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PLA/PCL 블렌드의 특성 및 상용성에 관한 연구 -에스테르 교환반응 및 열적특성-
지동선,윤철수 한국섬유공학회 1999 한국섬유공학회지 Vol.36 No.1
The aliphatic poly(lactic acid)/poly($\varepsilon$-caprolactone)(PLA/PCL) blends for bioabsorbable filament sutures were prepared by melt blending. The ester interchange reaction by alcoholysis between two polymers was studied. Also, their thermal properties and miscibility changes due to the alcoholysis were investigated by FT-IR, $^1H-NMR$ and DSC analyses. It was found that PLA/PCL random copolymers have been formed during the melt blending through the ester interchange reaction by alcoholysis. The optimum blending conditions for this reaction were determined. The thermal properties of PLA/PCL blends such as melting temperature and heat of fusion were decreased with increasing interchange levels. However, the miscibility between two polymers was improved greatly by the ester interchange reaction.
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고속방사에 의해 제조된 PEN 필라멘트의 특성 : 방사속도에 따른 영향 Effects of Take-up Velocities
지동선,손준식 단국대학교 2001 산업기술연구 Vol.2 No.-
Polyethylene 2,6-naphthalate(PEN) filament by high-speed melt spinning was prepared at the take-up velocities of 1∼7 ㎞/min. The changes of the structure and physical properties caused by various take-up velocities were studied by measuring density, birefringence, x-ray diffraction, DSC, and tensile behavior. The PEN filament at high take-up velocities were show very different structure formation and properties. The orientation, especially in crystalline phase, was developed with the increase of take-up velocity. The physical properties(i.e. density, crystallinity, birefringence melting temperature, heat of fusion, tensile strength, tensile modulus)of the PEN filaments were increased with increasing of take-up velocities. These increasing tendencies were markedly appeared at the take-up velocities of 4∼7 ㎞/min by conditions due to suddenly orientation of shin molecules. The existence of extended non-crystalline molecules in the PEN filaments was appeared at take-up velocity about 4∼7 ㎞/min. It was found that they formed crystal at take-up velocity 7 ㎞/min, and their crystal
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직물의 투습성에 관한 연구(III)-직물구성인자에 의한 투습저항 평가-
지동선 한국섬유공학회 1993 한국섬유공학회지 Vol.30 No.6
A theoretical equation has been developed for the estimation of water vapor transfer resistance of worsted fabrics woven from ring spun yarns. It approximates the water vapor permeability by the Fickian diffusion law and the geometrical parameters of the fabric without tedious experimental work. In the present work. the thickness, the porosity and the open area are simultaneously taken into account in the estimation of the water vapor transfer resistance. And the relationships between these structural parameters are illustrated with measured values. The developed theoretical equation has been experimentally verified and considered to be applicable to other woven fabrics as well.
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Steam Press에 의한 毛織物의 치수變化에 관한 연구
智東宣 단국대학교 대학원 1987 學術論叢 Vol.11 No.-
As the experimental results of a continuing and repeating steam press by closing and opening press method in woven wool fabrics of Tropical, Twill, Gabardine, and Doeskin, the conclusions were as follows : In sewing process, after we took into consideration enough to the essence of press and the properties of materials, we justified in selecting of sewing machine, needle, hook, bobbin, sewing thread, the other accessaries, and so on. Especially in woven wool fabrics, it is desirable for us to begin sewing after we obtained previously a necessary information from weaving compaines and examined it thoroughly.
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지동선,윤철수 단국대학교 2001 산업기술연구 Vol.2 No.-
Siloxylated polypropylene fibers using two polymers of polypropylene and aluminosiloxane were prepared by melt blending. The effects of blending ratio on the thermal behaviors and tensile properties of siloxylated polypropylene fibers were study. The thermal behaviors, X-ray diffraction, and tensile properties of siloxylated polypropylene fibers were investigated be DSC, X-ray, and UTM analyses. It was found that the melting temperature of siloxylated polypropylene blend were not changes with increasing the aluminosiloxane contents. But heat of fusion of siloxylated polypropylene blend were decreased with aluminosiloxane contents. In addition, the peak intensity of siloxylated polypropylene blend in X-ray diffraction pattern was decreased with increasing the aluminosiloxane contents. After these blends were prepared as a fiber, ones tensile properties were measured. The tensile strength and the tensile modulus were decreased with increasing the contents of aluminosiloxane in the siloxylated polypropylene fibers. Also, the elongation at break was increased with increasing the contents of aluminosiloxane in the siloxylated polypropylene fibers. From these results, in case of introducing aluminosiloxane to polypropylene, the miscibility of polypropylene was improved.
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智東宣 단국대학교 1992 論文集 Vol.26 No.-
One factor influencing the comfort of fabrics for clothing is their resistance to the passage of water vapor. In this evaluation on the water vapor permeability of woven fabrics by response surface analysis, the water vapor transfer resistance of woven fabrics is a dependent variable, and three parameters of fabrics(i.e. thickness, porosity, and open free area) are simultaneously independent variables. The second order regression model on the water vapor transfer resistance(R_F) can be fitted from the method of least squares by response surface analysis. And the estimated value of water vapor transfer resistance of worsted fabrics made of ring spun yarns was approximately 0.82cm at the stationary point.
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앙고라 토모섬유의 방적성 개선에 관한 연구(I) - HCOOH/$H_2O_2$에 의한 표면처리 -
지동선,한정련 한국섬유공학회 1997 한국섬유공학회지 Vol.34 No.11
The effects of surface treatment carried out to improve the spinnability and anti-static property of angora rabbit fibers were studied. Angora rabbit fibers were treated with a mixture of 0.5%(wt%) formic acid and 1.5%(wt%) hydrogen peroxide (1:1 v/v) for 60, 80 or 100 minutes at 40, 60 or 80 $^{\circ}C$. The effects of treatment time and temperature on the surface structure, tenacity, elongation, tensile modulus and surface resistance were investigated. Scales of the cuticle layer were effectively raised without lowering the tenacity when treated for 80 minutes that of the untreated. The tenacity and the tensile modulus decreased slightly with the increase of treatment time and temperature, while the elongation and the surface resistance increased markedly. It should be noted that the influence of treatment temperature on the decrease in surface resistance of the treated fibers is more significant than that of treatment time.
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