아라미드 직물의 열적 성질과 역학 성질에 관한 연구

안승국(Seung Kook An) 한국염색가공학회 1999 韓國染色加工學會誌 Vol.11 No.1

열, 염산 및 수산화나트륨 처리에 의한 Vectran^® 섬유의 특성 변화

백영미,안승국,Baek, Young Mee,An, Seung Kook 한국섬유공학회 2014 한국섬유공학회지 Vol.51 No.5

In this study, research was conducted on $Vectran^{(R)}$ fibers (highly heat resistant, high strength, lightweight industrial fibers) to determine their suitability for use in the development of hybrid wires and cables. Vectran fibers were heat-treated to various temperatures and treated with HCl and NaOH solutions under various conditions. The effects of heat, HCl, and NaOH treatment on the creep behaviors, mechanical properties, and surface properties of Vectran fibers were examined. X-ray diffraction (XRD) analysis was used to investigate crystallinity changes; while Fourier transform infrared spectroscopy (FT-IR) and X-ray photoelectron spectroscopy (XPS) were used to analyze chemical structure changes resulting from degradation. Analysis showed that the mechanical properties and crystallinity of Vectran fibers changed significantly by treatment at temperatures greater than $250^{\circ}C$. Although HCl treatments did not cause significant changes, NaOH treatments resulted in considerable changes in the surface and mechanical properties and crystallinity. FT-IR and XPS analyses indicated that the degradation resulted from the hydrolysis of ester bonds in the fibers.

셀룰로스 섬유를 이용한 감성쾌적소재 개발 (I) -의마가공이 직물의 태 및 열전달 특성에 미치는 영향-

정원영,안승국,이양헌,Jeong, Won-Young,An, Seung-Kook,Lee, Yang-Hun 한국섬유공학회 2010 한국섬유공학회지 Vol.47 No.3

Linen fabric is one of the most traditional fabrics for summer clothing because of its high permeability and cool feeling. However, it has some demerits such as low dyeability, poor dimensional stability, and high cost, which has encouraged the development of linen-like finishing based on cellulose materials. In this research, we evaluated the linen-like effects of cotton fabric on the objective hand value and heat transport properties with various concentrations of NMMO aqueous solution. Solvent bonding of cotton fabric through the treatment with NMMO aqueous solution was observed above 30% concentration. Primary hand values were calculated by KN-101-SUMMER equation for translating fabric mechanical parameters into hand values for summer suit fabrics. Stiffness(KOSHI) and anti-drape stiffness (HARI) remarkably increased with the concentrations of NMMO aqueous solution. It will provide a merit for summer clothing, which does not clinging to the skin during sweating.

용접 보호복용 직물의 열과 수분 전달특성

하정은,전연희,안승국,Ha, Jung-Eun,Jeon, Youn-Hee,An, Seung-Kook 한국섬유공학회 2009 한국섬유공학회지 Vol.46 No.2

This study shows the thermal and moisture transfer properties of fabrics used in protective clothing for welders. The purpose of this study is to compare the performance of several fabrics used in protective clothing for welders by transfer test. The moisture transfer was affected by density and thickness of the materials. To improve emissions of water vapor, materials of lower density are suited for protective clothing. The air permeability was affected by coating agents. Silica coating has no effect on permeability of sample. On the other hand, aluminum coating has a bad influence on permeability. To improve air permeability, aluminum coated materials are not suited for protective clothing. Thermal characteristics of the materials were affected by density of the materials. Coated samples have high values of $Q_{max}$. $Q_{max}$ is warmth and coolness at instantaneous contact sense. If $Q_{max}$ shows high values, people feel cool skin sensation. The space of water and air makes the sample to have low values of heat transfer. To improve the effect of insulation, felt materials are suited for protective clothing. Felt materials are good heat blocker due to their high air contents.

머서화와 플라즈마 전처리가 방염가공 면직물의 역학 특성 및 방염성에 미치는 영향

박희영,백영미,안승국,Park, Hui Yeong,Baek, Young Mee,An, Seung Kook 한국섬유공학회 2018 한국섬유공학회지 Vol.55 No.5

The purpose of this study was to enhance the flame retardancy of cotton fabrics that are largely used for interior textiles including sleepwear, sleeping gear, and curtains by preprocessing untreated cotton fabrics. Mercerization and plasma treatments were used for preprocessing. The variables of mercerization were treatment time (5, 10 min) and temperature (0, 20, $80^{\circ}C$). The variable of plasma is treatment time (5, 10, 15 s). To compare the properties and dynamics between non-treated fibers and preprocessed fibers, SEM, EDAX, weight-gain percentage, transfer characteristics of water, flame retardancy, and a KES-FB system were used. The plasma-treated fabrics exhibited less property change than the mercerization-treated fabrics. The mercerized fabrics had more outstanding features in terms of flame retardancy. The best flame retardancy among the experimental conditions was observed in the condition of processing for 5 min by low-temperature mercerization.

