Effect of Heat-Treatment on Carbonization Behavior of Hetero-cyclic Aromatic Polymers for Carbon Material Precursors 


Vol. 57,  No. 3, pp. 133-142, Jun.  2020
10.12772/TSE.2020.57.133


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  Abstract

In this study, carbonized polyhydroxyamide (C-PHA) and polybenzoxazole (CPBO) precursors were prepared from PHA and PBO polymers, respectively, through heattreatment of 600−1200 °C for 1 h under nitrogen atmosphere. Fourier-transform infrared spectroscopy (FT-IR), elemental analysis (EA), X-ray photoelectron spectroscopy (XPS), thermographic and mass spectrometry, wide-angle X-ray diffraction, Raman spectroscopy, transmission electron microscopy, and electrical conductivity test were performed to monitor the changes in the chemical structures of the two precursors. From FT-IR, EA, and XPS results, PHA and PBO polymers were directly converted to C-PHA and C-PBO precursors, respectively, above 800 °C without undergoing the oxidative stabilization process. The maximum carbonization yield of the carbonized precursors was 1.36 times (68.3%) higher than that of the commercialized PAN-based carbon fiber (50%). High-resolution transmission electron microscopy images revealed a small amount (~30%) of turbostratic graphite structure around an external area in the C-PBO precursor at 1000 °C.

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pISSN : 1225 - 1089
eISSN : 2288 - 6419

한국연구재단 우수등재학술지 유지 (2022년)