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All Journal Jurnal Polimesin
Kartika Sari
Jenderal Soedirman University, Author Scopus ID:57190937373
Automotive Engineering Control & Systems Engineering Engineering Materials Science & Nanotechnology Mechanical Engineering

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Effect of palm fiber volume fraction for enhancing the physical and mechanical properties of epoxy composites Kartika Sari; Sunardi -; Yazid Zainur Isnen; Agung Bambang Setio Utomo; Parmin Lumban Toruan; Ampala - Khoryanton
Jurnal Polimesin Vol 23, No 1 (2025): February
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/jpl.v23i1.5692

Abstract

Reinforcing materials such as fiber; are most widely used to give new properties to composites. This study investigates the effect of palm fiber (Arenga pinnata) volume fraction on the physical and mechanical properties of epoxy-based composites. Composite specimens with 0% and 2.5% fiber volume fractions were fabricated, maintaining a uniform thickness of 2 mm. The fabrication process involved fiber extraction, mixing with epoxy resin, and controlled curing. The physical properties assessed included density, porosity, and water absorption, while mechanical testing involved tensile and bending tests. The results demonstrated that the 2.5% fiber-reinforced composite exhibited improved properties compared to the 0% fiber composite. The density increased from 5.85 g/cm³ to 13.43 g/cm³, while porosity and water absorption rose slightly to 0.40% and 0.03%, respectively. In mechanical testing, the tensile strength increased from 2.64 MPa to 6.29 MPa, while strain improved from 1.06% to 4.59%. Young’s modulus, however, decreased from 2.49 MPa to 1.37 MPa, indicating enhanced flexibility. The bending stress increased from 6.35 MPa to 10.85 MPa, and deflection improved from 1.45 mm to 7.35 mm. These findings indicate that incorporating 2.5% palm fiber provides an optimal balance between strength and flexibility, making it a promising reinforcement for lightweight composite applications.
Synthesis and characterization of fly ash-derived silica for potential application in solid polymer electrolytes Abiyyu Sayyid Muwaffaq; Sulis Marsudi; Kartika Sari; Evi Yulianti; Sudaryanto Sudaryanto
Jurnal Polimesin Vol 24, No 4 (2026): August
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/jpl.v24i4.9239

Abstract

The development of sustainable materials for solid polymer electrolytes has encouraged the utilization of industrial waste as a source of functional materials. This study aims to synthesize and characterize silica derived from fly ash using the sol-gel method for potential application in solid polymer electrolyte materials. Silica extraction involved HCl acid treatment, NaOH alkaline dissolution, precipitation, filtration, and drying. Structural and electrochemical properties were characterized using Fourier transform infrared spectroscopy (FTIR) and electrochemical impedance spectroscopy (EIS). FTIR analysis confirmed the formation of amorphous silica through silanol (Si–OH) and siloxane (Si–O–Si) functional groups, with the strongest absorption peak at 1001.55 cm⁻¹ corresponding to Si–O–Si stretching and a broad band at 3374.41 cm⁻¹ associated with hydroxyl groups and adsorbed water. EIS analysis showed frequency-dependent impedance and dielectric behavior over 10¹–10⁶ Hz. The real and imaginary impedance decreased with increasing frequency, indicating reduced polarization and enhanced ion transport. The Nyquist plot exhibited a depressed semicircle and diffusion tail, indicating combined bulk conduction and ion-diffusion behavior. The ionic conductivity reached 1.30 × 10⁻⁶ S/cm. The dielectric constant was highest at low frequencies and decreased with increasing frequency, while dielectric loss approached zero at high frequencies. These results indicate that fly ash-derived silica has structural and electrochemical characteristics suitable for further investigation as a filler in solid polymer electrolyte materials.
Co-Authors Abiyyu Sayyid Muwaffaq Agung Bambang Setio Utomo Ampala - Khoryanton Evi Yulianti Parmin Lumbantoruan Sudaryanto Sudaryanto Sulis Marsudi Sunardi - Yazid Zainur Isnen