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석유피치 재활용 탄소섬유를 혼입한 모르타르의 인장 특성
이인규,이준석,김진희,김융암,김우,Rhee, Inkyu,Lee, Jun Seok,Kim, Jin Hee,Kim, Yoong Ahm,Kim, Woo 한국자원리싸이클링학회 2017 資源 리싸이클링 Vol.26 No.6
피치계 탄소섬유를 함유한 모르타르의 직접인장강도는 평균압축강도의 1/27~1/22에 해당하였다. 동일 양의 PAN계 탄소섬유를 함유한 모르타르의 직접인장강도가 1/15임에 비하여, 낮은 수준으로 나타났다. 이 때, 무보강 기준시편의 직접인장강도는 1/29 수준이었다. 피치계 탄소섬유를 함유한 모르타르의 휨인장강도는 평균압축강도에 비해, 약 1/12 수준으로 나타났고, PAN계 탄소섬유를 함유한 모르타르와 무보강 모르타르는 각각 1/10, 1/13.5의 수준으로 나타났다. 피치계 탄소섬유를 혼입한 모르타르의 인장성능은 무보강 모르타르와 PAN계 탄소섬유를 혼입한 모르타르의 중간 수준으로 나타났다. The direct tensile strength of the mortar specimen containing pitch-based carbon fiber was ranged between 1/27~1/22 as compared to the average compressive strength of mortar. It was found that the direct tensile strength of the mortar containing the same amount of PAN-based carbon fiber was around 1/15. While the case of the control specimen without the carbon fiber was around 1/29. One the other hands, the flexural tensile strength of the mortar containing pitch-based carbon fibers was about 1/12 as compared to the average compressive strength. In case of the mortar specimen with PAN-based carbon fiber and control mortar were 1/10 and 1/13.5, respectively. The tensile performance of the mortar with pitch-based carbon fiber was found to be intermediate between control mortar and the reinforced mortar incorporated with the PAN-based carbon fiber.
전기방사된 Polyvinyl Alcohol 화이버의 열전도율 측정과 Graphene Oxide 및 Cellulose Nanocrystal 첨가에 의한 열전도율 증가
유명일(Myung Ill You),김덕은(Duk Eun Kim),김융암(Yoong Ahm Kim),신지훈(Ji hoon Shin),설재훈(Jae Hun Seol) 대한기계학회 2016 대한기계학회 춘추학술대회 Vol.2016 No.12
Application of polymer in heat management is very incomprehensive because of their very low thermal conductivity in contrast with metal. So, there are a lot of research results in improving thermal conductivity of polymer. There are several methods for improving thermal conductivity of polymer like aligning polymer chains and adding higher thermal conductivity filler. In this research, we use electrospinning system for making nano sized fiber using a kind of widely used polymer, Polyvinyl Alcohol (PVA). Very low contents of Graphene Oxide (GO) and Crystal Nano Cellulose (CNC) is used as fillers for improving polymer thermal conductivity with preserving other original properties. Thermal conductivity of Electrospun fiber is measured is measured by suspended micro device.
Crosslinked Polyacrylic Acid 나노 화이버의 열전도율 측정
박영철(Yeongcheol Park),하수민(Sumin Ha),김융암(Yoong Ahm Kim),김상원(SangWon Kim),설재훈(Jae Hun Seol) 대한기계학회 2017 대한기계학회 춘추학술대회 Vol.2017 No.11
Polymers have commonly an extremely low thermal conductivity of an order of ~0.1 W/m-K due to their chain entanglement. To overcome this drawback, many techniques have been developed such as chain drawing, blending, crosslinking. Among them, crosslinking has recently attracted lots of attention because many studies have shown the possibility of enhancement of thermal conductivity in the theoretical and numerical ways. However, several researches reported adverse effect of crosslinking on the improvement of thermal conductivity. In this work, we measured the thermal conductivity of PAA (polyacrylic acid) electrospun nanofibers, which were crosslinked and pH regulated in order to further enhance the thermal conductivity of the nanofibers.
고강도, 고강성, 그리고 유연한 탄소나노튜브 버키페이퍼-폴리우레탄 나노복합체
하유미 ( Yu-mi Ha ),임다운 ( Da-un Lim ),김융암 ( Yoong Ahm Kim ),정용채 ( Yong Chae Jung ) 한국복합재료학회 2016 Composites research Vol.29 No.4
본 연구에서는 습식초지법을 이용하여 탄소나노튜브 버키페이퍼를 제조하고 고강도, 고강성 그리고 유연성을 증대시키기 위하여 폴리우레탄(PU)의 점도를 조절하여 코팅제조한 후 기계적 특성에 미치는 영향에 대하여 살펴보았다. Raman, TGA, PL, SEM, TEM 그리고 Tensile test을 이용하여 SWNTs, SWNTs-buckypaper(SWNTs-BP), 그리고 SWNTs-BP/PU 나노복합필름에 대한 구조 및 물성을 평가하였으며 복합필름단면은 전계방사 주사전자현미경(FE-SEM)을 사용하여 관찰한 후 물성증대원인을 해석하였다. 특히, 5 wt%의 PU 용액으로 코팅할 때 튜브간의 계면 접착력 증가로 최종 물성향상에 기여하였다. 최종적으로 이러한 구조적인 특성을 이용할 경우 초경량, 고강도 나노복합소재를 제조하는데 기여할 것으로 기대된다. Carbon nanotube buckypaper (CNTs-BP)/thermoplastic polyurethane (PU) elastomer composites were successfully fabricated. The CNTs-BP/PU nanocomposites exhibited simultaneous improvements in both tensile modulus and strength by 1360 and 430%, respectively, as compared to pure PU. Possible reinforcing mechanisms were evidenced by SEM analyses and tensile tests. The CNTs-BP/PU nanocomposites can be potentially used as an interreinforcing agent in ultra-lightweight, high-strength aircraft, carbon-fiber-reinforced plastics, etc.