<p>This study explores the impact of using maleated PBAT (PBAT-g-MA) as a compatibilizer on the thermal and mechanical characteristics of composites made from polybutylene adipate-co-terephthalate (PBAT), Palm Fronds (PF) and Palm Stearin (PS). The issue arises from the use of single-use plastics which is non-biodegradable and raises concern for the environment. Additionally, the insufficient use of OPF PS, and PBAT-g-MA restricts the potential benefits they could offer. The research aims to improve the thermal and mechanical properties of PBAT/PF/PS blend by using PBAT-g-MA which includes enhancing the tensile strength, elongation, and thermal stability of the composite. In this research, a biodegradable composite blend was created by blending PBAT with PF and PS as a filler and subsequently incorporating PBAT-g-MA as a compatibilizer. The PBAT, PF, PS and PBAT-g-MA mixture was melted using an internal mixer. The result indicates that adding PBAT-g-MA significantly improved tensile strength and elongation at break, while reducing Young’s modulus. Thermal analysis showed a slight reduction in initial thermal stability with increasing PBAT-g-MA but demonstrated more uniform thermal degradation. Thus, these findings show that PBAT-g-MA can be an effective compatibilizer to enhance the mechanical and thermal properties of PBAT/PF/PS composites.</p>