http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
다관능성 모노머의 존재 하에서 전자빔에 의해 가교된 폴릴프로필렌의 특성
한도흥,신승호,Petrov,Serguei,이정희 한국화학공학회 2001 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.39 No.3
3기능성 모노머인 트리메틸로프로판트리아크릴레이트(TMPTA)와 트리아릴 시아네이트(TAC)이 가교제로 첨가된 호모폴리프로필렌(homo-polypropylene: HPP)과 랜덤 터폴리프로필렌(random ter-polypropylene: RTPP)의 전자빔 조사는 비교적 높은 가교도를 보였다. 여기서 TMPTA가 첨가된 HPP와 RTPP의 최대 가교도는 5 kGy에서 각각 67%와 52%인 반면에, TAC가 첨가된 HPP의 가교도는 방사선량에 따라 연속적으로 증가하여서 240kGy에서 65%에 도달하였다. 젤함량, 용융지수, 팽윤율, 평균분자량 분포와 같은 여러 실험 데이터로부터, TAC가 첨가된 HPP와 TMPTA가 첨가된 RTPP는 TWPTA가 첨가된 HPP 보다 높은 조사선량에서 훨씬 높은 방사안정성이 있음을 밝혔다. 용융열 데이터로부터 방사가교는 조사된 폴리프로필렌에서 결정도 변화에 거의 영향을 주지 않으며 가교는 결정영역과 무정형영역의 경계면에서 주로 일어남을 보였다. 2mmol%이상의 TMPTA가 첨가된 HPP는 과량의 모노머에 의한 자체의 호모중합 때문에 가교 되기가 어려웠다. Electrons-irradiated homo-polypropylene(HPP) and random ter-polymer of propylene(RTPP), in which trifunctional monomers such as trimethylopropanetriacrylate(TMPTA) or triallylcyanuate(TAC) was added as crosslinking agent, showed comparably high degree of crosslinking: wherein the maximum degree of crosslinking was 67% and 52% around at 5 kGy for HPP and for RTPP, respectively, both added with TMPTA, whereas the degree of crosslinking in HPP with TAC continuously increased with radiation dosages, reaching to 65% at 240 kGy. From several experimental data such as, gel content, melt index, swelling ratio, and average molecular weight distribution, HPP with TAC and RTPP with TMPTA were found out to be much higher radiation-stable than HPP with TMPTA, especially at high dosages. The heat of fusion data could show that radiation crosslinking hardly gave an effect on changing of crystallinity in the irradiated polypropylene and could occur mainly at boundaries between crystalline and amorphous phases. It was found that HPP added with more than 2 mmol% of TMPTA were difficult to be highly crosslinked probably due to a homopolymerization by an excess of this monomer.
한도흥 嶺南大學校 工業技術硏究所 1989 연구보고 Vol.17 No.2
Numerical examples show that clock wise hysteresis loop can exist in the hydrogenation of ethylene over pt catalyst when one molecule of ethylene is chemisorbed on one atom of platinium, but rate multiplicity cannot be found when one molecule of ethylene is chemisorbed associatively on two atoms of platinium. Also numerical analysis shows that rate multiplicity can exist in the case of associative adsorption of ethylene on the two site of platinium by considering hydrogen spillover to support.
금속담지촉매상의 에틸렌의 수소화반응에서 속도다중성에 대한 연구
한도흥 嶺南大學校 工業技術硏究所 1989 연구보고 Vol.17 No.2
Ethylene hydrogenation experiments were carried out respectively over 0.01wt.% pt/?? -Al₂O₃and 0.05wt.% pt/α-Al₂O₃ catalysts and rate multiplicity including ignition and extinction points was found. Over 0.01 wt.% pt/?? -Al₂O₃catalyst, the width of rate-concentration hysteresis loop increased with hydrogen concentration, but above some hydrogen concentration the extinction point abruptly increased and existed at very high ethulene concentratoin. Over 0.05wt.% pt/α-Al₂O₃, extinction points were found on the decreasing path of ethylene concentration but ignition points could not be found on any path. The difference between feed temperature and catalyst layer temperature is small at a narrow width and much large at a very wide width. This result suggests that the multiplicity in ethylene hydrogenation may be caused by the coupling effect of kinetic and heat transfer limitation.
