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폴리에틸렌테레프탈레이트와 나일론 6 알로이 섬유의 구조와 성질(II) -알로이 섬유의 제조와 물성 분석-
민병길,임목근,이광상,유영출,한재성,Min, Byung Gil,Lim, Mok Keun,Lee, Kwang Sang,Yu, Yeong-Chool,Han, Jae Sung 한국섬유공학회 2014 한국섬유공학회지 Vol.51 No.5
The preparation of polymer alloys from immiscible blends of poly(ethylene terephthalate) (PET) and nylon 6 was investigated using epoxy as a reactive compatibilizer during melt compounding. The domain size of nylon 6 in the PET matrix could be controlled to the submicron level by addition of 0.5-2.0 wt% epoxy to the blends. Melt spinning of the alloys were successfully performed in a pilot scale. The alloy fibers containing 5-10 wt% nylon 6 exhibited reasonable mechanical properties, with up to 3 g/d tenacity and 35% elongation. Moreover, the alloy fibers showed improved moisture absorption properties compared with that of neat PET fibers.
Poly(p-phenylene benzobisoxazole)/Single-walled Carbon Nanotube (SWNT) 복합섬유의 모폴로지에 관한 연구
민병길,Min, Byung-Gil,Kumar, Satish 한국섬유공학회 2007 한국섬유공학회지 Vol.44 No.1
Poly(p-phenylene benzobisoxazole) (PBO) was synthesized in the presence of single-walled carbon nanotubes (SWNTs) in poly(phosphoric acid) (PPA) using typical PBO polymerization conditions. PBO and PBO/SWNT composite fibers were prepared by spinning liquid crystalline solutions in PPA. The morphology and properties of PBO/SWNT composite fibers was investigated. The fibril structure was well developed in PBO/SWNT fibers as well as PBO fiber. However, the SWNT rope was not observed in the inner structure of the peeled fibers, implying that SWNT ropes are exfoliated into the individual nanotube in the solution. After tensile fracture the kink bands are observed in the composite fibers similar to PBO fibers. The observation is consistent with the insignificant effect of SWNT on the compressive strength of PBO fiber.
수화용융체를 이용한 아크릴섬유의 제조와 특성에 관한 연구(I) -폴리아크릴로니트릴 수화용융체의 등온결정화 거동-
민병길,조원호,Min, Byung-Gil,Jo, Won-Ho The Korean Fiber Society 2007 한국섬유공학회지 Vol.44 No.2
Melting and isothermal crystallization behaviors of plasticized polyacrylonitrile (PAN) on adding water in a sealed state were studied. As water was added, the melting point of PAN was depressed sharply to reach a plateau region in which all the nitrile groups of the polymer were hydrated. The crystallization exotherms of PAN/water mixture showed complex profiles. On DSC analysis, it was found that the exotherm from the crystallization (dehydration) heat of the hydrated PAN was overlapped with the latent heats by the neat PAN and water which was not evolved during quenching. Thus, in order to investigate the dehydration kinetics of PAN/water mixture, it was required to separate the exothermic peak by the isothermal crystallization from the peaks by the evolution of latent heats of the each component, i.e., PAN and water. By subtraction of the latent heat contributed by neat PAN and water from the all isothermal exothermic heat of PAN/water mixture, the isothermal crystallization peak of PAN/water mixture was successfully obtained according to various crystallization temperature ($T_c$).
민병길(Byung-gil Min),안우근(Woogeun Ahn),서정택(Jungtaek Seo) 한국정보보호학회 2014 情報保護學會誌 Vol.24 No.1
각종 악성코드와 취약점이 하루가 다르게 출현하고 있다. 주기적인 취약점 분석·평가는 새로운 사이버보안 위협에 신속하게 대응하고 지속적으로 사이버보안을 강화하는 중요한 활동이다. 그러나 최근 스마트폰 이용 확산에 따른 모바일 보안위협 증가와 기반시설 제어시스템에 대한 보안위협 증가는 기존 취약점 분석·평가 방법의 구조적인 변화를 요구하고 있다. 본 논문에서는 스마트폰 테더링과 같은 모바일 보안위협에 따른 취약점 분석·평가 시의 고려사항과 시스템 영향을 최소화 할 수 있는 분석 절차와 방안을 제시하고 있다. BYOD를 사용한 모바일 인터넷 사용은 내·외부 네트워크 구분을 무의미하게 만들고 있기 때문에 다양한 침입경로에 대한 분석이 필요하다. 또한 제어시스템과 같이 높은 가용성이 요구되는 시스템에 대해서는 유휴시간 점검, 백업 시스템 점검, 테스트 베드 등을 사용한 취약점 점검 방법의 도입이 필요하다.
