The effect of fibre and nano materials on mechanical strength of polylactic blend

Kamaruddin, Hazwan Fikri (2021) The effect of fibre and nano materials on mechanical strength of polylactic blend. Project Report. Universiti Teknikal Malaysia Melaka, Melaka, Malaysia. (Submitted)

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Abstract

A few research had been reported that PLA is eco-friendly, biocompatible, good thermal processibility and low cost. However, PLA has brittle behaviour and degrade over a period of time. This project focus on tensile strength tests of PLA blends with natural fibre and graphene nanomaterials at specified amount, follow with Scanning Electron Microscope (SEM) analysis. SEM morphology study is to elaborate and relate the effect of reinforce materials on mechanical strength of PLA blend. The research activities have achieved objective in development of PLA/fibre and PLA/graphene materials in term of mechanical strength and morphology study was conducted aspect the potential of PLA materials. For the third objective, the PLA/fibre blend and pure PLA characteristics were compared using tensile and scanning electron microscopy Compared with pure PLA filaments, composite filaments revealed an almost 25.37% reduction in tensile strength due to interfacial defects (poor bonding between PLA/fibre). Furthermore, PLA/graphene blend samples were also compared with pure PLA samples which also showed less mechanical strength up to 36.98% compared with pure PLA 3D samples due to the presence of micro voids. From the tensile graph shows that there was a change in properties of PLA in the PLA/graphene blend from brittle to elasticity where the graph shows elongation for 0.5% and 0.75% graphene content These voids also caused reduction in tensile strength of the blends. The effects occurred in the blends was caused by the size of materials and process parameters during the blending process. It is observed from the SEM analysis where the presence of the compatibilizer agent was insufficient in the PLA/graphene blend which contribute to the lack of bonding between PLA and graphene and resulted in the to a decrease in tensile strength

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