윈도우 커버링용 PET 난연 직물의 마모 및 역학특성

이경희,전연희,안승국,Lee, Kyung Hee,Jeon, Youn Hee,An, Seung Kook 한국섬유공학회 2013 한국섬유공학회지 Vol.50 No.2

This study examined the abrasion and mechanical properties of poly(ethylene terephthalate) (PET) flameretardant fabrics used for window coverings. The tensile linearity, tensile resilience, bending rigidity, bending hysteresis, shearing stiffness, shearing hysteresis, compression energy, and surface roughness all increased with increasing fabric density and cover factor ratio. Five samples were subjected to more than 16,000 cycles for the abrasion resistance test and to grade 4 for the snagging test. The drape test showed that the flexibility of the samples was affected by fabric density and cover factor ratio.

초음파 조사 및 프리프레그 열처리가 탄소섬유강화 하이브리드 복합재료의 물성에 미치는 영향

오도향,백영미,안승국,Oh, Do Hyang,Baek, Young Mee,An, Seung Kook 한국섬유공학회 2012 한국섬유공학회지 Vol.49 No.6

The purpose of this study is to improve interfacial adhesion strength of carbon fiber reinforced hybrid composites by physical and chemical treatment. Ultrasonic irradiation was used as physical and chemical treatment relatively. The morphologies of fracture-section and surface of carbon fiber fabric/CNT reinforced hybrid composites were observed by SEM. The morphologies of specimens treated with ultrasonic showed rougher and more compact surfaces than those of untreated specimens. The specimens treated with ultrasonic showed higher impact strength compared with untreated specimens. This result showed ultrasonic irradiation is one of the effective method to improve interfacial adhesion strength between carbon fiber and matrix.

실리콘 수지조성물 코팅에 따른 실리카 직물의 방화 성능

라해준,배진화,안승국,Na, Hae-Joon,Bae, Jin-Hwa,An, Seung-Kook 한국섬유공학회 2011 한국섬유공학회지 Vol.48 No.4

High-temperature fire-resistant materials are required to enhance the fire-related safety of high story buildings. In this study, the thermal protection performance of protective textiles was evaluated, and these materials were based on silica fabrics coated with silicon resins of different formulations. The fabrics with larger coating thickness had higher $t_{12}$ and HTI values, as expectedly. In addition to the positive effect seen after vermiculite addition, the addition of aerogels in to the coating resin improved substantially the fire-proofing performance, even in very small amounts. However, the small additions to the resin caused a rapid rise in resin viscosity and caused spreading problems on the silica fabrics. Therefore, toluene was required as a solvent. All coated samples showed very high thermal stability with very small volume decreases even at temperatures as high as $900^{\circ}C$. The coated silica fabrics with silicon resin are expected to be used as screen shutters in the case of fire.

HDI가 대나무/PBS 복합소재의 역학특성에 미치는 영향

이금미,오애경,안승국,Lee, Geum Mi,Oh, Ae Gyeong,An, Seung Kook 한국섬유공학회 2016 한국섬유공학회지 Vol.53 No.1

The purpose of this study is to improve the interfacial adhesion strength of bamboo/PBS composites by adding HDI (hexamethylene diisocyanate) as a coupling agent. Bamboo/PBS composites with HDI were fabricated by an internal mixer and a hot press machine. In addition, the effects of HDI as a coupling agent and various HDI contents on the mechanical properties of bamboo/PBS composites were investigated. Furthermore, the tensile properties, flexural properties, and Rockwell hardness of bamboo/PBS composites with HDI were evaluated. The obtained results showed that the mechanical properties of bamboo/PBS composites were improved with the addition of HDI. The morphology of fractured surfaces of bamboo/PBS composites was observed with SEM (scanning electron microscope), and the obtained SEM images showed evidence of improved interfacial adhesion between the bamboo fiber and PBS matrix. To analyze the composition change of bamboo/PBS composites, FT-IR (Fourier transform-infra red) spectroscopy was used. The FT-IR spectra of bamboo/PBS composites also showed positive effects of using HDI as a coupling agent. Finally, a comparison of various HDI contents, when all obtained results were combined, showed that bamboo/PBS composites with a HDI content of 1.5% had the most improved mechanical properties.

보호복의 방열성능 평가

신동승,전연희,한상미,안승국,이의소,Shin Dong-Seung,Jeon Youn-Hee,Han Sang-Me,An Seung-Kook,Lee Eui-So 한국섬유공학회 2006 한국섬유공학회지 Vol.43 No.1

The evaluation for thermal protective performance of protective clothing against heat and flame was studied. In the case of protective clothing for workers, it has a good thermal stability with convective and radiant heat test. But the garments for firefighters were not the case. Although they had a good thermal stability to the convective heat test, they were not stable to the radiant heat test. This outcomes are a matter of grave concern. In spite that they failed in the radiant heat test, they still passed the standard by the current evaluation methods. Therefore it is necessary that the present evaluation methods of protective clothing should be complemented and revised.