Park, Hyeon-Woo Lee, Miyeon Kim, Seo Gyun Ku, Bon-Cheol Jang, Se Gyu Kim, Byoung-Suhk You, Nam-Ho 2025-06-18T03:00:20Z 2025-06-18T03:00:20Z 2025-06-13 2025-08 2642-4169 https://pubs.kist.re.kr/handle/201004/152627 In this work, polyimide (PI) with high thermal stability was utilized as a precursor to prepare graphite films with high thermal conductivity. Aromatic PIs containing acetylene units in their backbone were synthesized through the condensation polymerization of 4,4 '-(ethyne-1,2-diyl)diphthalic anhydride (EBPA), 4,4 '-biphthalic anhydride (BPDA), and 3,3 '-dihydroxybenzidine (DHB). Under a heat treatment, the acetylene units in the PI structure form crosslinked bonds within the polymer main chain via a cycloaddition reaction. This crosslinking enhances thermal stability and increases char yield. The grain size, crystallinity, and thermal conductivity of the resulting graphite films were analyzed. Notably, the graphite film derived from the PI precursor with the highest acetylene unit content demonstrated high density (2.221 g/cm3), a large grain size (130.14 nm), and excellent thermal conductivity (1334 W/mK). English WILEY Crosslinked Aromatic Polyimides for High-Performance Heat-Dissipation Materials Article 10.1002/pol.20250142 1 Journal of Polymer Science, v.63, no.15, pp.2997 - 3004 Journal of Polymer Science 63 15 2997 3004 N scie scopus 001499855400001 2-s2.0-105007229376 Polymer Science Polymer Science Article; Early Access ENHANCED THERMAL-CONDUCTIVITY STRUCTURAL EVOLUTION ACETYLENE GROUPS GRAPHITE FILMS GRAPHITIZATION CARBONIZATION NMR carbonization crosslinking graphitization polyimide thermal conductivity