Epoxy/unsaturated polyester blends via post-curing process for marine applications

Fahriadi Pakaya; Yurika Nantan; Marinus S. Tappy; Raman GTH Simanjuntak; Jozua Ch. Huwae; M. Yusuf Syam; Izhary Siregar; I Nyoman Subawa; Wilfred Yan Krol Urun

doi:10.62870/tjst.v21i1.29745

Epoxy/unsaturated polyester blends via post-curing process for marine applications

Fahriadi Pakaya, Yurika Nantan, Marinus S. Tappy, Raman GTH Simanjuntak, Jozua Ch. Huwae, M. Yusuf Syam, Izhary Siregar, I Nyoman Subawa, Wilfred Yan Krol Urun

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.

Keywords

Epoxy resin; Mechanical properties; Polymer blends; Post-curing; Unsaturated polyester

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References

N. Ramadan, M. Taha, A. D. La Rosa, and A. Elsabbagh, “Towards selection charts for epoxy resin, unsaturated polyester resin and their fibre-fabric composites with flame retardants,” Materials, vol. 14, no. 5, p. 1181, 2021, doi: 10.3390/ma14051181.

N. Gökçe, M. Nodehi, D. Ramazanoğlu, S. Subaşi, O. Gencel, and T. Ozbakkaloglu, “Engineering properties of hybrid polymer composites produced with different unsaturated polyesters and hybrid epoxy,” J. Build. Eng., vol. 89, p. 109334, 2024, doi: 10.1016/j.jobe.2024.109334.

B. K. Kandola, L. Krishnan, J. R. Ebdon, and P. Myler, “Structure-property relationships in structural glass fibre reinforced composites from unsaturated polyester and inherently fire retardant phenolic resin matrix blends,” Compos. Part B Eng., vol. 182, p. 107607, 2020, doi: 10.1016/j.compositesb.2019.107607.

Y. J. V. Ruban, S. G. Mon, and D. V. Roy, “Processing and thermal/mechanical studies of unsaturated polyester toughened epoxy composites filled with amine functionalized carbon nanotubes,” Int. J. Plast. Technol., vol. 15, no. 2, pp. 133–149, 2011, doi: 10.1007/s12588-012-9019-3.

F. Rubino, A. Nisticò, F. Tucci, and P. Carlone, “Marine application of fiber reinforced composites: A review,” J. Mar. Sci. Eng., vol. 8, no. 1, p. 26, 2020, doi: 10.3390/jmse8010026.

H. Liang, X. Shi, and Y. Li, “Technologies in marine antifouling and anti-corrosion coatings: A comprehensive review,” Coatings, vol. 14, no. 12, p. 1487, 2024, doi: 10.3390/coatings14121487.

I. Sabry, “Enhanced strength, ductility, and corrosion resistance of AA6061/AA6082 alloys using Al-SiC matrix reinforcement in dissimilar friction stir welding,” Int. J. Adv. Manuf. Technol., vol. 134, no. 5-6, pp. 2431–2457, 2025, doi: 10.1007/s00170-025-15627-3.

H. Yi, M. Zhang, D. Zao, and W. Gong, “Thermal, mechanical, and tribological properties of epoxy polymer/EPU blends reinforced by low concentration of octaaminophenyl POSS,” Polym. Eng. Sci., vol. 61, no. 3, pp. 780–792, 2021, doi: 10.1002/pen.25620.

X. Huang, Y.-T. Guo, X.-M. Yan, G.-Q. Yin, and G.-Z. Feng, “A new type of unsaturated polyester resin with epoxy functionalized nano-silica and dimer fatty acid: Preparation and property,” Polym. Adv. Technol., vol. 33, no. 8, pp. 2459–2469, 2022, doi: 10.1002/pat.5701.

K. V. P. Chakradhar, K. V. Subbaiah, M. A. Kumar, and G. R. Reddy, “Blended epoxy/polyester polymer nanocomposites: Effect of ‘nano’ on mechanical properties,” Polym.-Plast. Technol. Eng., vol. 51, no. 1, pp. 92–96, 2012, doi: 10.1080/03602559.2011.618157.

Z. Wu et al., “Visualization of macrophase separation and transformation in immiscible polymer blends,” CCS Chem., vol. 5, no. 3, pp. 718–728, 2023, doi: 10.31635/ccschem.022.202101726.

T. Dinesh, A. Kadirvel, and A. Vincent, “Effect of silane modified E-glass fibre/iron(III)oxide reinforcements on UP blended epoxy resin hybrid composite,” Silicon, vol. 11, no. 5, pp. 2487–2498, 2019, doi: 10.1007/s12633-018-9886-0.

J. Shi, X. Zhang, L. Liu, L. Weng, S. Yan, and S. Zhang, “Evaluation of low dielectric constant epoxy vinyl ester resin modified by hyperbranched unsaturated polyester of acroleic acid and n-hexanoic acid co-blocking,” J. Mater. Sci. Mater. Electron., vol. 31, no. 12, pp. 9176–9184, 2020, doi: 10.1007/s10854-020-03447-y.

M. R. Vengatesan, A. M. Varghese, and V. Mittal, “Thermal properties of thermoset polymers,” in Thermosets: Structure, Properties, and Applications, 2nd ed., Q. Guo, Ed. Oxford, UK: Elsevier, 2018, pp. 69–114.

