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난연제/몬모릴로나이트로 보강된 SBR 나노복합체의 난연 특성
성일경(Il Kyung Sung),이원기(Won-Ki Lee),박찬영(Chan Young Park) 한국고분자학회 2017 폴리머 Vol.41 No.2
본 연구에서는 난연제인 염화파라핀 왁스(CPW)를 변량하여 합성고무(SBR)/몬모릴로나이트(MMT) 나노복합체를 제조하여 기계적 특성과 난연 특성을 검토하였다. 시료(T-1~T-8)를 제조하기 위하여 MMT(Cloisite 15A)는 10 phr로 고정하였고, CPW의 함량은 각각 0, 10, 20, 30 phr으로 변량하였다. 난연제만 첨가된 SBR 컴파운드보다 SBR/MMT 나노복합체의 기계적 물성과 열적 물성이 증가하였고, 난연제인 CPW 함량이 높을수록 기계적 물성은 저하되었다. SBR/MMT 나노 복합체에 대한 한계산소지수(LOI) 시험 결과로부터 CPW 함량이 20 phr 이하인 경우 LOI 값은 22.3~26.4%를 나타내었지만, CPW 함량이 30 phr 첨가시 산소지수는 30.2%로 향상됨을 알 수 있었다. 난연 등급 시험에서는 30 phr의 난연제 함량을 갖는 SBR/MMT 나노복합체가 UL 94 V-0급에 해당하는 우수한 난연 특성을 얻었다. Synthetic rubber (SBR)/montmorillonite (MMT) nanocomposites with varying contents of chlorinated paraffin wax (CPW) as flame retardant were prepared, and then investigated the mechanical properties and the flame retardant properties of the nanocomposites. The content of MMT was fixed on 10 phr and that of CPW was varied on 0, 10, 20, 30 phr, respectively. The mechanical and thermal properties of SBR/MMT nanocomposites than those of the SBR compound added with flame retardants were increased, and that increasing of CPW content resulted in decreasing of the mechanical properties. From the results of limited oxygen index for the SBR/MMT nanocomposite, limiting oxygen index (LOI) value of CPW contents less than 20 phr represented 22.3~26.4%, and also that of 30 phr CPW contents improved to 30.2%. In the UL 94 measurement test, the SBR/MMT nanocomposites with flame retardant content of 30 phr were shown excellent flame retarding characteristics equivalent to UL 94 V-0 grade.
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성일경 ( Sung-il Kyung ) 대한무용학회 2018 대한무용학회논문집 Vol.76 No.2
The purpose of this study was to understand how ballet experience in changes unmarried women's daily life in the aspects of motivation, continuous participation, physical and mental status. For this purpose, the author observed and interviewed five women in D metropolitan city adult ballet classes. For the result, the first experience was psychological separation from stress. The second change was related to the body shape. This change caused an effort to maintain this positive status of the body. Last but not least, participants had positive ways of thinking to accommodate ballet as a ballet itself, not just exercise.
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Yong-Hwan Kim(김용환),Seung-Hwan Lee(이승환),Il-Kyung Sung(성일경),Yu-wool Lee(이여울),Myungchang Kang(강명창) 한국기계가공학회 2018 한국기계가공학회지 Vol.17 No.6
A concrete docking hose of pump car’s boom pipe line have been used in many construction sites. They are long structures with continuous cornering, similar to a trunk of the elephant, characterized by a very high pressure resistance of 20MPa. They need flexible materials and structure in order to move the hose smoothy. But commercial concrete hose is hard to handle and heavy owing to adaption of steel reinforcement. In this study, it is tried an experimental approach to the characteristic of inner rubber layer and abrasion resistance. Also, we are investigated the bursting pressure according to the reinforcement of the hose and propose the usefulness of the hose reinforced with high strengthened aramid fiber.
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가속 열 노화시험을 이용한 침매터널용 고무 씰 소재의 사용수명 예측
박준형(Joon Hyung Park),박광화(Kwang Hwa Park),박형근(Hyeong Geun Park),권영일(Young Il Kwon),김종호(Jong Ho Kim),성일경(Il Kyung Sung) 한국신뢰성학회 2009 신뢰성응용연구 Vol.9 No.4
This paper considers accelerated thermal degradation tests which are performed for rubber seal materials used for undersea tunnels constructed by immersion method. Three types of rubber seals are tested; rubber expansion seal, omega seal, and shock absorber hose. Main ingredient of rubber expansion seal is EPDM(Ethylene Propylene Diene Monomer) and that of both omega seal and shock absorber hose is SBR(Styrene Butadiene Rubber). The accelerated stress is temperature and an Arrhenius model is introduced to describe the relationship between the lifetime and the stress. From the accelerated degradation tests, dominant failure mode of the rubber seals is found to be the loss of elongation. The lifetime distribution and the service life of the rubber seals at use condition are estimated from the test results. The acceleration factor for three types of rubber seals are also investigated.
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