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박병기 全北大學校 1985 論文集 Vol.27 No.-
In the light of the properties of colloids in the surface of disperse phase and dispersion, there exist specific characters such as adsorption or electric double layer, which seems to play important roles in determining the physiochemical properties in the dyeing system. The present study was aimed to clarify the electrokinetic phenomena of dyeing through the role of electric double layer by ion in silk fiber with different ionic effects under different condition. Spectrophotometric analysis method was used to compare dyeing condition of surface, which can be detected by electrokinetic phenomena and the inner of fiber after decoloration of dyed silk fiber. Silk, the typical amphoteric fiber was dyed with monoazo dyes such as C.I. Acid orange 20, and C.I. Acid Orange 10. Various combinations were prepared by combining pH, temperature and dye concentration, in order to generate streaming electric potential which were measured by microvolt-meter and specific conductivity meter. The results were transformed to zeta potential by Helmholtz-Smoluchowski formular and to surface electric charge density by Suzawa formular, surface dye amount, and effective surface area of fiber. The degree of swelling, the amount of end group and the amount of dyes of inner fiber was also measured by the swelling method, the end point analysis method and Lambert-Beer's law. The results obtained are as follows. 1. The zeta potential was proportional to the amounts of dye adsorbed on silk fiber and the negative zeta potential increased with the amounts of dye adsorbed. This result was explained on the basis that the dye anions with their negative charge makes salts with NH_3^+ groups of silk fiber. 2. The isoelectric points of fibroin and sericin were different. 3. The degree of swelling of silk was closely related to zeta potential and the negative charge of heat treated silk increased in accordance with the rising temperature to 150℃, but it indicated that increase of adsorption interfaces by loose of micell above 175℃. 4. The amounts of surface dye adsorption decreased with rising temperature but the total dye adsorption was vi-sa-vis. 5. The effective surface area of silk fiber for acid dyeing was about 1.1×10^7㎠/g-fiber.
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C. I. Reactive Red 2에 依한 絹織物 染色
朴炳基 全北大學校 1979 論文集 Vol.21 No.-
Work on the application of dichlorotriazine reactive dye to silk fabric was discussed. Since the introduction of dichlorotriazinyl dyes in 1956, the application of reactive dyes to cellulose has become very widely used. Several years befor the appearance of reactive dyes for cellulose, Remalan dyes has introduced for protein fibers, but although they contained reactive groups they were classified as Acid dyes, and after they transferred to Reactive dyes. Reactive dyes are also applied wool and silk, but they have different mechanism from those used in cllulosic fibers. This dichlorotriazine-reactive dye(Procion Red Mx-5B) exhibits the critical fixation for silk at pH 7, and it appears to me that maximum exhaustion conditions are : Glauber's salt 25g/l, Sodium carbonate 2.0g/l, Matexil DN 0.5%(o.w.f), Temp 40℃, treating time 40min.
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申鍾學,河基柱,朴秉基 慶一大學校 1997 論文集 Vol.14 No.2
In this experimental study, thirty-six specimens were constructed and tested to determine bond stress-slip characteristics of reinforcing bar embedded in concrete. Considering actual bond stress-slip relationships in the interface between reinforcing bar and concrete allows for a realistic prediction of cracking. Based on the test observations and the analysis of the test data, the following conclusions are made. (1) Bond stress-slip relationships were found in variance with concrete strength, concrete cover, bar diameter, and bond length, which were very important factors to evaluate the bond characteristics. (2) In this experimental program each specimen were showed the splitting failure, pull-out failure, and bond yielding failure mode due to the combination of design factors through this experimental program. For the high-strength concrete, test specimens, used in small size diameter(D13), were showed in splitting failure with impact sound. And it was also found that the failure mode were difference in the bar diameter. (3) in the same case of concrete strength concrete, it was found that the maximum bond stress was deeply influence in embedded bond length. (4) Maximum bond stress from test results was very higher than values by ACI 318-89 Code. Therefore, ACI 318-89 Code for the bond design was very satisfactory in reinforced concrete structures. It was thought that the optimal formulas of maximum bond stress should be proposed for the optimal design.
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박병기,한태희,정용식,Park Pyong-Ki,Han Tae-Hui,Chung Yong-Sik 한국섬유공학회 2006 한국섬유공학회지 Vol.43 No.2
The Hanji treated with citric acid as crosslinking agent was prepared to improve wet dimensional stability and wet-strength. To improve dyeability for direct and reactive dyes, various concentrations of chitosan were added in crosslinking process. The wet dimensional stability and wet-strength of crosslinked Hanji were improved by citric acid addition, whereas the folding endurance significantly decreased. As the concentration of citric acid increased, K/S values of the crosslinked Hanji for berberin increased, but those direct and reactive dyes decreased. However, the dye adsorption for direct dye and reactive dye were improved by chitosan addition.
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박병기,이방원,김환철,김학용,협전등미사 한국섬유공학회 1998 한국섬유공학회지 Vol.35 No.8
Polyester fabrics were treated with chitosan of various molecular weights and crosslinking agents by the pad-dry-cure method. Chitosan solutions were prepared using acetic acid as a solvent, and the concentration of solution were in the range of 0.l~l%. The properties of the fabrics treated with the chitosan solution, including tensile strength, drape stiffness, reduction rate, and half life, were measured. The strength of the polyester fabrics was observed to decrease greatly by the alkali-treatment, but was recovered by the chitosan treatments. One of the properties obtained with the chitosan treatment was the remarkable antistaticity.
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