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연신온도가 폴리에틸렌 테레프탈레이트 필라멘트사의 인장특성에 미치는 영향
박연흠,원성연 成均館大學校 科學技術硏究所 1990 論文集 Vol.41 No.2
The tensile properties of poly(ethylene terephthalate) filament yarn have been investigated by varying the drawing temperature under the constant draw ratio of 3.0. The breaking strength and elongation increases with the drawing temperature upto 85℃, but above 85℃ they decrease with the drawing temperature. The yield stress and yield strain have also shown the similar trends. The density increases with the drawing temperature upto 85℃, but above 85℃ the density of 1.38g/㎤ has been maintained. Thus it is suggested that the optimum drawing temperature of poly(ethylene terephthalate) filament yarn is around 85℃ under the draw ratio of 3.0.
Langmuir-Blodgett법을 이용한 전도성 Arachidic acid/Polypyrrole 복합체 박막의 제조와 특성분석
박연흠,박성윤,박장혁 成均館大學校 科學技術硏究所 1995 論文集 Vol.46 No.2
The electroconductive arachidic acid/ polypyrrole composite films have been synthesized by exposing the arachidic acid Langmuir-Blodgett(LB) film contaning ferric chloride to pyrrole vapour. The spreading behavior of ferric arachidate on the subphase with different pH values has been studied by investigating the surface pressure-area isotherm, and the transfer ratio. The formation of polypyrrole in the matrix LB film can be confirmed by FT-IR spectra and scanning electron micrographs. The composite LB films prepared at 0℃ showed the more uniform morphology and the higher electroconductivity.
Cellulose Acetate/Polypyrrole 複合體의 電氣化學的 性質
박연흠,전유종,한명희 成均館大學校 科學技術硏究所 1994 論文集 Vol.45 No.1
Electrically conducting cellulose acetate (CA )/poly( pyrrole) (PPy) composites were prepared by eletrochemical polymerization of pyrrole in an insulating CA matrix and their electrochemical properties were studied. CA/PPy composite film on platinum electrode could be repeatedly driven between the conducting and insulating state. Cyclic voltammograms (CVs) showed that the redox reaction of CA/PPy composite was not electrochemically reversible and dependent on the nature of the polymerization conditions such as the type and concentration of the electrolyte, thickness of CA matrix film and polymerization temperature. The relationship between anodic peak current and scan rate during potential-cycling indicated that the redox reaction of CA/ PPy composite on platinum electrode was diffusion-controlled reaction.