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RISS 인기검색어
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- 저자 : Bae Seoung-youl (검색결과 2 건)
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이호태,임진남,배성열 한국화학공학회 1983 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.21 No.4
에스테르化 反應을 同伴하는 Formic acid-Methanol, Formic acid-Ethanol系에 대한 氣液平衡 data를 개량된 Othmer 平衡裝置를 使用하여 大氣壓下에서 실측하였다. 측정된 data를 氣液平衡比와 溫度로 상관지었고 그 기울기를 蒸發潛熱로부터 計算한 값과 비교하였다. Formic acid에 대한 活動度係數는 측정된 data와 氣相에서의 會合을 나타내는 이량체화 평형정수로부터 구하였고 Formic acid를 제외한 成分의 活動度係數는 氣相을 理想氣體로 간주하여 구하였다. Vapor-liquid equilibri of formic acid-methanol and formic acid-ethanol systems which are accompanied with esterification reaction were measured at atmospheric pressure. The relation of vapor-liquid equilibrium ratio(y_i/x_i) and temperature were obtained from the measured data. The activity coefficients of formic acid were calculated from the measured data and the dimerization equilibrium constant, taking into account association of vapor phase. For the other components, the activity coefficients were calculated by regarding vapor phase as an ideal gas, and the gradients of the activity coefficients vs. 1/T were about zero. Accordingly, the gradients of vapor liquid equilibrium ratio vs. temperature were compared with the values calculated from the molal latent heat of vaporization, and the values were found to be in good agreement. As a result, isobaric vapor-liquid equilibrium accompanied with reaction could be correlated with molal latent heat of vaporization.
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A study on manufacturing CFRP rebar with a high tensile strength
Kim Nam-il,Kwon Do-young,Burenkhangai Darkhijav,Lee Kyo-moon,Bae Seoung-youl,추용식 한국세라믹학회 2023 한국세라믹학회지 Vol.60 No.3
In this study, high-strength CFRP using carbon fiber as the main rebar and glass fi ber for the rib was developed. For pro- duction of CFRP, physical properties of various types of fibers were examined through optical microscopy, XRD analysis, and a tensile strength test. In addition, to verify the behavior according to the carbon fi ber and the type of resin, a carbon composite was fabricated with varied fi ber content and curing temperature. The physical properties of the fabricated carbon composite were measured using tensile strength and fracture shape tests. A high-strength CFRP rebar was manufactured using the pultrusion method and its mechanical properties, specifi cally tensile strength and elastic modulus, were measured. The CFRP rebar developed in this study showed relatively higher tensile strength and elastic modulus than the existing CFRP rebars, and it appeared that the developed CFRP rebar had a relatively smaller amount of pores than existing CFRP rebars.The CFRP rebar developed in this study showed relatively higher tensile strength and elastic modulus than the existing CFRP rebars, and it appeared that the developed CFRP rebar had a relatively smaller amount of pores than existing CFRP rebars.
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