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노예지,김성륜,김한상 한국고분자학회 2014 Macromolecular Research Vol.22 No.11
A fabrication method was developed to enhance the processability of a thermoplastic composite reinforcedwith a carbon nanotube (CNT) mat using an in situ polymerizable low-viscosity cyclic butylene terephthalate(CBT) oligomer. We obtained excellent electrical, thermal, and mechanical properties in the in-plane direction of theprepared CNT mat composites. For the CNT mat composites, the highest thermal diffusivity of 1.53×10-5 m2/s wasobtained in the in-plane direction due to the continuously and fully connected CNTs within the CNT mat filler andthe value was higher than that of alumina. The properties depended on the internal structure of the composites, suchas the development of the morphology, waviness, and weight fraction of the CNT mat within the composites. Theseexcellent properties were revealed under optimum processing conditions with combined high compression pressure,short processing time, and quenching to induce an ideal structure in the CNT mat within the composites.
유리섬유와 유리버블에 의한 Sheet Molding Compound 강도의 시너지 효과
노예지,이용철,황태원 한국복합재료학회 2018 Composites research Vol.31 No.1
Sheet molding compound (SMC) is one of the most economical fiber reinforced composite fabrication processing for automotive applications. In this study, we studied the optimum formulation for the production of SMC which shows low specific gravity without lowering the mechanical properties by using glass bubble (GB) which is a low specific gravity filler and glass fiber (GF) as a reinforcing material. The tensile strength increased with the increase of the GF in the SMC, and the specific gravity decreased with the increase of the GB. The synergistic effect of improving the mechanical properties as the specific gravity is lowered is found in the optimum formulation. The synergy effect was confirmed by the internal structure analysis that the dispersion effect of the crack propagation of the GB and the improvement of the binding force between the fiber and the matrix due to the incorporation of the GB. 섬유강화 복합재료 제조 방법 중 sheet molding compound(SMC)는 자동차에 적용 가능성이 가장 높은 소재이다. 본 연구에서는 저비중 필러인 유리버블과 강화재인 유리섬유를 사용하여 물성이 저하되지 않으면서 낮은 비중을 나타내는 SMC의 제조를 위한 최적의 배합비에 대해 연구하였다. SMC 내부에 유리섬유의 혼입양이 증가할수록 강도가 향상하였고, 유리버블의 혼입양이 증가할수록 비중이 낮아졌다. 최적의 배합에서는 비중이 낮아지면서 물성이 향상되는 시너지 효과가 나타남을 발견하였다. 이러한 시너지 효과는 유리버블의 크랙 전파의 분산 효과와 유리버블의 혼입에 따른 섬유와 매트릭스의 결합력의 향상에 기인한 것임을 내부구조 분석을 통해 확인하였다.
노예지,김성륜,이성호,윤재륜 한국고분자학회 2014 Macromolecular Research Vol.22 No.5
A weight savings of approximately 30% of the total weight of an automobile can be achieved if highspeedmass production of the continuous carbon fabric reinforced composites (CCFRCs) is possible. In this study,we analyzed the high-speed production of thermoplastic CCFRCs with a 2 min processing time using a polymerizable,low-viscosity thermoplastic cyclic butylene terephthalate (CBT) resin. Along with the reduced processing time,superior mechanical properties were obtained in the CCFRC specimen, such as a tensile strength of 440 MPa and animpact strength of 44 KJ m-2. This could be achieved because a high carbon fiber content of 70% volume could bereached with few pores or defects in the CCFRC. The proposed high-speed production of the thermoplastic CCFRCcan compete with metal pressing due to its short processing time of only a few minutes, which is the time limit currentlyaccepted by the automotive industry.
고지방식이 유도 비알콜성지방간 마우스 모델에서 육신국(六神?)의 지방간(脂肪肝) 개선효과
노종성 ( Jong Seong Roh ),이혜림 ( Hye Rim Lee ),안예지 ( Ye Ji Ahn ),윤미정 ( Mi Chung Yoon ),신순식 ( Soon Shik Shin ) 대한본초학회 2014 大韓本草學會誌 Vol.29 No.2
Objectives : This study was undertaken to verify the effects of Massa Medicata Fermentata (MMF) on nonalcoholic fatty liver disease (NAFLD) using high fat diet-fed male mice. Methods : Fifty four male C57BL/6N mice (age matched) were used for all experiments. Nine standard chow diet-fed mice were used as normal group and forty five high fat diet-fed obese mice were randomly divided into 5 groups: control, atorvastatin-10㎎/㎏, MMF(1)-62.5㎎/㎏, MMF(2)-125㎎/㎏ and MMF(3)-250㎎/㎏. After all groups were treated with several kinds of diets for 8 weeks, we measured body weight gain, adipose tissue weights, plasma lipid and glucose metabolism, visceral organ weights, histological analysis for liver on the mice. Results : MMF-treated mice had lower body weight gain compared with controls. Among MMF-treated mice, the effect was magnified in MMF(2). MMF(3)-treated mice had lower blood plasma total cholesterol (TC) and glucose level compared with controls. MMF decreased hepatic lipid accumulation, liver fibrosis and liver inflammation of mice compared with controls. The effects was maximized in MMF(2) and atorvastatin. Blood plasma aspartate aminotransferase (AST), alanine aminotransferase (ALT), γ-glutamyltransferase (γ-GT) concentrations tends to be decreased by MMF compared with controls. Blood plasma AST, ALT, γ GT concentrations and organ weights were not changed by MMF, indicating that all three kinds of MMF do not show any hepatotoxicity. Conclusions : These results suggest that MMF improves NAFLD by reducing body weight gain, hepatic lipid accumulation, liver fibrosis, liver inflammation.