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RISS 인기검색어
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- 저자 : 이양헌(Yang-heon Lee) (검색결과 6 건)
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N-Methylmorpholin N-Oxide를 이용한 면섬유 집합체의 용제접착 -면사의 의마(擬麻) 가공-
이양헌,박찬헌,Lee, Yang-Heon,Park, Chan-Heon 한국섬유공학회 1996 한국섬유공학회지 Vol.33 No.6
A cotton yarn was immersed in aqueous solution of N-methylmorpholin N-oxide(NMMO) with various concentrations, and dried at 9$0^{\circ}C$ for various periods of time under constant-length condition, and investigated in relation to an effect of linenlike finishing. The solvent bonding between fibers of sample yarn is achieved by NMMO solution, and its tendency is increased with concentration of the solution. The stiffness is therefore increased with the concentration, which produce linenlike effect on the cotton yam. The period of drying time has positive effects on the stiffness, but much less than the concentration of solution. The tensile strength is increased in similar tendency of stiffness, and elongation is decreased a little. The tensile behavior for the samples treated with the solutions of 30% or higher concentration presents the initial elastic region, and its modulus and yield strength are roughly increased a little with the concentration of solution. The moisture regain and dye uptake are roughly increased with the concentration because of the mecerization-like effect by swelling of fiber with the NMMO.
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합성섬유 필라멘트사의 새로운 텍스쳐 가공법: 용제-텍스쳐가공법 -포름산에 의한 나일론 6 필라멘트사의 용제-텍스쳐가공-
정해인,이양헌,Jeong, Hae-In,Lee, Yang-Heon 한국섬유공학회 1997 한국섬유공학회지 Vol.34 No.4
This study has been carried out to develop a new texturizing process for synthetic filament yarns by solvent - the Solvent-Texturizing. Nylon 6 filament yarn was treated with aqueous solution of formic acid. The creation of crimp was confirmed and the tensile properties and dyeability of treated yarns were examined. The possibility of the Solvent-Texturizing was confirmed. The shape and dimension of crimps were not uniform. The creation mechanism of crimp was confirmed through SEM photographs: The crimps were created by uneveness of width swelling and longitudinal shrinkage in a same cross-sectional area of a filament by the solvent. The crimp ratio was increased with treatment time and formic acid concentration. Especially, the increase of crimp ratio with treatment time was produced mostly by treatment for 1 sec. Remarkable shrinkage, small weight loss, consequent decrease of tensile strength retention, increase of elongation, and dye adsorption were produced by the Solvent-Texturizing under the conditions being used. Most of their changing tendencies were similar to that of the crimp ratio.
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용제처리에 의한 합성섬유의 구조와 물성에 관한 연구(I) -Formic Acid로 처리된 Nylon 6 Filament의 구조해석을 중심으로-
최석철,조현혹,이양헌,Choe, Seok-Cheol,Jo, Hyeon-Hok,Lee, Yang-Heon 한국섬유공학회 1983 한국섬유공학회지 Vol.20 No.6
일반적으로 섬유를 유기용제로 처리하면 그 배향도는 감소하고 결정화도는 증가하게 된다. 본 연구에서는 formic acid 수용액 중에서 처리된 nylon6 filament의 구조변화를 중심으로 고찰하였다. 또한 용제처리에 의한 물성저하의 원인이 되는 배향도의 감소를 방지하기 위한 방법을 찾아보기 위해 시료를 정장처리, 그리고 무긴장처리 후 수축분에 대해 원래 길이대로 재연신 해서 서로 비교검토해 보았다. 먼저 nylon섬유에 대한 용해능이 큰 formic acid 수용액 처리시에는 3$0^{\circ}C$에서 10분만에도 심한 배향도의 감소, 결정화도의 증가가 초래되었다. 정장처리를 했을때는 고분자쇄의 운동이 억제되었기 때문에 배향도의 감소는 적었으나 결정화도가 조금밖에 증가하지 못했다. 그리고 재연신해준 경우에는 결정화도는 대단히 많이 증가했지만, 재연신중에 구분자쇄의 완화가 완전히 일어나지 못하기 때문에 배향도의 회복 또한 완전하지 못해서 정장처리의 경우보다 배향도가 더 작게 나타났다. 여기서 만약 재연신중의 완전한 섬유구조완화방법만 찾을 수 있다면 이 무긴장 처리후의 재연신의 효과는 매우 커질 것이다. 그래서 이에 대한 계속적인 연구가 요망된다. When a fiber is treated with a organic solvent the orentation decreases and the crystallinity increases. In this study, it was attempted to investigate on the change of the fine structure of nylon 6 filaments which were treated in aqueous solutions of formic acid. And in order to search for the method to prevent the deterioration in physical properties by the restraint of decrease of orientation, the filaments were treated under the unrestrained and the constant length conditions and some of the filaments treated under the unrestrained condition were redrawn to the original length. And they were investigated in contrast with one another. The orientation of fiber decreased and the crystallinity of fiber increased very much even at 30$^{\circ}C$ for 10 minutes when the nylon 6 filaments were treated in aqueous solutions of formic acid under the unrestrained condition because of the high solubility of the nylon fiber for formic acid. Under the constant length condition, the decrease of orientation became much smaller but the crystallinity increased only a little because of the restraint of the activity of molecular chains, but on the redrawing the increase of crystallinity became much greater but the orientation recovered only a little because of the incomplete relaxation of fiber structure during the redrawing. If the method of complete relaxation of fiber structure during the redrawing can be searched out, the effect of the redrawing will become greater. So it's necessary to study about this problem continuously.
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Poly(ethylene Terephthalate) 섬유의 Amine 분해에 관한 연구 (I) -Amine 분해를 한 PET Filament의 미세구조 및 형태-
조현혹,최석철,이양헌,Jo, Hyeon-Hok,Choe, Seok-Cheol,Lee, Yang-Heon 한국섬유공학회 1984 한국섬유공학회지 Vol.21 No.2
Amine degradation of poly(ethylene terphthalate) (PET) is interesting subject as a model for in-use ageing problems and as a way to investigate morphology of fibers and films. In order to investigate the structure and morphology of two kinds of PET fibers, i.e. shaped and circular ones, PET fibers have been degraded in 50 and 60% aqueous ethylamine solutions at 30 ${\pm}$1$^{\circ}C$ for various time intervals. The changes of such properties as weight loss, crystallinity, crystallity size, and morphology were measured and observed on the insoluble fraction during amine degradation. The conclusions obtained from this study are as follows; 1. Weight loss, increase in crystallinity, and decrease in crystallite size were found to gradually increase with increased treatment time. 2. Initially ethylamine diffuses and permeates into PET fibers. in the second stage, decomposition and dissolution of PET fibers occurrs mainly in the amorphous regions. During the third stage, there is a gradual decrease in the reaction rate and this may the attributed to a relatively slow attack on crystalline regions in the sample. This indicates that amine degradation of PET fibers is a permeant reaction. 3. Stress crack occurred no fiber surfaces in proportion to reaction time with ethylamine solution, and finally this resulted in the breaking of PET fibers. 4. Change patterns of weight loss and crystallinity of PET fibers upon amine degradation were in accordance with those from the morphological study.
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