Preparation and Characteristics of Polyimide Based Activated Carbon Fibers 


Vol. 61,  No. 1, pp. 33-40, Feb.  2024
10.12772/TSE.2023.61.033


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  Abstract

The correlation between the imidization degree of polyimide fibers and characteristics of activated carbon fibers was studied. Poly(amic acid) solution was spun by dry-jet wet spinning method and poly(amic acid) fibers were transferred into polyimide fibers by heat treatment of IR heater at 300 oC, 400 oC, 500 oC, 600 oC. Polyimide fibers were carbonized and activated at 900 oC. The imidization degree was investigated using FT-IR. The chemical structure was traced by FT-IR, elemental analyzer(EA) and x-ray diffraction(XRD). Thermal properties were analyzed with DSC and TGA. Mechanical properties were measured with single fiber tester(favimat). Specific surface area and pore characteristics were analyzed by BET method. The surface morphologies were observed by FE-SEM. The imidization degree of polyimide fibers increased up to 500 oC but decreased at 600 oC. The thermal and mechanical properties of polyimide fiber exhibited a dependency on the imidization degree. The mechanical properties and compact morphologies of activated carbon fiber strongly depended on the imidization degree of polyimide fiber. Activated carbon fiber was showed the maximum tensile strength value of 898 MPa and specific surface area composed of micropores value of 920 oC/g at IR heater temperature of 500 oC and the imidization degree of 96%.

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pISSN : 1225 - 1089
eISSN : 2288 - 6419

한국연구재단 우수등재학술지 유지 (2022년)