Abstract
Thermally conductive films play a crucial role in expanding the lifetime of electronics by dissipating concentrated heat to heatsinks. In this work, a thermally conductive film (g-TC film) was manufactured using a perforated graphite sheet (p-GS) and a UV-curable pressure-sensitive adhesive (PSA) by lamination. A novel UV-curable PSA was prepared by incorporating a UV-curable abietic acid ester into a PSA composition. The UV-curable PSA became a tack-free film upon UV irradiation; thus, a flexible g-TC film with a 52-μm thickness was obtained. The defects in the g-TC film caused by air bubbles were removed by treating the p-GS with oxygen plasma. As the UV-cured PSA made a joint through the holes in the p-GS, cleavage of the graphite was not observed after 10,000 U-folding test cycles with a folding radius of 1 mm. The calculated in-plane thermal conductivity of the fabricated g-TC film was 179 W∙m−1K−1, which was stable after the U-folding tests.
Highlights
Kim, Y.-S.; Kwak, M.-G.; Kim, Y.The accumulation of heat generated at heat sources causes malfunctions of electronics, which are severe for portable devices with small and densely packed chips [1]
We developed a method to fabricate a flexible thermally conductive (TC) film using a UV-curable pressure-sensitive adhesive (PSA) by lamination
PSAwets wetsaasubstrate substrateintimately intimatelyduring duringbonding bondand is deformed during detachment, which leads to high peel adhesion
Summary
The accumulation of heat generated at heat sources causes malfunctions of electronics, which are severe for portable devices with small and densely packed chips [1] To address this problem, materials with high thermal conductivity have been employed for thermal management. The thermal conductivity of the composite was increased by two orders of magnitude compared to that of polymer because the 2D structure of graphene connected by sp hybridized carbon is advantageous for phonon transfer. Despite this advantage, the use of graphene film is limited because of the troublesome process of exfoliation of graphite into graphene [5]. Because lamination does not require any external energy, it is widely applied for producing tapes in Thermally Conductive Film Fabricated
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
