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콜타르피치 기반 활성탄소섬유의 제조 및 특성에 관한 연구. II. 물리적 활성화법에 의한 활성탄소섬유의 구리(II), 니켈(II) 흡착 특성
최보경,윤광의,서민강,박수진,Choi, Bo-Kyung,Yoon, Kwang-Eui,Seo, Min-Kang,Park, Soo-Jin 한국섬유공학회 2015 한국섬유공학회지 Vol.52 No.2
In this paper, the heavy metal ion adsorption behavior in coal tar pitch-based activated carbon fibers (ACFs) during physical activation is presented. $N_2$ adsorption isotherms at 77 K were examined using Brunauer-Emmett-Teller (BET), Horvath-Kawazoe (H-K), and Barret-Joyner-Halenda (BJH) methods to characterize specific surface area, pore volume, and pore size distribution. The removal of heavy metal ions from ACFs was confirmed by atomic absorption spectroscopy (AAS). Experimental results for the ACFs showed a type I isothermal adsorption curve, which confirmed that the created pores were mostly microporous. After a 40-min steam activation, the fibers showed a high specific surface area of $1,693m^2/g$. In addition, all heavy metal ions in the ACFs were adsorbed after about 20 min, and the adsorption reached equilibrium within 1 h. It was found that the adsorption capacity of the ACFs was improved by the presence of micropores but was also dependent on the specific surface area of the ACF.
미분쇄 탄소섬유와 카본블랙으로 강화된 천연고무 컴파운드의 기계적 특성
함은광,최경은,서민강,Ham, Eun-Kwang,Choi, Kyeong-Eun,Seo, Min-Kang 한국섬유공학회 2016 한국섬유공학회지 Vol.53 No.2
This study investigated the mechanical properties of natural rubber (NR) compounds reinforced with carbon black (CB) and milled carbon fiber (MCF). An internal mixer and a two-roll-mill were used to prepare natural rubber compounds using various MCF concentrations (0, 2, 6, 12, 17 phr), and to align the MCF in the compounds. The tensile properties, tearing strength, and hardness of the compounds were measured. The study found that compounds with 40 phr CB and 2 phr MCF had the highest tensile strength. Compounds with higher MCF concentrations had greater hardness and tensile stress (100% modulus~300% modulus). Compounds with 40 phr CB and 6 phr MCF were found to have greater tearing strength. These results were probably due to the fact that high elasticity MCF was used, resulting in improved cohesion in the compounds.
산소-불소 처리된 탄소섬유가 에폭시 매트릭스 복합재료의 기계적 계면특성과 크랙저항 특성에 미치는 영향
박수진,오진석,서민강,한미정,김학용,Park Soo-Jin,Oh Jin-Seok,Seo Min-Kang,Han Mijeong,Kim Hak-Yong 한국섬유공학회 2005 한국섬유공학회지 Vol.42 No.3
In this work, the effect of oxy-fluorination on surface characteristics of carbon fibers was investigated in terms of fracture toughness and crack resistance properties of the epoxy matrix composites. The surface properties of the carbon fibers were determined by acid-base values, X-ray photoelectron spectroscopy (XPS), and FT-IR measurements. And their fracture toughness of the composites were evaluated by the interlaminar shear strength (ILSS) and critical stress intensity factor $(K_{lc})$. Crack resistance of the composites was investigated using two types of testing methods, namely critical energy release rate mode I $(G_{lc})$ and mode II $(G_{llc}).\;O_{ls}/C_{ls}\;and\;(O_{ls}+F_{ls})/C_{ls}$ ratio from XPS were increased by oxy-fluorination, due to the oxygen containing functional groups and the formation of $C-F_{x}$ bonds on the carbon fiber surface. It was found that the fracture toughness and crack resistance of the composites had been improved by the oxy-fluorination, which could probably be attributed to the increase in the degree of adhesion at interfaces between the carbon fibers and epoxy resin matrix in the present composite system.
