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홍인권,김원일,이승범 한국고무학회 2000 엘라스토머 및 콤포지트 Vol.35 No.4
The experimental kinetics was analyzed for commercial rubbers such as NR, IR, BR, SBR 1500, and SBR 1700. Kinetic analysis for the commercial rubbers was performed using a thermogravimetric method, which the activation energies of NR obtained by Kissinger, Friedman, and Ozawa's method were 195.0, 198.3, and 186.3 kJ/㏖, respectively, whereas that of SBR 1500 were 246.4, 247.5, and 254.8 kJ/㏖, respectively. It was shown that the yield of pyrolytic oil was generally increased with increasing the final temperature. Considering the effect of heating rate, it was found that the yield of pyrolytic oil was not consistent for each sample. The number average molecular weight of pyrolitic oil of SBR 1500 was in the range of 740-2486. The calorific value of SBR 1500 was 39-40 kJ/g, and it might be a considerable energy potential although it was lower than the conventional fuel such as kerosene, diesel, light fuel, and heavy fuel.
Microcellular foaming of silicone rubber with supercritical carbon dioxide
홍인권,이상묵 한국화학공학회 2014 Korean Journal of Chemical Engineering Vol.31 No.1
In spite of great concern on the industrial application of microcellular silicone rubber foams, such as in electric and medical devices, only a few works can be found about the foaming of silicone rubber. In this study, microcellular silicone rubber foams with a cell size of 12 μm were successfully prepared with curing by heat and foaming by supercritical CO2 as a green blowing agent. The microcellular silicone rubber foams exhibited a well-defined cell structure and a uniform cell size distribution. The crosslinking and foaming of silicone rubber was carried out separately. After foaming, the silicone rubber foam was cross-linked again to stabilize the foam structure and further improve its mechanical properties. Foaming process of cross-linked silicone rubber should be designed carefully based on the viscoelastic properties because of its elastic volume recovery in the atmosphere. The basic crosslinking condition for small cell size and high cell density was obtained after investigating the rheological behavior during crosslinking.
Optimization of barrel plating process for electroless Ni–P plating
홍인권,이승범,김형진 한국공업화학회 2014 Journal of Industrial and Engineering Chemistry Vol.20 No.5
A plating test was carried out with changes in the concentration of nickel sulfate (NiSO4) and sodium hypophosphite (NaH2PO2) to analyze the plating characteristics depending on the balance of the electroless Ni–P plating solution. The coating thickness increased with the concentrations of NiSO4 and NaH2PO2. The optimum concentrations for electroless Ni–P plating were 27.0 g/L for NiSO4, and 24.0 g/L for NaH2PO2. The coating thickness was thicker at up to pH 4, but it was thinner after that. The deviations in the coating thickness decreased at up to pH 4, but it was increased after that. So the optimum pH of the plating solution was 4. Barrel plating was carried out while varying the open pore ratio, barrel rotation speed, plating temperature, and plating time, which revealed that the coating thickness was increased with the open pore ratio and barrel rotation speed. Therefore, the optimum open pore ratio and barrel rotation speed in electroless Ni–P plating were 22.5% and 2.5 rpm, respectively.
Pulse 형태로 조사된 초음파 활성화에너지에 의한 Polystyrene 라텍스 중합 특성
홍인권,윤용수,김형진,이승범,김원일 한국공업화학회 1997 응용화학 Vol.1 No.2
There are many methods to syntesize polystyrene latex. Emulsion polymerization is often used commercially, but initiator has the disadvantage for environmental pollution. The free radical is produced by ultrasound energy effect, polystyrene latex was synthesized using ultrasound energy instead of chemical initiator. As the ultrasonic irradiation time increased, average molecular weight increased and polydispersity decreased. And as the concentration of SDS increased, degree of polymerization increased and maximum value of degree of polymerization was shown when the concentration of SDS was 2 wt%, and reaction temperature was 40℃. During the polymerization, increase and decrease of molecular weight was repeated and molecular weight controlled monodisperse type polystyrene latex was synthesized by controlling of ultrasonic irradiation time and the concentration of SDS.
Alcoholysis of canola oil using a short-chain (C1–C3) alcohols
홍인권,이승범,김형진,박정우 한국공업화학회 2014 Journal of Industrial and Engineering Chemistry Vol.20 No.5
In this study, the conversion characteristics and fuel properties of biodiesel were investigated according to carbon numbers of the short-chain alcohols that were used as reactants in the biodiesel manufacturing process. As the carbon numbers of the short chain alcohols increased, the fatty acid alkyl ester content of biodiesel decreased, and the optimum reaction temperature and time increased. The optimal conditions for short-chain alcoholysis were as follows: methanolysis (55 ℃, 60 min), ethanolysis (65 ℃, 80 min), and propanolysis (85 ℃, 100 min). Also, according to the fuel properties analysis of the manufactured biodiesel with increasing carbon numbers, the heating value increased to 39.6–41.1 MJ/kg, and oxidation stability improved with methanolysis (6.68 h), ethanolysis (7.03 h), and propanolysis (7.51 h). But the kinematic viscosity increased from 4.24 to 4.68 cSt with increasing carbon numbers of the short chain alcohols.
Prediction of biodiesel fuel properties from fatty acid alkyl ester
홍인권,전길송,이승범 한국공업화학회 2014 Journal of Industrial and Engineering Chemistry Vol.20 No.4
In this study, the fatty acid alkyl esters composing the basic molecular structures of biodiesels were used to predict the characteristics of biodiesel fuels. The characteristics of biodiesel fuels (higher heating value, oxidation stability, and kinematic viscosity) made using vegetable oils and animal fats were predicted by analyzing the characteristics of various fatty acid alkyl esters. The average absolute error range of the higher heating values was from 0.14% to 1.42% based on the analysis of the fatty acid alkyl ester compositions of the biodiesels. And the average absolute errors of oxidation stability and the kinematic viscosity ranged from 0.4% to 7.5% and from 0.2% to 4.3%, respectively. Thus, various biodiesels fuel properties, different fatty acid composition, can be predicted from fatty acid alkyl esters fuel properties.
초음파에너지가 도입된 유화중합공정에서 Polystyrene Latex 의 분산도 및 입자분포 특성
홍인권,김원일 한국고무학회 1998 엘라스토머 및 콤포지트 Vol.33 No.2
A new technology was introduced to the emulsion polymerization. It is the ultrasonic activation method which replaced a chemical initiator and the environmentally benign process. In this study, free radicals were produced by a pulse type ultrasound energy irradiation, then polystyrene latex was polymerized without chemical initiator. With ultrasonic energy density, the degree of polymerization, average molecular weight, and particle size were increased, but the polydispersity index for the molecular weight and the particle size were decreased. The optimum condition of emulsifier concentration and temperature was found to be 1.0 wt.% SDS and 40℃, respectively. As a result, the emulsion polymerization process without chemical initiator was proved to be comparable to common latex properties such as average molecular weight, molecular weight distribution, particle size, etc.