Effect Of Matrix Ductility On The Properties Of Pineapple Leaf Fibre Reinforced Poly Lactic Acid Composite

Salleh, Effi Nur Shazleen (2019) Effect Of Matrix Ductility On The Properties Of Pineapple Leaf Fibre Reinforced Poly Lactic Acid Composite. Project Report. Universiti Teknikal Malaysia Melaka, Melaka, Malaysia. (Submitted)

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Abstract

To-date, there is a large body of knowledge in the literature on the development of biocomposites. Nonetheless, some of the main limitation is the brittleness of the biocomposites when using PLA matrix which lead to relatively poor mechanical performance of the biocomposites. Thus, the main objectives of this research project are (i) improve the ductility of the PLA matrix by blending with PBS, (ii) correlate the morpological analysis with mechanical properties and (iii) to compare the effects of matrix ductility onto PALF based biocomposites. PBS content were kept at 5, 10,15 and 20% in PLA/PBS blending mixing by adapting solvent casting method. The thin film then were compressed moulded at 175°C. Following these, the biocomposites were characterized in terms of their tensile properties and surface fracture morphology. With addition of PBS contents, the ductility of the blend was improved from only 1.92% into more than 4%. At the same time, the tensile strength of the blends was decreasing as the PLA was reduced. Same goes to the modulus of elasticity in which the stiffness was lesser once the PBS contents was increased. However, the tensile and elongation at break properties were optimized at 80/20 blends, probably caused by the immiscibility of the blend. The optimum blends content, 80/20 were then utilized in 40 wt.% PALF reinforced PLA/PBS composite. The composite were prepared by combining the pre-preg technique and compression moulding. With addition of the PBS in the PLA matrix, the tensile strength were reduce from 122 MPa to 102 MPa. This is due to inferior tensile strength of the ductile PBS. However, the brittleness of the composite had improved with elongation at break increased from 6.64 to 7.23%.

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