Interfacial modification of high-loading sugar palm fiber/unsaturated polyester biocomposites using alkali–vinyltrimethoxysilane treatment

Fahriadi Pakaya; Yurika Nantan; Marinus S. Tappy; I Nyoman Subawa

doi:10.30811/jpl.v24i3.8946

Interfacial modification of high-loading sugar palm fiber/unsaturated polyester biocomposites using alkali–vinyltrimethoxysilane treatment

Fahriadi Pakaya, Yurika Nantan, Marinus S. Tappy, I Nyoman Subawa

Abstract

Natural fiber-reinforced polyester biocomposites are promising lightweight materials, but their performance is often limited by weak fiber–matrix interaction, especially at high fiber loading. This study investigates the effect of combined alkali–Vinyltrimethoxysilane (VTMS) treatment on the flexural and physical properties of sugar palm fiber-reinforced Unsaturated Polyester Resin (UPR) biocomposites. Untreated fiber composites (IU/UPR), NaOH-treated fiber composites (IA/UPR), and NaOH–VTMS-treated fiber composites (IAS/UPR) were fabricated using the hand lay-up method at fiber loadings of 0–50 wt.%. The results showed that IAS/UPR exhibited the best overall performance, particularly at 50 wt.% fiber loading, achieving a flexural strength of 110.59 MPa, compared with 37.20 MPa for IU/UPR and 50.60 MPa for IA/UPR. IAS/UPR also showed lower water absorption, higher density, and lower porosity. Two-way ANOVA confirmed that fiber treatment, fiber loading, and their interaction significantly affected flexural strength, water absorption, and porosity. FTIR analysis indicated the reduction of hemicellulose and lignin-related components, while SEM observations showed improved matrix coverage, fewer interfacial gaps, and reduced fiber pull-out. These results indicate that alkali–VTMS treatment improves interfacial compatibility and extends the effective fiber-loading range of sugar palm fiber/UPR biocomposites.

Keywords

Alkali treatment; flexural strength; physical properties; sugar palm fiber; unsaturated polyester resin

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References

C. Iswan, B. Maryanti, and K. Arifin, “Analisis Perbandingan Kekuatan Variasi Fraksi Volume Komposit Serat Ijuk Terhadap Sifat Mekanis Komposit Dengan Matriks Resin Epoksi,” presented at the SNITT- Politeknik Negeri Balikpapan 2018, 2018.

D. A. Ramadhan, F. Putri, and D. Arnoldi, “Analisis Ketangguhan Material Alternatif Komposit Serat Ijuk dan Resin Polyester Sebagai Cover Body Motor,” Jun. 2021, doi: 10.5281/ZENODO.5812356.

Laily Ulfiyah, Faizatur Rohmah, Tristiandinda Permata, and Yopi Ariyanto, “Analisa Sifat Mekanik Paduan Serat Ijuk Dan Serat Jerami Sebagai Pengganti Serat Sintetis Pada Body Mobil,” J. Rekayasa Mater. Manufaktur Dan Energi, vol. 4, no. 2, Sep. 2021, doi: 10.30596/rmme.v4i2.8072.

R. D. Widodo, F. A. N. Susetyo, R. Rusiyanto, K. Kriswanto, and F. B. Darsono, “Kekuatan Tarik dan Bending Komposit Berpenguat Serat Arengga Pinnata Bermatriks Epoksi Berbasis Fraksi Volume dan Orientasi Serat,” Media Mesin Maj. Tek. Mesin, vol. 23, no. 1, pp. 1–12, Jan. 2022, doi: 10.23917/mesin.v23i1.15791.

A. Karthik, M. Bhuvaneshwaran, M. S. Senthil Kumar, S. Palanisamy, M. Palaniappan, and N. Ayrilmis, “A Review on Surface Modification of Plant Fibers for Enhancing Properties of Biocomposites,” ChemistrySelect, vol. 9, no. 21, p. e202400650, Jun. 2024, doi: 10.1002/slct.202400650.

K. Li, R. Qiu, and W. Liu, “Improvement of Interfacial Adhesion in Natural Plant Fiber-reinforced Unsaturated Polyester Composites: A Critical Review,” Rev. Adhes. Adhes., vol. 3, no. 1, pp. 98–120, Mar. 2015, doi: 10.7569/RAA.2015.097301.

