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전기화학적 방법으로 합성한 전도성 Poly(acrylonitrile)/Poly(pyrrole) 복합체의 전기화학적 성질
박연흠,한명희 한국섬유공학회 1995 한국섬유공학회지 Vol.32 No.6
The electrochemical properties of poly(acrylonitrile)(PAN)/poly(pyrrolexppy) composites prepared by electrochemical polymerization of pyrrole in an insulating PAN matrix were studied. PAN/PPy composite film on platinum electrode could be repeatedly driven between the conductinal and insulating state. Cyclic voltam-movams(CVs) showed that the redox reaction of PAN/PPy composite was not electrochemically reversible and dependent on the nature of the electrolyte used. CVs also showed that the Vonh rate of PPy in PAN matrix was influenced by the polymerization conditions such as the type and the concentration of the electrolyte. The relationship between anodic peak current and scan rate during the potentialcycling indicated that the redox reaction of PAN/PPy composite on platinum electrode was dialsion-controlled reaction.
전도성 Poly(carbonate)/poly(pyrrole) 복합체의 제조 및 전기적 성질
박연흠,오효승 한국섬유공학회 1994 한국섬유공학회지 Vol.31 No.10
Electrically conducting Poly(carbonate) (PC)/poly(pyrrole) (PPy) composite films were synthesized by exposing PC films containing ferric chloride as an oxidant to pyrrole vapour under various polymerization conditions. and their electrical conductivity and morphology were studied. After pyrrole was polymerized in PC matrix for two hours, the composite films showed the conductivity as high as 10-4~10-3S/cm and it increased with the concentration of the oxidant and the polymerization time and decreased with the polymerization temperature. Threshold conductivity was observed when the content of PPy in PC/PPy composite film was ca. 4.5~5 weight percent. The formation of PPy in PC matrix was confirmed by FT-IR spectra anal scanning electron micro-graphs. The x-ray diffraction curves indicated that talc structure or Pc/PPy composite film was amorphous. The conductivity increased one order of magnitude by mechanical stretching.
박연흠,고성욱,김영준 한국섬유공학회 2000 한국섬유공학회지 Vol.37 No.12
Functional polyurea microcapsules were prepared by the conventional interfacial addition polymerization utilizaing 2,4-toluenediisocyanate dimer. The inner-blockedisocyanate(isocyanate dimer) can be used to prepare microcapsules having latent functionality that can be cleaved at high temperature to generate isocyanate functional groups. The particle size of the microcapsules obtained was a function of the agitation speed and the concentration of surfactants. Average particle diameters were in the range of 10 to 30 ${\mu}{\textrm}{m}$. The oil-containing polyurea microcapsules of which average particle size of 10${\mu}{\textrm}{m}$ were obtained at 4000 rpm and 3% surfactant concentration. Both the DSC thermogram and FTIR spectroscopic data showed that the uretdione ring was opened and then blocked isocyanates were reactivated at an elevated temperature of 25$0^{\circ}C$.
N-octadecylacrylamide LB 필름의 제조와 UV 조사에 의한 광중합
박연흠,고춘원,김영준 한국섬유공학회 1999 한국섬유공학회지 Vol.36 No.4
Amphiphilic monomer, N-octadecylacrylamide (N-ODA), having a long chain hydrophobic alkyl group and a hydrophilic amide group was synthesized from the reaction of acrylamide with 1-bromooctadecane in dimethylformamide (DMF) in the presence of KOH at room temperature for three hours. N-ODA monolayer was deposited on solid substrates, such as slide glass, KRS-5, and silicon wafer, by employing Langmuir-Blodgett (LB) technique, under the appropriate deposition condition. Complete polymerization of monomer LB films was achieved by UV-irradiation for 220 seconds. The polymerized LB films were not soluble in ethanol that is a good solvent for monomer LB films. Negative resist patterns were generated by irradiation of the masked N-ODA monomer LB films with UV light followed by dissolution of the unirradiated portions with ethanol.
박연흠,백남중,김영준 한국섬유공학회 2001 한국섬유공학회지 Vol.38 No.11
Melamine-formaldehyde microcapsules were prepared by conventional interfacial addition polymerization and characterized by Fourier transform(FTIR) spectroscopy, particle size analyzer, and scanning electron microscopy. The effects of polymerization variables such as the nature and concentration of surfactants, agitation speed, and agitation time on the particle size and particle size distribution were investigated. FTIR spectroscopic data shoed that perfume oil was successfully encapsulated in the microcapsule. The nature of surfactants had profound effects on the particle size and particle size distribution. It was also found that the use of poly(vinyl alcohol) was critically important to prevent agglomeration of microcapsule particles.
박연흠,김정기 한국섬유공학회 1993 한국섬유공학회지 Vol.30 No.10
The modified nylon 6/polypyrrole composite films were Prepared by exposing modified nylon 6matrix films containing cupric chloride to pyrrole vapor under various experimental conditions. The electrical conductivity and stability on ambient air exposure. thermal and mechanical properites of composite films were investigated. The results showed that the conductivity increased from 10% to 10-3 S/cm on exposing the matrix film containing 10 wt% cupric chloride to pyrrole vapor for 30 min at $25^{\circ}C$. The saturation conductivity increased up to 102 S/cm when the same sample film was exposed to pyrrole vapor for 1 hr at $0^{\circ}C$. The conductivity increase of composite aims prepared at low temperature was related to its morphology. The stability of conductivity was excellent: the conductivity has decreased within one order of magnitude on exposure to ambient air for 30 days. The thermal weight loss and the breaking strength loss of composite film were higher compared to the matrix films. especially when the composite film was prepared with the matrix film containing larger content of cupric chloride.
박연흠,김노수 한국섬유공학회 1972 한국섬유공학회지 Vol.9 No.1
The effect of carbon-arc radiation on the breaking strength of some kinds of synthetic fibres (PVA, PVC, AN-VDC, PVC-VDC, PVC-AN) was studied. The results were as follows; 1. Polyvinylalcohol fibre is the severest of synthetic fibres in the strength loss. 2. The strength loss is proportional to the square root of exposure hour.