Abstract
This study focused on improving the material properties of thermoplastic pea starch (TPS) with the incorporation of polycaprolactone (PCL) and flax fiber. Accordingly, composites of glycerol-plasticized pea starch, polycaprolactone, and flax fiber were prepared through solid-phase compounding and compression-molding. The specimens were characterized through scanning electron microscopy, tensile test, moisture absorption test, and differential scanning calorimetry. Morphological studies of the tensile fracture surfaces revealed poor TPS-PCL interfacial interaction and limited TPS-flax fiber interfacial bonding. The composites showed significant improvements in tensile strength with reduced moisture absorption capability essentially due to the hydrophobicity of PCL. Individual components of the composites retained their respective thermal properties, an indication of thermodynamic immiscibility.
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