반경흐름 고정층 반응기의 해석 : Ⅰ.내경에 대한 외경의 비의 영향 Ⅰ.Effect of ratio of the inner radius to the outer one.
韓道興 嶺南大學校 工業技術硏究所 1982 연구보고 Vol.10 No.2
This paper examines the effect of ratio of the inner radius to the outer one ξ₁ on the conversion of isothermal single reaction in a radial flow fixed-bed reactor. The velocity of reactant gas is only related to ξ₁at the given feed condition and catalyst volume, so that the conversion of radial flow fixed bed is affected by the values of ξ₁. The results of exact and numerical analysis show that lower values of ξ₁ give higer conversion for the positive reaction order and lower conversion for the negative ones, but the values of ξ₁ have no effect on the conversion for the zeroth order reaction or in the plug flow reactor.
白金 擔持觸媒의 水素化 反應 : I. Vapor Phase Kinetics of Cyclohexene Hydrogenation Ⅰ. Cyclohexene의 氣相反應 速度論
李泰鎭,金潤甲,韓道興 嶺南大學校 工業技術硏究所 1985 연구보고 Vol.13 No.1
The kineticis of the vapor phase hydrogenation of cyclohexene over a Pt/SiO ₂was investigated in the temperature range 20∼70℃. The reaction was zero order with respect to cyclohexene; the order with respect to hydrogen was 0.53 at temperatures above 40℃ and increased toward unity at lower temperatures. Determination of the most plausible mechanism of the reaction was based on discrimination among various proposed Langmuir-Hinshelwood type models. Horiuti-Polanyi model fitted kinetic data adequately and hence may be accepted as the most plausible model. The shift in reaction order was explained by this Horiuti-Polanyi mechanism.
이태진,한도흥,채희권,엄성진 한국화학공학회 1986 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.24 No.4
부틸니트라이트의 카보닐화에 의한 부틸옥살레이트의 제조반응에 대하여 5wt% Pd/C, Pt/C, Ru/C, Rh/C 비균질촉매를 사용하여 연구하였다. 생성물의 분포에 영향을 미치는 금속과 산소와의 결합력의 세기를 근거로 하여 적합한 촉매를 선정하였다. 실험결과로 반응메카니즘을 제안하였고 실험조건에 따르는 전환률과 선택도의 변화를 조사하였다. The synthesis of butyl oxalate by carbonylation of butyl nitrite was studied using heterogeneous catalysts such as 5wt% pd/C, Pt/C, Ru/C and Rh/C. Selection of the catalysts was based on the strength of formed metal-oxygen bond which would determine probable product characteristics. Based on the experimental results, reaction mechanisms were proposed and effect of various experimental conditions on the conversion and selectivity was investigated.
김병남,한도흥,이동화,이승우 한국화학공학회 2008 Korean Journal of Chemical Engineering Vol.25 No.5
Poly(tetrafluoroethylene-co-hexafluoropropylene) (FEP) film was homogeneously and highly grafted by styrene monomer under simultaneous irradiation with an electron beam, whereas preirradiation with an electron beam was insufficient to accomplish a high degree of grafting without activation of the styrene monomer. Following its subsequent sulfonation, the styrene-grafted FEP film exhibited considerably higher values of both the IEC and IC and less methanol crossover than the Nafion membrane. The grafting of styrene onto the FEP polymer is thought to be initiated by the abstraction of F atoms from the CF3 groups in the polymeric structure. It was estimated that two sulfonic acid groups can be attached to the benzene ring of one styrene molecule. The profile of sulfur across the FEP film, which is related to the concentration profile of sulfonic acid groups inside the styrene-grafted FEP film, became more and more homogeneous over a period of several hours, due to the step by step diffusion of monomers into the film, eventually showing a high IC value of 0.25 S/cm in the case of the 125 μm thick FEP film, whereas Nafion 117 (125 μm thickness) exhibited an IC value of 0.12 S/cm.