Thermal and Dynamic Mechanical Analysis of Epoxy Polymer Bio‐Composites Reinforced with Sisal Fibers and Carbon Nanotubes
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The present study investigated the thermal and dynamic mechanical properties of epoxy polymer bio-composites reinforced with 15 wt.% sisal fiber and varying concentrations (0, 0.5, 1.0, 1.5, and 2.0 wt.%) of carbon nanotube (CNT) additives. Thermogravimetric Analysis (TGA) revealed that the composite with 1.0 wt.% CNT exhibited the highest thermal stability, with minimal weight loss across a temperature range of 30°C – 790°C. Differential Scanning Calorimetry (DSC) results indicated enhanced crystallinity and thermal resilience in the 1.0 wt.% CNT formulation. Dy-namic Mechanical Analysis (DMA) indicated that the proposed composite has the highest storage modulus of 3859.28 MPa, loss modulus of 539.44 MPa, and a glass tran-sition temperature of 89.26°C. It also has the lowest damping factor (tan δ = 0.25), de-noting superior stiffness and reduced energy dissipation. The reported results highlight the optimal reinforcement effect of 1.0 wt.% CNT, improving thermal stability, mechanical performance, and interfacial bonding in sisal fiber-reinforced epoxy composites for advanced industrial applications.