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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.
탄소섬유 펼침 기술을 적용한 CF/PA6 적층 복합재료의 특성
박성민,김명순,최윤성,이은수,천진성,유호욱,Park, Sung-min,Kim, Myung Soon,Choi, Yoon Sung,Lee, Eun Soo,Chon, Jin Sung,Yoo, Ho Wook 한국섬유공학회 2015 한국섬유공학회지 Vol.52 No.6
This paper reports the preparation of CF/PA6 (Polyamide 6) laminate composites using tow-spreading technology. Additionally, the effect of the spread tow on impregnation was investigated by Darcy's law. The thickness of an unspread 12K carbon fiber tow was reduced by increasing the tow width from 7 to 20 mm. The PA6 film was used to stabilize and impregnate the spread tow by covering it with a partially consolidated prepreg:12K carbon fiber spread tow/PA6 film. The laminate composites were fabricated from the prepreg and, for comparison, the other laminate composite was produced from a conventional tow prepreg of 12K carbon fiber/PA6 film. Consequently, the spread tow laminate composite exhibited a lower void content and improved mechanical properties.
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.
탄소섬유 펼침 기술 및 이를 적용한 적층 복합재료의 기계적 특성
박성민 ( Sungmin Park ),김명순 ( Myungsoon Kim ),최윤성 ( Yoonsung Choi ),이은수 ( Eunsoo Lee ),유호욱 ( Howook Yoo ),천진성 ( Jinsung Chon ) 한국복합재료학회 2015 Composites research Vol.28 No.5
본 연구는 탄소섬유 펼침 기술을 이용한 적층 복합재료의 특성을 평가하였다. 섬유 펼침 기술이 적용되어 기존 12 K 탄소섬유 토우의 폭이 7 mm에서 20 mm로 늘어나면서 두께가 더 얇아졌다. 폴리프로필렌 필름을 spread tow에 함침시켜 프리프레그를 만들고 이를 적층 후 열압축 성형을 통해 시편을 제조하였으며 이들의 기공함유량 및 인장, 굴곡 시험을 통해 물리적, 기계적 물성을 평가하였다. 그 결과, 탄소섬유 펼침 기술이 적용된 적층 복합재료의 기공함유량이 기존의 섬유 토우를 사용한 것보다 작게 나타났고, 섬유함유량이 낮았음에도 불구하고 기계적 물성이 향상됨을 알 수 있었다. This paper reports a study on a method for achieving lightweight thermoplastic laminate composites referred to as tow spreading technology. Thickness of an unspread 12 K carbon fiber tow is reduced by increasing the tow width from 7 mm to 20 mm. The polypropylene (PP) film was used to stabilize and impregnate the spread tow, covering it into a partially consolidated prepreg: 12 K carbon fiber spread tow/PP. Laminates were fabricated from the spread tow prepreg and control laminate composites were produced from unspread tow prepreg consisting of 12 K carbon fiber and PP. The void content, tensile and flexural properties of the composite laminates were investigated. Consequently, the spread tow laminate composite exhibited lower void content and improved mechanical properties.