A. A. Mohammed, D. Bachtiar, M. R. M. Rejab, S. F. Hasany, and J. P. Siregar, “Influence of Different Sugar Palm Fiber Content on the Tensile, Flexural, Impact, and Physicochemical Properties of Eco-Friendly Thermoplastic Polyurethane,” Theor. Found. Chem. Eng., vol. 53, no. 3, pp. 454–462, May 2019, doi: 10.1134/S0040579519030072.

D. Ginting and R. N. Fitri, “Efek Sintesis Silane Coupling Agent Pada Sifat Fisis dan Mekanis Komposit Serbuk Kenaf,” J. Fis. Fis. Sains Dan Apl., vol. 6, no. 2, pp. 113–117, Oct. 2021, doi: 10.35508/fisa.v6i2.6841.

S. Hastuti, H. S. Budiono, D. I. Ivadiyanto, and M. N. Nahar, “Peningkatan Sifat Mekanik Komposit Serat Alam Limbah Sabut Kelapa (Cocofiber) yang Biodegradable,” Reka Buana J. Ilm. Tek. Sipil Dan Tek. Kim., vol. 6, no. 1, pp. 30–37, Mar. 2021, doi: 10.33366/rekabuana.v6i1.2257.

S. K. Ramamoorthy, M. Skrifvars, and M. Rissanen, “Effect of alkali and silane surface treatments on regenerated cellulose fibre type (Lyocell) intended for composites,” Cellulose, vol. 22, no. 1, pp. 637–654, Feb. 2015, doi: 10.1007/s10570-014-0526-6.

O. Fadele, I. N. A. Oguocha, A. G. Odeshi, M. Soleimani, and L. G. Tabil, “Effect of chemical treatments on properties of raffia palm (Raphia farinifera) fibers,” Cellulose, vol. 26, no. 18, pp. 9463–9482, Dec. 2019, doi: 10.1007/s10570-019-02764-8.

Md. S. Islam, Z. A. Talib, A. K. Azad, and A. Kaiser, “Chemical Modifications and Properties of Coir Fibers Biocomposites,” in Agricultural Biomass Based Potential Materials, K. R. Hakeem, M. Jawaid, and O. Y. Alothman, Eds., Cham: Springer International Publishing, 2015, pp. 491–505, doi: 10.1007/978-3-319-13847-3_23.

F. Pakaya et al., “Arenga pinnata Merr. Reinforced Polyester Biocomposite as a Candidate Material for Fishing Vessel Hull: Mechanical Properties Analysis,” Marit. Park J. Marit. Technol. Soc., May 2025, doi: 10.62012/mp.vi.43650.

M. N. Norizan, K. Abdan, M. S. Salit, and R. Mohamed, “Physical, Mechanical and Thermal Properties of Sugar Palm Yarn Fibre Loading on Reinforced Unsaturated Polyester Composites,” J. Phys. Sci., vol. 28, no. 3, Nov. 2017, doi: 10.21315/jps2017.28.3.8.

R. M. Shahroze et al., “Sugar palm fiber/polyester nanocomposites: Influence of adding nanoclay fillers on thermal, dynamic mechanical, and physical properties,” J. Vinyl Addit. Technol., vol. 26, no. 3, pp. 236–243, Aug. 2020, doi: 10.1002/vnl.21736.

M. N. Norizan, K. Abdan, M. S. Salit, and R. Mohamed, “The Effect of Alkaline Treatment on the Mechanical Properties of Treated Sugar Palm Yarn Fibre Reinforced Unsaturated Polyester Composites Reinforced with Different Fibre loadings of Sugar Palm Fibre,” Sains Malays., vol. 47, no. 4, pp. 699–705, Apr. 2018, doi: 10.17576/jsm-2018-4704-07.

A. Atiqah, M. Jawaid, S. M. Sapuan, and M. R. Ishak, “Effect of Surface Treatment on the Mechanical Properties of Sugar Palm/Glass Fiber-reinforced Thermoplastic Polyurethane Hybrid Composites,” BioResources, vol. 13, no. 1, pp. 1174–1188, Dec. 2017, doi: 10.15376/biores.13.1.1174-1188.

A. Atiqah, M. Jawaid, S. M. Sapuan, M. R. Ishak, M. N. M. Ansari, and R. A. Ilyas, “Physical and thermal properties of treated sugar palm/glass fibre reinforced thermoplastic polyurethane hybrid composites,” J. Mater. Res. Technol., vol. 8, no. 5, pp. 3726–3732, Sep. 2019, doi: 10.1016/j.jmrt.2019.06.032.

