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The Dependence on Thermal History of the Electrical Properties of an Epoxy-Based Isotropic Conductive Adhesive

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Abstract

The effect of thermal history on the electrical resistivity of a typical isotropic conductive adhesive (ICA) composed of an epoxy-based binder has been investigated in the present work. The electrical resistivities of test specimens were found to be different depending on the curing temperature, even if they exhibited similar degrees of conversion, although the values of T g for the ICA specimens were determined by their degree of conversion, regardless of the curing temperature. Postannealing effects in terms of decreased electrical resistivity could be induced at a temperature in the vicinity of the glass transition temperature (T g ), even if the specimens already achieved full conversion during the preliminary curing process. The magnitude of the annealing effect was found to depend on the preliminary curing and postannealing temperatures. When the specimens exhibit conversions of greater than 25% prior to the postannealing process, the preliminary curing state of the binder can influence the electrical resistivity of the ICA that is obtained after annealing.

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ACKNOWLEDGEMENTS

Special thanks are given to NAMICS Co. Ltd., for their cooperation in providing the ICA employed in the present work. This work is partly supported by grants from the New Energy and Industrial Technology Development Organization (NEDO) and from the COE 21 program, “Towards Creating New Industries Based on Inter-Nanoscience.”

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  1. The Institute of Scientific and Industrial Research, Osaka University, Ibaraki, Osaka, 567-0047, Japan

    Masahiro Inoue & Katsuaki Suganuma

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  1. Masahiro Inoue
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  2. Katsuaki Suganuma
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Correspondence to Masahiro Inoue.

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Inoue, M., Suganuma, K. The Dependence on Thermal History of the Electrical Properties of an Epoxy-Based Isotropic Conductive Adhesive. J. Electron. Mater. 36, 669–675 (2007). https://doi.org/10.1007/s11664-007-0125-5

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  • DOI: https://doi.org/10.1007/s11664-007-0125-5

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