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UNDERSTANDING TEMPERATURE PROGRAMABLE BEHAVIOR OF SWCNT-EPOXY UNDERFILL FOR COMPONENT LEVEL REWORKABILITY
Keywords: underfill, reworkability, temperature controlled
We present a study of temperature controlled reworkability behavior of single wall carbon nanotubes (SWCNTs) based polymer epoxy. Thermal management of superconducting devices is critical along with the ability to reuse the superconducting ICs. SWCNTs based polymer epoxies demonstrate this unique combination of properties when applied as underfill. Polymer epoxies have been shown to be programmed with known SWCNTs loading, which allow reflow of previously attached SWCNTs-epoxy at a specific desired temperature. Thermoset polymer was loaded with a range of (0.1% - 1.0%) 99.99% purified single walled carbon nanotubes. Results show that 0.4%, 0.5%, and 0.7% loadings result in well controlled reflow temperature assisting detachment of ICs at 116 °C, 112 °C, and 71 °C, respectively. We also present rheological, microstructural, and related thermal and electrical characterization along with proposed mechanism.
Vishwas N. Bedekar, Research Associate Professor
University of Arkansas
Fayetteville, AR
USA


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