I. Mukhtar, Z. Leman, E. S. Zainudin, and M. R. Ishak, “Hybrid and Nonhybrid Laminate Composites of Sugar Palm and Glass Fibre-Reinforced Polypropylene: Effect of Alkali and Sodium Bicarbonate Treatments,” Int. J. Polym. Sci., vol. 2019, pp. 1–12, Apr. 2019, doi: 10.1155/2019/1230592.

N. M. Nurazzi, A. Khalina, S. M. Sapuan, and R. A. Ilyas, “Mechanical properties of sugar palm yarn/woven glass fiber reinforced unsaturated polyester composites: effect of fiber loadings and alkaline treatment,” Polimery, vol. 64, pp. 665–675, 2019, doi: 10.14314/polimery.2019.10.3.

N. M. Nurazzi, “Effect of fiber orientation and fiber loading on the mechanical and thermal properties of sugar palm yarn fiber reinforced unsaturated polyester resin composites,” Polimery, vol. 65, no. 2, pp. 115–124, 2020, doi: 10.14314/polimery.2020.2.5.

N. M. Nurazzi, A. Khalina, S. M. Sapuan, R. A. Ilyas, S. A. Rafiqah, and Z. M. Hanafee, “Thermal properties of treated sugar palm yarn/glass fiber reinforced unsaturated polyester hybrid composites,” J. Mater. Res. Technol., vol. 9, no. 2, pp. 1606–1618, Mar. 2020, doi: 10.1016/j.jmrt.2019.11.086.

J. H. Aurer and A. Kasper, Unsaturated Polyester Resins. in 1. BÜFA Reaktionsharze GmbH & Co. KG and DSM Composite Resins AG, 2003.

F. Fatkhurrohman, I. Ismail, and F. Yudhanto, “Analisis Kekuatan Bending Komposit Lamina Serat Ijuk Anyam dan Serat Ijuk Acak bermatriks Polyester,” Quantum Tek. J. Tek. Mesin Terap., vol. 4, no. 1, pp. 55–61, Dec. 2022, doi: 10.18196/jqt.v4i1.16593.

A. M. N. Maisara, R. A. Ilyas, S. M. Sapuan, M. R. M. Huzaifah, N. M. Nurazzi, and S. O. A. SaifulAzry, “Effect of Fibre Length and Sea Water Treatment on Mechanical Properties of Sugar Palm Fibre Reinforced Unsaturated Polyester Composites,” Int. J. Recent Technol. Eng., vol. 8, no. 2S4, pp. 510–514, Aug. 2019, doi: 10.35940/ijrte.B1100.0782S419.

S. Sudarisman, S. Hamdan, H. Sosiati, and K. Krisdiyanto, “The effect of hybrid ratio on the flexural properties of Arenga Pinnata fiber/E-glass fiber/polyester hybrid composites,” J. Appl. Res. Technol., vol.22, n.1, pp.59-66, 2024, doi: 10.22201/icat.24486736e.2024.22.1.2176

M. R. M. Asyraf et al., “Sugar Palm Fibre-Reinforced Polymer Composites: Influence of Chemical Treatments on Its Mechanical Properties,” Materials, vol. 15, no. 11, p. 3852, May 2022, doi: 10.3390/ma15113852.

F. S. M. Radzi et al., “Effect of reinforcement of Alkaline-treated sugar palm/bamboo/kenaf and fibreglass/ Kevlar with polyester hybrid biocomposites: mechanical, morphological, and water absorption properties,” J. Mater. Res. Technol., vol. 24, 2023, doi: 10.1016/j.jmrt.2023.04.055.

M. R. M. Huzaifah, S. M. Sapuan, Z. Leman, and M. R. Ishak, “Effect of Fibre Loading on the Physical, Mechanical and Thermal Properties of Sugar Palm Fibre Reinforced Vinyl Ester Composites,” Fibers Polym., vol. 20, no. 5, pp. 1077–1084, May 2019, doi: 10.1007/s12221-019-1040-0.

R. Srinivasan, S. P. M, R. G, and M. A. Murugan, “Influence of alkali–silane treatment on pistachio shell lignin and sunn hemp fiber-reinforced epoxy bio-composites: A characterization approach,” J. Therm. Anal. Calorim., vol. 150, no. 26, pp. 21479–21489, Dec. 2025, doi: 10.1007/s10973-025-15045-3.

DOI: http://dx.doi.org/10.30811/jpl.v24i3.8946