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All Journal Journal of Applied Agricultural Science and Technology
Ruri Wijayanti
Andalas University
Agriculture, Biological Sciences & Forestry

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Utilizationof Rice Husk-derived Microsilica as a Reinforcing Agent in MOCAF Starch-based Bioplastics: Enhancing Mechanical Strength, Barrier Properties and Thermal Stability Ruri Wijayanti; Emriadi Emriadi; Anwar Kasim; Nalwida Rozen
Journal of Applied Agricultural Science and Technology Vol. 10 No. 3 (2026): Journal of Applied Agricultural Science and Technology
Publisher : Green Engineering Society

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.55043/jaast.v10i3.581

Abstract

Starch-based bioplastics are increasingly recognized as eco-friendly substitutes for conventional synthetic plastics owing to their renewable origins and biodegradability. However, their poor mechanical properties and high affinity for water limit their practical applications. In this study, microsilica derived from rice husks was incorporated as a reinforcing agent to enhance the performance of bioplastics based on a modified cassava flour (MOCAF) starch matrix. This study aimed to determine the characteristics of bioplastics with a MOCAF starch matrix and microsilica added at various concentrations. Bioplastics were prepared with the solution casting method involving starch extraction, gelatinization, addition of microsilica at varying concentrations (0%, 1%, 2%, 3%, 4% and 5%), incorporation of a plasticizer (glycerol) and subsequent molding. The results demonstrated that microsilica addition significantly affected the physicochemical properties of the bioplastics. Tensile strength increased with microsilica content, reaching a maximum of 3.73 MPa at 5 wt%, followed by decreases at higher concentrations. Conversely, elongation at break decreased with increasing microsilica content, indicating reduced flexibility. Water absorption also decreased, indicating increased water resistance in the bioplastics. Fourier Transform Infrared (FTIR) analysis confirmed the interaction between microsilica and the starch matrix, while thermogravimetric analysis (TGA) revealed increased thermal stability after the addition of microsilica. Overall, the incorporation of microsilica effectively improved the mechanical, thermal and barrier properties of the MOCAF-based bioplastics, highlighting their potential for developing more durable and environmentally friendly materials.
Co-Authors Anwar Kasim Emriadi - Nalwida Rozen