Effect Of Type Of Substrates To Conductive Ink Under Thermal Performance

Azmi, Muhammad Zaim (2018) Effect Of Type Of Substrates To Conductive Ink Under Thermal Performance. Project Report. UTeM, Melaka, Malaysia. (Submitted)

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Abstract

This research project were done to investigate the effect of type of substrates to conductive ink under thermal performance. Two type of substrates were use which is Thermoplastic Polyurethanes (TPU) and Polyethylene Terephthalate (PET) were considered to be use in this research project. Carbon conductive ink from company Bare Conductive were used to be printed on the substrates using screen printing method. Instead of conventional method of screen printing method which use mesh as ink template, two tape were tape parallel to each other with the gap of 3 mm to create the ink template. The consistency of the ink printed where considered before continue with the resistivity test of the substrate. The conductive ink were printed for both TPU and PET substrates to be use for the resistivity test & surface roughness test. The electrical resistivity were tested using four-point probe from Jandel’s RM3000 test unit, with using ASTM F390-98 as guideline. In terms of the substrate’s resistivity, it can be conclude that the TPU resistivity is much lower than PET resistivity where TPU at room temperature have 149.2 Ω/sq while PET have 370.8 Ω/sq at room temperature which is twice the amount of TPU. For the resistance against temperature’s result, the resistivity of the conductive ink on both substrates will decrease as the temperature applied to the conductive ink increase where at 100°C, TPU resistivity drop till 52.8 Ω/sq while PET resistivity at 100°C is 102.3 Ω/sq. The surface roughness of both of the substrates and the conductive ink will also decrease when the temperature applied increase where for TPU the mean surface roughness are 2.958μm at room temperature and drop to 1.17μm at 100°C while PET’s mean surface roughness for room temperature are 1.921μm and drop to 1.332μm for 100°C. For the adhesion test, a new batch of TPU and PET samples were made to be conduct for this test. The test were conducted using ASTM D3359 as guideline. For the adhere test, the conductive ink appear to be easily detached from the TPU substrates compare to PET and the same results occurred as the temperature increase. However this result seems to be contradicted to the fact that higher surface roughness give better adhesion. Therefor, it can also be conclude that this conductive ink are not suitable as it is very easily detach from the substrates.

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