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Copper-Filled Electrically Conductive Adhesives with Enhanced Shear Strength

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Abstract

In this study, the effects of diethyl carbitol (diluent) and tertiary amines on the electrical, mechanical, and rheological properties of the Cu-filled polyurethane-based electrically conductive adhesives (ECAs) were investigated. Significant difference could be observed in the electrical resistivity and shear strength of ECA prepared with different amount of diethyl carbitol. Reduced electrical resistivity was found in ECAs prepared with addition of tertiary amines, but no obvious change was observed in the shear strength of the ECA joint. Rheological property of the ECA paste was investigated in order to understand the correlation of the viscosity of ECA paste and electrical resistivity and shear strength of ECA joint. Results revealed that decrease in viscosity of the ECA paste reduced electrical resistivity and enhanced shear strength of ECA joint. A Cu-filled polyurethane-based ECA with considerably low electrical resistivity at the magnitude order range of 10−3 Ω cm, and significantly high shear strength (above 17 MPa) could be achieved.

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Acknowledgments

This work was supported by Grant-in-Aid for JSPS fellows (23-01376). We would like to thank K. Matsubara from Sumika Bayer Urethane Co. Ltd. for kindly providing us the resin in this study. Besides, we would like to express our gratitude to Assoc. Prof. Dr. H. Abe for the use of rheology instrument.

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Authors and Affiliations

  1. Joining and Welding Research Institute, Osaka University, 11-1 Mihogaoka, Ibaraki, Osaka, 567-0047, Japan

    Li-Ngee Ho & Hiroshi Nishikawa

  2. School of Materials Engineering, University Malaysia Perlis, 02600, Arau, Perlis, Malaysia

    Li-Ngee Ho

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  1. Li-Ngee Ho
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Correspondence to Li-Ngee Ho.

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Ho, LN., Nishikawa, H. Copper-Filled Electrically Conductive Adhesives with Enhanced Shear Strength. J. of Materi Eng and Perform 23, 3371–3378 (2014). https://doi.org/10.1007/s11665-014-1115-4

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  • DOI: https://doi.org/10.1007/s11665-014-1115-4

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