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Mechanical Properties, Stretching Durability, and Creep Behavior of Stretchable Thermally Conductive Films with Embedded-Graphite-Composite Patterns
Abstract
Because thermal interface materials are composites with high-fi ller-loading, they are rigid, while also having large thermal
conductivity. Their use has consequently been limited to fabricating rigid electronics. To address this shortcoming, stretchable
thermally conductive fi lms in which graphite composite patterns are embedded in a highly stretchable polymer matrix
were fabricated in this study. Because the modulus of the graphite composite was 200-fold greater than that of the polymer
matrix, the fabricated fi lms consisted of the alternating rigid segments and soft segments. Accordingly, they stretched via
elongation of soft segments with the rigid segments undergoing little change. The rigid-segment-to-soft-segment ratio of
the fi lms was adjusted by varying either the size of the graphite composite patterns or the gap between the patterns, and the
eff ect of this ratio on the stretchability and creep resistance was investigated. Based on the results, g-hs-PUA (55/1.0), in
which 5 mm × 5 mm graphite composite patterns with the gap of 1.0 mm were embedded in highly stretchable polyurethane
acrylate (hs-PUA), featured the highest creep resistance and its in-plane thermal conductivity was 1.03 (± 0.10) W m −1 K −1 .
The thermal conductivity was decreased by 12% after 1000 stretching cycles at 50% strain.
