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NCO 지수와 숙성 조건에 따른 무용제형 폴리우레탄 인조피혁의 물리 화학적 특성에 관한 연구
은종현,이준석,유호욱,배한조 한국섬유공학회 2019 한국섬유공학회지 Vol.56 No.2
In this study, we investigated the chemical and physical properties of polyurethane artificial leather. Polyurethane artificial leather was prepared from polyol, diisocyanate, a chain extender, a catalyst, and nylon circular knit fabric. After manufacturing the artificial leather, the properties of six different samples were investigated according to their NCO index and ripening temperature. The equivalence ratios of the isocyanates (NCO) to polyols containing a hydroxyl group are referred to as the NCO index. Samples with an NCO index of 1.0, 1.4, and 1.8 were synthesized by changing the weight ratio of diisocyanate. Polyurethane artificial leathers were synthesized by varying the ripening temperature at room temperature and 60 °C. As the NCO index increased, the number of unreacted NCO functional groups increased, thereby improving the physical properties of polyurethane artificial leathers. When the samples were prepared at a ripening temperature of 60 °C, the surface of the polyurethane artificial leather changed, and the physical properties improved.
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스프레드 탄소섬유 직물 복합재료의 성형온도에 따른 기계적 특성에 관한 연구
은종현,곽재원,김기정,김민성,성선민,최보경,김동현,이준석 한국복합재료학회 2020 Composites research Vol.33 No.3
In this paper, we have studied the mechanical properties of thermoplastic carbon fiber fabric composites with spread technology and compression molding temperature were investigated. Carbon fiber reinforcement composites were fabricated using commercial carbon fiber fabrics and spread carbon fiber fabrics. Mechanical properties of the commercial carbon fiber composites (CCFC) and spread carbon fiber composites (SCFC) according to compression molding temperatures were investigated. Thermal properties of the polypropylene film were examined by rheometer, differential scanning calorimetry, thermal gravimetric analysis. Tensile, flexural and Inter-laminar shear test. Commercial carbon fiber reinforcement composites and spread carbon fiber composites were fabricated at 200~ 240°C above the melting temperature of the polypropylene film. Impregnation properties according to compression molding temperature of the polypropylene film were investigated by scanning electron microscopy. As a result, as the compression molding temperature was increased, the viscosity of the polypropylene film was decreased. The mechanical properties of the compression molding temperature of 230°C spread carbon fiber composite was superior. 본 연구에서는 스프레드 기술이 적용된 열가소성 탄소섬유 복합재료의 성형 온도에 따른 기계적 특성과폴리프로필렌 필름의 열적 특성에 대해 조사하였다. 스프레드 기술이 적용된 탄소섬유 직물과 범용 탄소섬유 직물로 탄소섬유 강화 복합재료를 제작하였고, 시차 열량 주사계(DSC), 열 중량 분석법(TGA), 점도계를 사용하여폴리프로필렌 필름의 열적 특성을 측정하였다. 인장, 굽힘, 층간 전단 실험을 통해 복합재료 성형 온도 조건에 따른 스프레드 탄소섬유 복합재료(SCFC)와 범용 탄소섬유 복합재료(CCFC)의 기계적 특성을 확인하였다. 폴리프로필렌 수지의 융점 이상인 200~240oC 구간에서 복합재료를 제작하였으며, 주사 전자 현미경(SEM) 분석을 통해 성형 온도 조건에 따른 열가소성수지의 함침성을 관찰하였다. 그 결과, 성형 온도가 증가함에 따라 폴리프로필렌 수지의 점도가 감소하여 함침성이 향상되었으며, 230oC 성형 온도 조건에서 기계적 특성이 가장 우수한 것을 확인하였다.
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항공기용 스트링거 제작을 위한 브레이드 복합재료의 물성에 관한 연구
은종현,이준석,박승환,김동현,천진성,유호욱 한국복합재료학회 2018 Composites research Vol.31 No.6
본 논문에서는 항공기용 스트링거(Stringer)로 사용하기 위한 브레이드 복합재료(Braided composites)의 물성에 대해 연구하였다. 브레이드 프리폼(braid preform)을 30°, 45°, 60°로 제작하기 위해 드럼 와인더 속도, 브레이드 속도, 멘드럴 직경과 같은 공정변수들을 정량화시켰고, 에폭시 수지 종류를 TGDDM, YD-128로 브레이드 프리폼에 다르게 적용하여 각도에 따른 브레이드 복합재료의 인장강도, 굽힘강도를 섬유부피분율에 따라 규명하였으며, TGA 분석으로 열적 특성과 에폭시 수지의 분해 온도를 조사하였다. 그 결과 브레이드 프리폼의 각도가 낮을수록 인장강도와 굽힘강도가 향상됨을 확인하였고, 분자량이 높은 에폭시 수지를 사용할 때 물리적 성질이 향상되었다. In this paper, we have studied the physical properties of braided composites for use as aircraft stringers. Process variables such as drum winder speed, braid velocity, and mandrel diameter for 30°, 45° and 60° braid preforms were quantified and different epoxy resin types were applied to the braided preform using TGDDM, YD- 128. Physical properties such as tensile strength and flexural strength of braided composites were investigated. Thermal properties and decomposition temperature of epoxy resin were investigated by TGA analysis. As a result, the lower the angle of the braid composites, the higher the tensile strength and the Flexural strength. The physical properties of braided composites fabricated using TGDDM epoxy resin were superior to the physical properties of braided composites fabricated using YD-128 epoxy resin. This is because the molecular weight of TGDDM epoxy resin was higher than that of YD-128 epoxy resin.
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증례보고 : HELLP 증후군이 동반된 자간전증 산모의 제왕절개술 후 진단된 뇌내출혈
송재격 ( Jae Gyok Song ),김석곤 ( Seok Kon Kim ),은종현 ( Jong Hyun Eun ) 대한마취과학회 2009 Korean Journal of Anesthesiology Vol.56 No.5
Intracerebral hemorrhage (ICH) is one of very dangerous complications of preeclampsia/eclampsia. We experienced postoperative ICH in a 39-year-old woman with preeclampsia and HELLP syndrome. The paturient complained severe headache and upper abdominal pain with nausea and vomiting. Her initial blood pressure was 190/120 mmHg and her heart rate was 80 beat/min. The diagnosis of preeclampsia with HELLP syndrome was confirmed by the severe hypertension and the laboratory findings. She was drowsy at the emergency room but she lost consciousness when transferring to the operation room. Caesarean section was done under general anesthesia. After the operation she could not recover self-respiration and consciousness. Her brain CT showed ICH in the basal ganglia with intraventricular hemorrhage and severe brain edema. She expired one the 5 th post operative day due to brain death and multiple organ failure. Early diagnosis is the key to treating ICH. (Korean J Anesthesiol 2009;56:592~6)
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