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Oh Sang-Ah,Yun Hyesun,Park KeumHwan,Kim Youngmin 한국화학공학회 2024 Korean Journal of Chemical Engineering Vol.41 No.1
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.