N. R. Paluvai, S. Mohanty, and S. K. Nayak, “Unsaturated polyester-toughened epoxy composites: Effect of sisal fiber on thermal and dynamic mechanical properties,” J. Vinyl Addit. Technol., vol. 23, no. 3, pp. 188–199, 2017, doi: 10.1002/vnl.21491.

N. Alallak, “Effect of heat treatment on tensile strength, hardness and thermal conductivity of blended polymer composite,” in Proc. Mater. Sci. Forum, 2012, vol. 706–709, pp. 625–630, doi: 10.4028/www.scientific.net/MSF.706-709.625.

A. S. Ismail, M. Jawaid, N. H. Hamid, R. Yahaya, and A. Hassan, “Mechanical and morphological properties of bio-phenolic/epoxy polymer blends,” Molecules, vol. 26, no. 4, p. 773, 2021, doi: 10.3390/molecules26040773.

N. R. Paluvai, S. Mohanty, and S. K. Nayak, “Effect of nanoclay on the mechanical, thermal, and water absorption properties of an UP-toughened epoxy network,” J. Adhes., vol. 92, no. 10, pp. 840–861, 2016, doi: 10.1080/00218464.2015.1047828.

M. Worzakowska, “Synthesis, characterization, thermal, and viscoelastic properties of an unsaturated epoxy polyester cured with different hardeners,” J. Appl. Polym. Sci., vol. 110, no. 6, pp. 3582–3589, 2008, doi: 10.1002/app.28931.

A. A. Firoozi, A. A. Firoozi, D. O. Oyejobi, S. Avudaiappan, and E. S. Flores, “Enhanced durability and environmental sustainability in marine infrastructure: Innovations in anti-corrosive coating technologies,” Results Eng., vol. 26, p. 105144, 2025, doi: 10.1016/j.rineng.2025.105144.

D. Ma, M. Zhang, and J. Cui, “A review on the deterioration of mechanical and durability performance of marine-concrete under the scouring action,” J. Build. Eng., vol. 66, p. 105924, 2023, doi: 10.1016/j.jobe.2023.105924.

D. P. Islami et al., “Structural design parameters of laminated composites for marine applications: Milestone study and extended review on current technology and engineering,” Results Eng., vol. 24, p. 103195, 2024, doi: 10.1016/j.rineng.2024.103195.

O. El Hawary, L. Boccarusso, M. P. Ansell, M. Durante, and F. Pinto, “An overview of natural fiber composites for marine applications,” J. Mar. Sci. Eng., vol. 11, no. 5, p. 1076, 2023, doi: 10.3390/jmse11051076.

M. G. González, J. C. Cabanelas, and J. Baselga, “Applications of FTIR on epoxy resins - identification, monitoring the curing process, phase separation and water uptake,” in Infrared Spectroscopy - Materials Science, Engineering and Technology, T. Theophanides, Ed. London, UK: IntechOpen, 2012, doi: 10.5772/36323.

P. Yammine et al., “Types of crosslinkers and their applications in biomaterials and biomembranes,” Chemistry, vol. 7, no. 2, pp. 1–39, 2025, doi: 10.3390/chemistry7020061.

A. Shundo, S. Yamamoto, and K. Tanaka, “Network formation and physical properties of epoxy resins for future practical applications,” JACS Au, vol. 2, no. 7, pp. 1522–1542, 2022, doi: 10.1021/jacsau.2c00120.

M. Gao, D. Rong, C. G. Song, and Y. W. Ji, “The thermal properties of unsaturated polyester resin treated with intumescent flame retardants,” in Proc. Adv. Mater. Res., 2014, vol. 983, pp. 52–55, doi: 10.4028/www.scientific.net/AMR.983.52.

Y. J. Ruban, S. G. Mon, and D. V. Roy, “Mechanical and thermal studies of unsaturated polyester-toughened epoxy composites filled with amine-functionalized nanosilica,” Appl. Nanosci., vol. 3, no. 1, pp. 7–12, 2013, doi: 10.1007/s13204-012-0068-x.

H. Kishi, S. Matsuda, J. Imade, Y. Shimoda, T. Nakagawa, and Y. Furukawa, “The effects of the toughening mechanism and the molecular weights between cross-links on the fatigue resistance of epoxy polymer blends,” Polymer, vol. 223, p. 123712, 2021, doi: 10.1016/j.polymer.2021.123712.

F. Pakaya, H. Ardhyananta, and S. T. Wicaksono, “Mechanical properties and thermal stability of epoxy/RTV silicone rubber,” IPTEK J. Technol. Sci., vol. 28, no. 1, p. 7, 2017, doi: 10.12962/j20882033.v28i1.2216.

Y. Pang, D. Cho, O. H. Seong, and H. P. Won, “Interfacial shear strength and thermal properties of electron beam-treated henequen fibers reinforced unsaturated polyester composites,” Macromol. Res., vol. 13, no. 5, pp. 453–459, 2005, doi: 10.1007/BF03218480.

S. A. Greene, “M,” in International Resources Guide to Hazardous Chemicals, S. A. Greene, Ed. Oxford, UK: William Andrew Publishing, 2003, pp. 84–95.

DOI: http://dx.doi.org/10.62870/tjst.v21i1.29745

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