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All Journal Teknika: Jurnal Sains dan Teknologi
Simanjuntak, Raman GTH
Department of Fisheries Mechanization, Marine and Fisheries Polytechnic Bitung
Chemical Engineering, Chemistry & Bioengineering Civil Engineering, Building, Construction & Architecture Electrical & Electronics Engineering Engineering Industrial & Manufacturing Engineering

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Epoxy/unsaturated polyester blends via post-curing process for marine applications Pakaya, Fahriadi; Nantan, Yurika; Tappy, Marinus S.; Simanjuntak, Raman GTH; Huwae, Jozua Ch.; Syam, M. Yusuf; Siregar, Izhary; Subawa, I Nyoman; Urun, Wilfred Yan Krol
Jurnal Teknika Vol 21, No 1 (2025): June 2025
Publisher : Faculty of Engineering, Universitas Sultan Ageng Tirtayasa

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.62870/tjst.v21i1.29745

Abstract

Epoxy resins and unsaturated polyester resins are widely used thermosetting polymers with applications in construction, electronics, and maritime industries. However, their respective limitations, such as brittleness in epoxy and reduced mechanical strength in unsaturated polyester, hinder their broader utilization. To address these challenges, blending the two polymers offers a promising approach to enhance their performance. This study investigates the mechanical and thermal properties of epoxy/unsaturated polyester blends enhanced through a post-curing process with stepwise temperature increases. The blends were characterized using FTIR, tensile, impact, and hardness tests in accordance with ASTM standards. Results demonstrate a synergy between the two polymers, with certain compositions (e.g., 90% epoxy/10% unsaturated polyester) achieving improved tensile strength, flexibility, and impact resistance. The highest tensile strength (54.45 N/mm²) was recorded in blends with > 50% unsaturated polyester, while optimal impact toughness (0.1438 J/mm²) was achieved with 90% epoxy and 10% unsaturated polyester. FTIR analysis revealed specific interactions between functional groups that contribute to the improved properties. These findings highlight the potential of epoxy/unsaturated polyester blends for demanding industrial applications, particularly in marine environments requiring high thermal stability and mechanical performance.
Co-Authors Huwae, Jozua Ch. Nantan, Yurika Pakaya, Fahriadi Siregar, Izhary Subawa, I Nyoman Syam, M. Yusuf Tappy, Marinus S. Urun, Wilfred Yan Krol