Hygrothermal Aging Effect On Reliability Performance Of Electrically Conductive Adhesives (ECA)

Othman, Muhammad Amin (2018) Hygrothermal Aging Effect On Reliability Performance Of Electrically Conductive Adhesives (ECA). Project Report. UTeM, Melaka, Malaysia. (Submitted)

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Abstract

This research investigates the hygrothermal aging effect on performance reliability of electrically conductive adhesives made from solution mixing process using epoxy matrix and MWCNT with filler loading of 5 wt.%, 6 wt.% and 7 wt.%. The test specimens which are the electrically conductive adhesives (ECA) were prepared in accordance with ASTM F390-11 using a four point probe for electrical conductivity measurement while the lap shear test was conducted with reference to ASTM D1002-10 using a universal testing machine. For the hygrothermal aging study, the ECA samples were conditioned in a humidity chamber at setting conditions of 85C and 85 % of relative humidity (85 % RH) to assess the reliability performance of the ECA. The test specimens were subjected to 168 hours and 504 hours of hygrothermal aging and specified test specimens were characterized at normal condition as controlled specimens. Following hygrothermal aging period, the test specimens were characterized in terms of their electrical and mechanical performance. With presence of moisture attack, that is the water molecules, the electrical conductivity of the ECA increase with hygrothermal aging period. Meanwhile, lap shear results revealed contradicting trend. Regardless of the amount of MWCNT filler loading used (5-7 wt.%), due to moisture attack, voids are created in the epoxy matrix of the ECA, which results in a decrease in the shear strength of the ECA, when the samples were subjected to 168 hours and 504 hour of hygrothermal aging at 85°C and 85% RH. The trend changes at the ECA after being aged for 504 hours. The 6 wt. % and 7 wt. % of MWCNT filler loading shows an increase of shear strength while the 5 wt. % shows a decrease in shear strength. Nevertheless, all specimen shows the formation of voids in the epoxy matrix of the ECA, which contributes to the decrease in the shear strength of the ECA.

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