http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
대기압 화염 플라즈마 처리한 다중벽 탄소나노튜브 및 카본블랙 강화 고무복합재료의 기계적 특성 연구
성종환(Jong Hwan Sung),이동주(Dong Joo Lee),류상렬(Sang Ryeoul Ryu),조이석(Yi Seok Cho) 대한기계학회 2010 대한기계학회 춘추학술대회 Vol.2010 No.4
다중벽 탄소나노튜브(MWCNT) 및 카본블랙(CS) 함유량, 대기압 화염 플라즈마(APFP) 처리 그리고 산처리를 함수로 한 고무복합재료의 기계적 특성에 대해 연구하였다. 고무복합재료의 인장강도 및 탄성율은 MWCNT의 함유량 증가에 따라 순수상태 그리고 동일량의 CS가 보강된 상태에 비해 증가하였다. APFP 처리한 MWCNT를 보강한 복합재료는 처리하지 않은 경우에 비해 강화효과(높은 강도, 높은 탄성율 그리고 높은 연성)를 보였다. 반면에 APFP 처리한 CS를 함유한 복합재료는 처리하지 않은 경우에 비해 연화효과(높은 강도, 낮은 탄성율 그리고 높은 연성)를 보였다. 산처리 시간이 1시간에서 2시간으로 증가할수록, 그리고 황산의 농도가 60%에서 90%로 증가할수록 복합재료의 인장강도와 탄성율은 감소하였다. 전체적으로 MWCNT 함유량, CS 함유량, 대기압 화염 플라즈마 처리, 황산 농도 그리고 산처리 시간 등이 고무복합재료의 기계적 특성에 영향을 미치는 중요한 변수임을 확인하였다. The mechanical properties of elastomeric composites were investigated as functions of carbon nano tube(MWCNT) content, carbon black(CB) content, atmospheric pressure name plasma(APFP) treatment and acid treatment. The tensile strength and modulus increase with increasing MWCNT content when compared to the pure rubber and the filled rubbers with same amount of CB. The composite with APFP treated MWCNT shows the hardening effect(high strength, high modulus and high ductility) when compared to the composite with untreated MWCNT. On the other hand, the composite with APFP treated CB shows the softening effect(high strength, low modulus and high ductility) when compared to the composite with untreated CB. As the refluxing time increases from 1hr to 2hrs and the sulfuric acid concentration increases from 60% to 90%, the tensile strength and modulus of the composite decrease. Overall, it is found that the MWCNT content, CB content, APFP treatment, sulfuric acid concentration and refluxing time have an important effect on the mechanical properties of NBR composites.
탄소나노튜브 및 카본블랙 강화 고무복합재료의 변형에 의한 결정화가 기계적 특성에 미치는 영향
성종환(Jong Hwan Sung),류상렬(Sang Ryeoul Ryu),이동주(Dong Joo Lee) 대한기계학회 2011 大韓機械學會論文集A Vol.35 No.9
고무복합재료에 대해 변형에 의한 결정화(SIC)가 기계적 특성에 미치는 영향을 연신율(λ) 및 다중벽 탄소나노튜브(CNT)와 카본블랙(CB)의 함유량을 함수로 하여 연구하였다. 시차 주사 열량(DSC) 분석을 통해 CB 및 CNT의 함유량에 따라 결정화 정도가 증가함을 확인 하였다. 또한 연신율이 증가함에 따라 복합재료의 유리전이온도(Tg)는 증가하였고, 결정화 잠열 값(LHc)은 λ=1.5에서 최대값을 보였다. CNT의 함유량 증가에 따라 기계적 특성과 LHc는 비례관계임을 확인하였다. 열 중량 분석(TGA)을 통해 기지의 소실율은 94.3%였고, 복합재료의 소실율은 보강재의 함유량 증가에 따라 감소하였다. 인장탄성율 비는 고무 내의 CNT 배향으로 인장강도 비보다 높게 나타났다. The effects of strain-induced crystallization (SIC) on the mechanical properties of elastomeric composites as functions of extension ratio (λ), multiwalled carbon nanotube (CNT) content, and carbon black (CB) content are investigated. The differential scanning calorimetry (DSC) analysis shows that the degree of crystallinity increases with the increase in the CB and CNT content. As λ increases, the glass transition temperature (Tg) of the composites increases, and the latent heat of crystallization (LHc) of the composites is maximum at λ=1.5. It is found that the mechanical properties have a linear relation with LHc, depending on the CNT content. According to the TGA (thermogravimetric analysis), the weight loss of the composite matrix is 94.3% and the weight of the composites decreases with the filler content. The ratio of tensile modulus (Ecomp/Ematrix) is higher than that of tensile strength (σcomp/σmatrix) because of the CNT orientation inside the elastomeric composites.
디지털 시대 농촌지도 방법의 효율화 방안 - 지도매체로서의 인터넷 방송의 활용 구상을 중심으로 -
성종환(Jong Hwan Sung),정환모(Han Mo Chung) 한국농촌지도학회 2000 농촌지도와 개발 Vol.7 No.2
Agricultural extension services in Korea need to build new extension system to cope with the digital age and especially with shortage of extension educators which has been originated from the changing status from central to local government. The new trends including development of multi-media, wide-spreading of internet, and advent of internet broadcasting are offering the opportunities for new agricultural extension service. Utilization of agricultural internet broadcasting could be a new alternative for enhancing the efficiency of agricultural extension services. Agricultural Internet broadcasting could support decision making of farmers by forwarding unique agricultural data which have been collected, compiled and processed by the Rural Development Administration. Farmers will be able to search useful agricultural data through agricultural Internet broadcasting for more efficient farm management and marketing farm products. Agricultural Internet broadcasting could utilize more prompt and abundant agricultural technology and management data compiled by the Rural Development Administration, and through this process, agricultural Internet broadcasting could compensate the shortage of extension manpower. Through feedback process of agricultural Internet broadcasting. farmers will be able to communicate more efficiently with extension educators to increase agricultural production and income. Agricultural Internet broadcasting could be an alternative to prevent farmers from being shunned in the information-based society.
탄소나노튜브 및 카본블랙 강화 고무복합재료의 변형에 의한 결정화가 기계적 특성에 미치는 영향
성종환(Jong Hwan Sung),류상렬(Sang Ryeoul Ryu),이동주(Dong Joo Lee) 대한기계학회 2010 대한기계학회 춘추학술대회 Vol.2010 No.11
Strain-induced-crystallization(SIC) effects on mechanical properties of elastomeric composites are investigated as functions of extension ratio(λ), multi-walled carbon nano-tube(CNT) content and carbon black(CB) content. DSC(differential scanning calorimetry) analysis shows that the degree of crystallinity increases with the increase of CNT content. As the extension ratio increases, the Tg(glass transition temperature) and LHc(latent heat for crystallization) of the composite increase due to increasing the degree of crystallinity. It is found that the mechanical properties have a linear relation with the LHc depending on the CNT content. According to the TGA(thermogravimetric analysis), a weight loss of matrix is 94.3% and those of composites decrease with the filler content. The tensile strength and modulus gradually increase with increasing CNT content when compared to the pure and the filled rubbers with same amount of CB. The ratio of the tensile modulus is higher than that of tensile strength because of the CNT orientation inside the rubber. The tensile strength and modulus of the composites with the CNT content 9phr increases up to 31% and 91%, respectively, compared to the matrix.