Investigation of mechanical behaviour on corn starch

Ahamad, Nur Asyrani (2022) Investigation of mechanical behaviour on corn starch. Project Report. Melaka, Malaysia, Universiti Teknikal Malaysia Melaka. (Submitted)

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Abstract

Renewable resources are typically plant-based resources such as starch, agar, and cellulose. Starch, which is produced as an energy store by many green plants, has been considered an appealing and ideal candidate to replace petroleum-based materials. The main aim of this research is to investigate the mechanical behaviour of biodegradable matrix derived from corn starch. The objectives of this research is to fabricate the composite matrix using biodegradable derived from corn starch and to understand the fundementals mechanical behaviour and morphological of thermoplastic corn starch. During material preparation, both thermoplastic starch and glycerol must be weight using different type of ratio before mixing it all together. Then, the mixture of thermoplastic cornstarch and glycerol were mix together using either hand or high speed blender for about 2 to 3 minutes. The mixture then put into the mould with the dimension of 140 x 60 mm. After prepping the mixture inside the mould, the mould will be put into the hot press machine for pre – heating process for about 15 minutes then hot press at pressure of 25 kg/cm2 with 165ºC of temperature for 15 minutes followed by cooling process for another 15 minutes. The material testing involved in this research is tensile test following the ASTM D-638 and flexural test by following the ASTM D790. As for morphological characteristics, scanning electron microscope (SEM) will be involved. The highest tensile strength for tensile testing is concertration of 70 wt.% thermoplastic corn starch while whereas the highest flexural strength is achieved at concertration of 70 wt.% thermoplastic corn starch. In conclusion, the addition of glycerol substantially increased the tensile strenght and flexural strenght of the composites matrix.

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