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용융블렌드를 이용한 PLA/PEG 블록 공중합체의 제조
윤철수,지동선,Yoon, Cheol-Soo,Ji, Dong-Sun 한국섬유공학회 2006 한국섬유공학회지 Vol.43 No.5
PLA/PEG blends composed of poly(lactic acid) (PLA) and poly (ethylene glycol) (PEG) were prepared via melt blending for bioabsorbable filament sutures. The effects of blend composition and blending time on the alcoholysis or esterification in the PLA/PEG blends were investigated. Their properties due to PLA/PEG block copolymer were characterized by $^1$H-NMR, GPC, and DSC analyses. Consequently, PLA/PEG block copolymers were formed during the melt blending by alcoholysis or esterification from a new peak due to -CH$_2$(c') appeared at 4.3 ppm. In addition, the molecular weights of the blends processed in Haake Rheomix for 10$\sim$30 minutes at 220 $^{\circ}C$ under screw speed 20 rpm decreased with increasing PEG contents and blending time. Their thermal properties such as melting temperature and heat of fusion due to PLA in the blends decreased with increasing PEG contents and blending time. However, their melting temperature and heat of fusion due to PEG increased with an increase of PEG content under constant blending time.
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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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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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