김중환 김성용 허소정 김서균 유남호 채한기 김환철 구본철 2024-01-12T02:37:02Z 2024-01-12T02:37:02Z 2022-07-26 2022-10 0008-6223 https://pubs.kist.re.kr/handle/201004/76008 https://www.sciencedirect.com/science/article/pii/S0008622322005450 Polyimide/graphene oxide nanoribbon (PI/GONR) composite fibers were prepared by wet spinning. The unfolded GONRs by the intense drawing of fibers maximized their contribution to enhance mechanical and conductivity properties. The composite fibers were spun with an optimal drawing ratio of 18, followed by carbonization at 1200 and 1400 °C, respectively. The PI/GONR (0.1 wt%) composite fibers carbonized at 1400 °C have the highest tensile strength (2.12 ± 0.45 GPa), which was 35% increase compared to PI-based carbon fibers that are carbonized at 1400 °C. In addition, electrical (604 ± 33 S/cm) and thermal conductivity (12 ± 0.56 W/m·K) improved by 58% and 32%, compared to PI-based carbon fibers carbonized at 1400 °C. These values are comparable with 625 S/cm of electrical conductivity and 9.4 W/m·K of thermal conductivities of Toray carbon fiber (T700). Optimal drawing conditions can maximize orientation and packing density, resulting in maximum performance with a small amount of GONR (0.1 wt%). This significant improvement in macroscopic properties confirms wide possibilities for the manufacture of GONR composite fibers to acquire carbon fibers with excellent physical properties produced through the addition of GONR. English Pergamon Press Ltd. Longitudinal alignment effect of graphene oxide nanoribbon on properties of polyimide-based carbon fibers Article 10.1016/j.carbon.2022.07.020 1 Carbon, v.198, pp.219 - 229 Carbon 198 219 229 Y scie scopus 000884288500004 Chemistry, Physical Materials Science, Multidisciplinary Chemistry Materials Science Article MECHANICAL-PROPERTIES COMPOSITE FIBERS HIGH-STRENGTH FABRICATION NANOCOMPOSITES CARBONIZATION NANOTUBES NITROGEN DAMAGE VOIDS Polyimide nanocomposites Graphene oxide nanoribbon Carbon fiber Mechanical properties Conductivity