불소처리된 카본블랙을 충전한 HDPE 기지 컴파운드의 PTC/NTC 특성에 관한 연구
박수진,송수완,서민강,신재섭,김규철,Soo-Jin Park,Su-Wan Song,Min-Kang Seo,Jae-Sup Shin,Kyuchul Kim 대한화학회 2003 대한화학회지 Vol.47 No.2
In this study, the fluorinated carbon blacks(CB) were used to reduce the negative temperature coefficient (NTC) phenomenon of the CB-filled high density polyethylene(HDPE) compounds in the fluorination pressure of 0.1-0.4 MPa. The changes in surface properties of the CB were investigated by using FT-IR, XPS and contact angle measurements. From the FT-IR results, the fluorinated CB showed the C-F absorption peak at 1400-1000 cm$^{-1}$ and the peak intensity was increased with increasing the fluorination pressure. Also, the analysis of XPS spectra of the fluorinated CB indicated that fluorine content was increased with increasing the fluorination pressure. Meanwhile, the surface free energy of the fluorinated CB was decreased with increasing the fluorination pressure. Consequently, the increase of fluorine contents on CB made a disappearance of NTC behaviors of CB/HDPE compounds, which was probably due to the reduction of CB reaggregation after melting point of the HDPE, resulting from decreasing the surface free energy of CB particles. 본 연구에서는 PTC 소자의 NTC 현상을 제거하기 위하여 카본블랙을 0.1-0.4 MPa의 압력으로 불소처리 한 후 이를 이용하여 카본블랙/HDPE 전도성 컴파운드를 제조하였다. 불소처리한 카본블랙의 표면특성 변화는 FT-IR, XPS 그리고 접촉각 측정을 통하여 확인하였다. FT-IR실험 결과, 불소처리된 카본블랙은 1400-1000 cm$^{-1}$ 영역에서 C-F 피크를 나타내며 처리압력이 증가할수록 C-F 피크의 세기가 증가함을 확인할 수 있었다. 또한, XPS 분석을 통해 불소처리 압력이 증가할수록 카본블랙 내의 불소의 함량이 증가함을 확인하였다. 그러나, 불소처리된 카본블랙의 표면자유에너지는 처리압력이 증가할수록 감소하였다. 결과로서, 카본블랙의 불소 처리를 통해 카본블랙/HDPE 컴파운드의 NTC 현상이 사라졌는데, 이는 카본블랙의 표면자유에너지 감소가 수지의 융점 이후 일어나는 카본블랙 입자간의 재결합을 방해하기 때문이라 사료된다.
다중벽 탄소나노튜브강화 폴리프로필렌 나노복합재료의 전자파 차폐효과 및 기계적 특성
임윤지(Yoon Ji Yim),서민강(Min Kang Seo),김학용(Hak Yong Kim),박수진(Soo Jin Park) 한국고분자학회 2012 폴리머 Vol.36 No.4
본 연구에서는 다중벽 탄소나노튜브(MWCNT)의 함량을 1에서 10 wt%까지 달리하여 MWCNT 강화 폴리프로필렌(PP) 나노복합재료의 전자파 차폐효과 및 기계적 특성에 미치는 영향에 대해서 살펴보았다. 전기전도도는 4 단자법으로 측정하였고, 전자파 차폐효과는 흡수와 반사방법으로 분석하였다. 기계적 특성은 임계응력세기인자(KIC) 측정을 통하여 고찰하였으며, 모폴로지는 주사전자현미경(SEM)으로 관찰하였다. 실험결과, MWCNT의 함량이 증가 함에 따라 차폐효과가 향상됨을 확인할 수 있었으며, MWCNT의 함량이 전자파 차폐효과를 결정하는 중요한 요소 임을 알 수 있었다. KIC값도 MWCNT의 함량이 증가할수록 큰 값을 가지는 것을 확인할 수 있었으나 5 wt% 이상에 서는 오히려 감소하였다. 이는 과량의 MWCNT가 PP 내에서 서로 뭉침으로 인하여 KIC값을 감소시킨 것으로 판단 된다. In this work, the effect of multi-walled carbon nanotube (MWCNT) on electromagnetic interference shielding effectiveness (EMI SE) and mechanical properties of MWCNT-reinforced polypropylene (PP) nanocomposites were investigated with varying MWCNT content from 1 to 10 wt%. Electric resistance was tested using a 4-point-probe electric resistivity tester. The EMI SE of the nanocomposites was evaluated by means of the reflection and adsorption methods. The mechanical properties of the nanocomposites were studied through the critical stress intensity factor (KIC) measurement. The morphologies were observed by scanning electron microscopy (SEM). From the results, it was found that the EMI SE was enhanced with increasing MWCNT content, which played a key factor to determine the EMI SE. The KIC value was increased with increasing MWCNT content, whereas the value decreased above 5 wt% MWCNT content. This was probably considered that the MWCNT entangled with each other in PP due to an excess of MWCNT.