조징,민병길,Zhou, Jing,Min, Byung Gil 한국섬유공학회 2014 한국섬유공학회지 Vol.51 No.2
The effect of a reactive compatibilizer on the morphology, and thermal and rheological properties of alloy fibers obtained from poly(ethylene terephthalate) (PET)/polyamide 6 (PA6) blends was investigated. An epoxy of bisphenol-A type was selected as the reactive compatibilizer for preparing the polymer alloy fibers by enhancing the compatibility of immiscible blends of PA6 and PET. The PET/PA6/epoxy alloy is expected to be used for preparing practically useful alloy fibers with various advantages such as low cost and high moisture absorption. The PA6/PET/epoxy alloy was successfully prepared via melt compounding by using a twin-screw extruder. The domain size of the poor component decreased enough to result in alloy fibers with reasonable mechanical properties. Further, it was found that the cold crystallization temperature of PA6 in the alloy decreased with increasing epoxy amount, but that of PET increased owing to the significant difference between the crystallization rates of PET and PA6. The $T_g$ values for both polymers in the alloy showed a shift along the direction between them. All the results implied that chemical reactions occurred between epoxy and end groups of PA6 and PET, resulting in improved compatibilization.
폴리비닐알콜/히드록시아파타이트 동결융해 젤의 납 이온 흡착제거 특성 연구
박재하,민병길,Park, Jae-Ha,Min, Byung Gil 한국섬유공학회 2012 한국섬유공학회지 Vol.49 No.5
A new adsorbent for removing heavy metal lead ions from wastewater, poly(vinyl alcohol)/hydroxyapatite (PVA/HAp) composite cryogel, has been investigated. The PVA/HAp cryogel was prepared through a clean process by using water and freeze-thawing. The PVA/HAp cryogel is provided with interconnected macropores varying from 0.1 um to several um and well dispersed and immobilized HAp in cryogel. Continuous column tests of lead ion sorption were carried out to test the sorption ability of PVA/HAp cryogel. Moreover, it was found that the porosity of the cryogels was increased by adding water-soluble poly(vinyl pyrrolidone) (PVP) followed by its extraction after cryogellation. The maximum sorption capacity of the cryogels was 69 mg/g HAp for the cryogel having 20 wt% of HAp based on PVA. On the other hand, the maximum capacity was increased to 108 mg/g HAp when 15 wt% PVP based on PVA was added and extracted due to the increase of the effective HAp amount exposed to the aqueous lead ion.
조징,민병길,Zhou, Jing,Min, Byung Gil The Korean Fiber Society 2014 한국섬유공학회지 Vol.51 No.1
In this study, an epoxy (bisphenol-A type) was selected as a reactive compatibilizer for enhancing the compatibility of immiscible blends of polyamide6(PA6) and poly(ethylene terephthalate)(PET). These blends possess highly desirable qualities, such as low cost and increased moisture absorption, and can be used to construct practical polymer alloys. Using epoxy as a reactive compatibilizing agent, the compatible blends of PA6/PET/epoxy were successfully prepared through melt compounding using a twin-screw extruder. The domain size of PET decreased by a factor of two in the PA6 matrix with the epoxy. The effect of the epoxy on the melt viscosity, crystallization, and tensile properties of the blends indicates that the high-molecular weight epoxy can be an effective compatibilizer in PA6/PET blends.
Poly(p-phenylene benzobisoxazole) 고성능 섬유의 자외선 저항성 향상을 위한 표면처리 기술 연구. II. 표면처리 공정 안정화 및 성능 평가
박성우,이우성,민병길,백두현,Park, Seong Woo,Lee, Woo Seung,Min, Byung Gil,Baik, Doo Hyun 한국섬유공학회 2015 한국섬유공학회지 Vol.52 No.6
Improvements of the UV-aging resistance of poly(p-phenylene benzobisoxazole) (PBO) filament yarns, spun yarns, and woven fabrics have been investigated after surface treatment in a continuous process by using polyurethane resin and UV-absorbing and/or UV-stabilizing agents. The UV-aging resistance of PBO specimens was evaluated by tensile strength and reduction rate measurements after exposing the samples to an M400 UV lamp and solar light. A mixture of UV-absorbing (Chiguard$^{(R)}$ 234) and UV-stabilizing (Chiguard$^{(R)}$ 944) agents was found to be more effective compared to individual agents for improving the UV-aging resistance of PBO.
초음파화학 공정에 의한 파라핀계 상전이물질의 에멀전 형성과 이로 부터 멜라민-포름알데히드 수지를 벽 재료로 사용한 마이크로캡슐의 제조
한창훈,채하늘,민병길,Han, Chang-Hoon,Chae, Haneul,Min, Byung Gil 한국섬유공학회 2021 한국섬유공학회지 Vol.58 No.4
An O/W emulsion of paraffinic phase change material (PCM) was prepared through a sonochemical process for microencapsulation using melamine-formaldehyde resin as the wall material. It was found that the octadecane micelles selected as PCM were successfully formed in water with a diameter of 1-3 ㎛ through ultrasonication for 5 min. Anionic surfactants were found to be more effective than non-ionic surfactants in the formation of emulsions consisting of PCM micelles through a sonochemical process. Spherical PCM microcapsules were obtained from the PCM emulsion and melamine-formaldehyde prepolymer, which was used as the wall material. The diameter of the PCM microcapsules increased with increasing microencapsulation time and the prepolymer to PCM weight ratio.