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Graphitization of PAN-based carbon fibers by CO₂ laser irradiation
Liangbo Yao, Weimin Yang, Sanyang Li, Yang Sha, Jing Tan, Ying An, Haoyi Li 한국탄소학회 Carbon Letters 6 Pages
한국탄소학회 Carbon Letters 2017, Vol.24 13 97-102 (6 pages)
a laser. The X-ray diffraction data revealed that the growth of crystallite was parallel to the fiber axis, and the interlayer spacing d002 decreased from 0.353 to 0.345 nm. The results of scanning electron microscopy revealed that the surface of irradiated CFs was rougher than that of the unirradiated ones and there were scale-like small fragments that had peeled off from the fibers. The tensile modulus increased by 17.51% and the Weibull average tensile strength decreased by 30.53% after being... -
Morphologies and surface properties of cellulose-based activated carbon nanoplates
Seulbee Lee, Min Eui Lee, Min Yeong Song, Se Youn Cho, Young Soo Yun, Hyoung-Joon Jin 한국탄소학회 Carbon Letters 7 Pages
한국탄소학회 Carbon Letters 2016, Vol.20 5 32-38 (7 pages)
In this study, cellulose nanoplates (CNPs) were fabricated using cellulose nanocrystals obtained from commercial microcrystalline cellulose (MCC). Their pyrolysis behavior and the characteristics of the product carbonaceous materials were investigated. CNPs showed a relatively high char yield when compared with MCC due to sulfate functional groups introduced during the manufacturing process. In addition, pyrolyzed CNPs (CCNPs) showed more effective chemical activation behavior compared with... -
Influence of oxidative atmosphere of the electron beam irradiation on cyclization of PAN-based fibers
Hye Kyoung Shin, Mira Park, Hak-Yong Kim, Soo-Jin Park 한국탄소학회 Carbon Letters 3 Pages
한국탄소학회 Carbon Letters 2015, Vol.16 No.3 10 219-221 (3 pages)
In the Fourier-transform infrared spectroscopy analysis, the PAN fibers stabilized by EBI under an oxygen atmosphere exhibited a greater decrease in the peak intensity at 2244 cm-1 (C≡N vibration) and a greater increase in the peak intensity at 1628 cm-1 (C=N absorption) than the corresponding PAN fibers stabilized under an air atmosphere. From the X-ray diffraction analysis it was found that oxygen uptake in PAN fibers leads to an increase in the amorphous region, produced by cyclization. -
Effects of cross-linking methods for polyethylene-based carbon fibers: review
Kwan-Woo Kim, Hye-Min Lee, Jeong-Hun An, Byoung-Suhk Kim, Byung-Gak Min, Shin-Jae Kang, Kay-Hyeok An, Byung-Joo Kim 한국탄소학회 Carbon Letters 24 Pages
한국탄소학회 Carbon Letters 2015, Vol.16 No.3 2 147-170 (24 pages)
In recent decades, there has been an increasing interest in the use of carbon fiber reinforced plastic (CFRP) in aerospace, renewable energy and other industries, due to its low weight and relatively good mechanical properties compared with traditional metals. However, due to the high cost of petroleum-based precursors and their associated processing costs, CF remains a specialty product and as such has been limited to use in high-end aerospace, sporting goods, automotive, and specialist... -
Preparation and characterization of carbon fiber-reinforced thermosetting composites: a review
Fan-Long Jin, Soo-Jin Park 한국탄소학회 Carbon Letters 11 Pages
한국탄소학회 Carbon Letters 2015, Vol.16 No.2 1 67-77 (11 pages)
Carbon fibers (CFs) have a unique combination of properties which allow them to be widely used as reinforcing materials in advanced polymer composites. The mechanical properties of CF-reinforced polymer composites are governed mainly by the quality of interfacial adhesion between the CFs and the polymer matrix. Surface treatments of CFs are generally carried out to introduce chemical functional groups on the fiber surfaces, which provide the ability to control the surface characteristics of CFs.... -
글라이딩 아크 플라즈마를 이용한 PFCs 분해
이종문, 손홍선, 최경수, 박동화 한국열환경공학회 열환경공학 8 Pages
한국열환경공학회 열환경공학 2011, 제 8권 1호 3 18-25 (8 pages)
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An overview of new oxidation methods for polyacrylonitrile?based carbon fibers
Hye Kyoung Shin, Mira Park, Hak-Yong Kim and Soo-Jin Park 한국탄소학회 Carbon Letters 8 Pages
한국탄소학회 Carbon Letters 2015, Vol.16 No.1 2 11-18 (8 pages)
The process of oxidizing polyacrylonitrile (PAN)-based carbon fibers converts them into an infusible and non-flammable state prior to carbonization. This represents one of the most important stages in determining the mechanical properties of the final carbon fibers, but the most commonly used methods, such as thermal treatment (200°C to 300°C), tend to waste a great deal of process time, money, and energy. There is therefore a need to develop more advanced oxidation methods for PAN precursor... -
파주 혜음원지 출토 목기 부착 직물에 관한 연구
채정민, 유효선 한국대학박물관협회 고문화 21 Pages
한국대학박물관협회 고문화 2013, 제82집 5 113-133 (21 pages)
본 연구는 파주 혜음원지에서 출토된 목기에 사용된 직물에 대한 감별과 섬유의 퇴화 현상에 대한 섬유 특성을 조사한 것이다. 연구 결과 네 가지 목기에 사용된 직물은 모두 평직물로 sample 1, sample 2, sample 4는 면섬유로 조사되었으며 sample 3에서는 면섬유와 마섬유가 모두 관찰되었다. 시료는 섬유 고유의 성질을 대부분 잃어버렸으며 섬유의 측면과 단면에서 심각한 손상 모습이 관찰되었고 섬유의 결정화도가 매우 낮은 것으로 조사되었다. 이 결과는 다른 자연 퇴화된 섬유 유물에 대한 결과와 비교함으로써 고섬유의 퇴화... -
The Effect of Pressure on the properties of Carbon/Carbon Composites during the Carbonization Process
Hyeok-Jong Joo, In-Hwan Oh 한국탄소학회 Carbon Letters 8 Pages
한국탄소학회 Carbon Letters 2002, Vol.3 No.2 3 85-92 (8 pages)
탄소/탄소 복합재의 기지를 형성시키는 방법은 화학증착법이나 액상유기물질에 함침하여 열처리하는 방법이 있다. 이중에서 용융피치를 사용할 경우, 기지의 흑연화가 가능하고 고밀도 탄소/탄소 복합재 생산이 가능한 잇점이 있다. 상압에서는 핏치의 구성성분 중 비점이 낮은 저분자량 성분이 쉽게 휘발되면서 반응계로부터 제거되지만, 가압함침은 핏치의 구성성분의 비점이 상승하며 반응계 외로 방출되지 않고, 반응계에서 다방향족 성분으로 중축합을 일으켜서 고분자화되면, 결과적으로 탄화수율의 상승과 함게 함침효율을...
