The performance of stretchable conductive ink (SCI) under mechanical factor

Abdul Rahim, Muhammad Izwan (2022) The performance of stretchable conductive ink (SCI) under mechanical factor. Project Report. Universiti Teknikal Malaysia Melaka, Melaka, Malaysia. (Submitted)

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Abstract

Graphene Nanoplatelets (GNPs) are excellent electrical and mechanical fillers for conductive polymers. However, the GNP size might affect the conductive polymer's conductivity and reliability, especially when it is subjected to various types of loading. This study shows the effect of GNP particle size on conductivity and reliability of conductive polymer composites when subjected to mechanical fatigue stress through the stretch test. In this work, two types of GNP filler sizes are considered which is the 5µm and 15µm with a mixed of surfactant. Following the manual cyclic stretch test, the results show that the resistivity increases as the number of cycles increases due to cracks' formation. The zero reading of bulk resistivity of 5um and 15um particles size was obtained when the stretch reached approximately 13 cm to 14 cm in length, which is 225% to 250% of the strain percentage. The applicable elongation of both particle sizes to withstand longer with better bulk resistivity is 125% with an elongation of 0.5 cm from the initial length of 4.0 cm. 15µm. Other than that, it was found that the peel strength of 15µm GNP which is 0.00419 N/mm is better compared to 5µm GNP which is 0.00328 N/mm. The surface morphology of each particle was described as a result of its bulk resistivity after being stretched through the cycles.

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