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Diarylethene계 광변색성 색소의 합성 및 그의 특성
최창남,류희석,박형인,김종배,김상률 한국섬유공학회 1999 한국섬유공학회지 Vol.36 No.2
In order to investigate the effect of connector structure of diarylethene derivatives on the maximum absorption band, thermal stability, and fatigue resistance to photoirradiation, the photochromic compounds, 1,2-dicyano-1,2-bis(2,3,5-trimethyl-4-thienyl) ethene(DYE I) and 2,3-bis(2,3,5-trimethyl-4-thienyl) maleic anhydride(DYE II) were synthesized. The DYE I has cyano groups and the DYE II has anhydride groups on the 1,2 carbon position as connector group, respectively. Identification of synthesized photochromic dyes were performed with $^1H-NMR$ and FT-IR spectrophotometers. The properties of photochromic compounds synthesized were examined in toluene solution and dispersed in polystyrene film. Upon the introduction of cyclic structure to the connector group, the maximum absorption band $({\lambda}_{max})$ shifted to longer wavelength, and the thermal stability and fatigue resistance increased. It is reasoned that the change of an electron-accepting ability at the 1,2 positions of aromatic rings or the variations of conjugation length affect the physical and chemical properties of the diarylethene derivatives. And the thermal stability and the fatigue resistance properties were rather enhanced dispersed in polymer film than in the solution state on account of less oxidation.
고무/폴리에스테르 복합재료의 접착성 및 내피로성에 관한 연구(I)
최창남,전한용 한국섬유공학회 1997 한국섬유공학회지 Vol.34 No.1
The adhesive properties and fatigue resistance of polyester cord in rubber matrix were investigated in terms of coating conditions and types of adhesive agents. The polyester cord was coated with diisocyanate adhesive agent and then resorcinol-formaldehyde latex(RFL). Two types of diisocyanate adhesive agent were used. One is made from hexamethylene diisocyanate (aliphatic type), and the other is made from m-xylene diisocyanate (aromatic type). The adhesive properties were measured by the Pull-Out method, and evaluated with regard to the energy of adhesion and the maximum load. The fatigue resistance was checked by disc fatigue tester. The adhesive properties of polyeser to rubber matrix were affected by the types of diisocyanate adhesive agent used. Namely, the energy of adhesion was higher in aliphatic type and the maximum load was higher in aromatic type. The fatigue resistance was also affected by the adhesive properties, especially the energy of adhesion rather than the maximum load. We concluded that while the energy of adhesion was kept high, the repeated stress and strain were distributed well all over the fiber resulting the good fatigue resistance.
고분자간 복합체를 이용한 합성섬유 표면의 개질(II) -PMA/P4VP 복합체의 흡습성과 PET 표면개질에의 응용-
최창남,박종백 한국섬유공학회 1989 한국섬유공학회지 Vol.26 No.5
The water vapor sorption properties of PMA/P4VP Complex were examined. The amount of water vapor absorbed by PMA/P4VP Complex was higher than that by the pure components, especially in the low and middle relative humidity regions. This means that the polarization due to polyion complex formation has a positive effect on its sorption property. With the good dye susceptibility and hygroscopicity of PMA/P4VP Complex, we attempted to modify the surface of PET film by in-situ reaction of PMA and P4VP grafted PET film in methanol. The PMA/P4VP Complexed PET showed higher dyeability and hygroscopicity, but worse anti-electtostatic property than P4VP grafted PET.
고분자간 복합체를 이용한 합성섬유 표면의 개질(I) -PMA/P4VP 복합체의 구조와 염료에 대한 결합성-
최창남,문태식 한국섬유공학회 1989 한국섬유공학회지 Vol.26 No.2
A polyion complex was formed by mixing poly(methacrylic acid) (PMA) and poly(4-vinylpyridine) (P4VP) in methanol. Its structure and composition were examined by means of infrared spectroscopy(IR) and elemental analysis. Excess of PMA in the product was observed when concentrated solution were used or when an excess of PMA was added to P4VP. The binding of methyl orange and its homologs by PMA/P4VP complex was examined at 20-4$0^{\circ}C$ temperature range. The first binding constants and the thermodynamic parameters in the course of binding were calculated. It was found that the free energy and the enthalpy changes are negative and the entropy change is positive. The longer the alkyl chain of the dyes is the larger the entropy change is. The negative values of$\Delta$G increase with increasing temperature. These characteristics of the thermodynamic parameters suggest that hydrophobic interaction between dye and complex plays an important role in binding. In relation to this hydrophobic interaction, the effects of urea and KCl on the binding of methyl orange were also investigated.
에틸렌글리콜과 테레프탈산의 용해도 및 에스테르화 속도(II)-TPA 입자크기의 영향과 용해 기구-
최창남,양갑승 한국섬유공학회 1994 한국섬유공학회지 Vol.31 No.7
In the esterification step of PET formation, we Investigated the effect of TPA particle sizes on the solubility and reactivity of TPA in EG to illuminate the mechanism of dissolution. The solubility was estimated by clear time and turbidity. The reactivity of TPA was determined by acid and saponification values. As the particle size of TPA decreased, both enhanced reactivity and solubility were introduced. The results suggest that small portion of TPA in EC is dissolved %rst the proton farmed in EG plays the role of an acid catalyst, then, the ester formed accelerates the dissolution and esterification of TPA.
Polyacrylonitrile의 개질에 관한 연구(VI) -Acrylonitrile과 N-methacryloyl-DL-$\alpha$-valine의 공중합체에 관하여-
최창남,홍성일 한국섬유공학회 1983 한국섬유공학회지 Vol.20 No.5
Acrylonitrile (An) was copolymerized with N-methacryloyl-DL-$\alpha$-valine (MAV) in order to increase moisture regain and impart an affinity for acid dyes. MAV was prepared by Schotten-Baumann reaction of DL-$\alpha$-valine with methacryloyl chloride. The identification of MAV was conformed by IR spectrum, melting point and elemental analysis. Monomer reactivity ratios were calculated and inherent viscosity, tensile strength, moisture regain, dye absorption for acid dye, and decomposition temperatures of copolymers were investigated. The moisture regain, dye absorption for acid dye, inherent viscosity were investigated. The moisture regain, dye absorption for acid dye, inherent viscosity were increased, but tensile strength, decomposition temperature were decreased in proportion to the mole % of MAV.
최창남,윤보선 한국섬유공학회 1994 한국섬유공학회지 Vol.31 No.4
S-cyanoethylated wool keratin(SCEK) was prepared by the reaction with the reduced wool fiber and acrylonitrile at pH 9.5 and pH 8.0. It was found that SCEK prepared at pH 9.5 was cyanoethylated more than that prepared at pH 8.0 from the results analyzed by FT-lR spectrometry and DSC. The transport phenomena of solutes(urea, creatinine. tryptophane. and glucose) through SCEK membranes were investigated in the temperature range of 20~4$0^{\circ}C$. Permeability dependence on solute size through the SCEK membranes decreased as molecular size increased. And that of SCEK prepared at pH 8.0 was more permeable than SCEK prepared at pH 9.5. Permeability of the similar molecules was depended more as molecular weight decreased. The effect of temperature of SCEK prepared at pH 8.0 was higher than that prepared at pH 9.5. The membrane prepared at pH 5.0 is mainly controlled by the solution-diffusion perkleatiot mechanism and that prepared at pH 9.5 is mainly controlled by the pore-type permeation mechanism. The above explanation was based upon the facts that the membrane prepared at pH 8.0 showed more temperature dependence and non-proportional relationship between the molecular weight and the permeability comparing with the membrane prepared at pH 9.5.