdani
International Journal of Science and Environment (IJSE) Vol. 6 No. 2 (2026): May 2026
Publisher : CV. Inara in Colaboration with www.stie-sampit.ac.id

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.51601/ijse.v6i2.750

Abstract

Natural fiber-reinforced composites continue to be developed as lightweight, economical, and environmentally friendly alternatives to metals and synthetic composites. One natural fiber with strong potential is banana stem fiber, which is easily obtained and helps reduce environmental waste. This study aims to determine the effect of adding banana stem fiber on the mechanical and physical properties of a composite using a mixed matrix of polyester resin (70%) and vinylester resin (30%). The composites were fabricated using the hand lay-up method with fiber mass variations of 0, 2, 5, 7, and 12 grams, and were subsequently tested for impact strength according to the ASTM D6110 standard. The results show that the addition of banana stem fiber significantly increased the impact strength of the composite. The specimen without fiber (0 grams) produced the lowest absorbed energy and impact strength values, while the 12-gram fiber variation showed the best performance, with an average absorbed energy of 11.66 Joules and the highest impact strength of 0.090 J/mm². Variations in values among specimens of the same composition are presumed to result from the hand lay-up fabrication process, such as uneven fiber distribution and the formation of voids. Overall, the composite with 12 grams of banana stem fiber in a 70% polyester–30% vinylester matrix was identified as the best composition in this study.
Co-Authors M Rifki ALKindi Muhammad Restu Muhammad Restu Murdani