A Study On Electrical Properties Of Flexible Printed Electronic Circuit Subjected To Cyclic Bending Load

Norrizan, Muhammad Khaizuran (2018) A Study On Electrical Properties Of Flexible Printed Electronic Circuit Subjected To Cyclic Bending Load. Project Report. Universiti Teknikal Malaysia Melaka, Melaka, Malaysia. (Submitted)

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Abstract

This study investigates the reliability of printed conductive ink on flexible substrate under cyclic bending.The topic is focused on the resistance effect in conductive ink after being test with cyclic bending on different number of cycles.In this study,the test sample and specimens with various circuit width and thickness were printed on PET substrates.The test samples were printed using screen printing method.The conductive ink used was commercially obtained from Bare Conductive Ink. The ink was water and SWCNT based.The sample prepared were varied in term of circuit line width (1.0mm,1.5mm, 2.0mm,2.5mm and 3.0mm) and circuit line thickness(0.05mm, 0.10mm,0.15mm,0.20mm and 0.25mm).The readily sample was measured in term of its resistivity prior to bending tests.All of the sample prepared was later subjected to repeated bending cycles of 500,1000,1500,2000 and 2500 times at fixed bending speed of 0.6 second per cycle on 11 volts.The circuit resistance was taken after the bending test.Finally,all of the samples was analyzed by using image analyzer.Results comparison between initial resistance and final data was conducted.The initial resistance without undergo bending cycle shows that the increasing of circuit line width resulting on decreasing of resistivity,while for thickness sample shows the same result where increasing of circuit thickness,resistivity of the circuit decrease except 0.20mm of thickness samples.Additions of ink volume used,means more electron can pass on the circuit and resulting on better conductivity.Meanwhile,for the sample of complete bending cycles,the resistivity tends to decrease when number of cycles increase for the width and thickness samples except for 2.5mm of width and 0.25mm of thickness sample. Up to 2500 cycles,the circuit resistivity is less affected by cyclic bending load.

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