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RISS 인기검색어
- 검색키워드
- 저자 : 최삼권(Sam Kwon Choi) (검색결과 43 건)
- 무료
- 기관 내 무료
- 유료
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최삼권,박달조,Sam Kwon Choi,Jeseph D. Park Korean Chemical Society 1977 대한화학회지 Vol.21 No.3
1-chloro-2-iodoperfluorocycloalkenes를 종전에는 DMF 용매속에서 KI를 사용하여 Halogen 교환반응에 의하여 합성하였으나 alkyllithium으로 금속교환반응을 통하여 iodination함으로써 반응시간이 단축되던지 특히 1,2-dichloroperfluorocyclohexene의 경우에는 더 높은 수득률의 1-chloro-2-iodoperfluorocyclohexene을 얻을 수 있었다. 그리고 1,2-dihaloperfluorocycloalkenes의 coupling 반응도 fluorocycloolefins과 동분을 DMF와 혼합하여 slurry를 만들어 이것을 sublimer속에서 감압하에 반응시키므로서 반응시간과 온도를 낮출 수 있었으며 생성물의 수득률도 많이 증가시킬 수 있었다. 대표적인 예로서 1-chloro-2-iodotetrafluorocyclobutene의 coupling 반응에 있어서는 종전에 비해서 더 높은 수득률의 coupling product를 얻을 수 있었다. 한편 coupling반응이 가능한 기구를 검토하고 그 생성물의 물리적 성질을 측정하여 확인하였다. The preparation of 1-chloro-2-iodoperfluorocycloalkenes was achieved with a short reaction time and a high yield when the starting compound was iodinated via the metalation process using an alkyllithium reagent. Especially, the high yield of 1-chloro-2-iodo-perfluorocyclohexene was obtained when 1,2-dichloroperfluorocyclohexene was iodinated via the same reaction conditions. The coupling reaction of 1,2-dihaloperfluorocycloalkenes was also achieved with a lower reaction temperature and a shorter reaction time when the equal slurry mixture of fluorocycloolefines and DMF was reacted at a high pressure in a sublimer. The yield of the coupling product was greatly improved by this process. For a typical example, the coupling reaction of the 1-chloro-2-iodotetrafluorocyclobutene was proceeded with a higher yield of the product than that of the reported reaction, when the present method was adopted. A plausible reaction mechanism of the present coupling reactiont was proposed and the physical characteristics of the coupling product were confirmed.
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$SO_2$/ KOH Catalysis에 의한 ${\varepsilon}$-Caprolactam의 음이온 중합 (제2보)
서길수,최삼권,Gil-Soo Suh,Sam-Kwon Choi 대한화학회 1977 대한화학회지 Vol.21 No.2
$SO_2$/KOH 촉매에 의한 ${\varepsilon}$-caprolactam의 음이온 중합을 시도하였으며 얻어진 중합체의 percent conversion 및 중합에 미치는 여러 요인을 조사하였고 중합체의 물리적 성질 및 반응속도에 대하여 고찰하였다. $SO_2$/KOH 촉매에 의하여 얻은 중합체는 hydrolytic polymerization에 의하여 제조된 nylon 6 보다 저온에서 중합이 가능하며 고유점도 및 융점이 더 높은 것으로 보아 중합도도 높으며 중합체의 분자 배열이 더 규칙적으로 배열되어 있다는 것을 추리할 수 있었다. Anionic polymerization of ${\varepsilon}$-caprolactam via $SO_2$/KOH catalysis was attempted in order to find an optimal reaction condition and physical properties of the polymers. The yield of conversion was relatively low at low temperature and high at high temperature between $150^{\circ}C\;to\;180^{\circ}C$ regardless of $SO_2$/KOH mole ratio in polymerization of ${\varepsilon}$-caprolactam.The inherent viscosity of nylon 6 obtained via $SO_2$/KOH catalysis was 1.2∼2.7. The kinetic equation for the $SO_2$/KOH catalyzed polymerization has been derived and experimentally verified.
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성좌경,최삼권,Seong, Chwa-Kyeong,Choi, Sam-Kwon 대한화학회 1957 대한화학회지 Vol.4 No.1
The organic titanium compounds, $Ti(OR)_4\;and\;Cl_2Ti(OR)_2$ were prepared by adding theoretical amounts of $TiCl_4$ to ROH in the medium of $CCl_4$. Among the compounds of the above two types, the former $Ti(OR)_4$was polymerized by refluxing them with R·OH and water at ordinary temperature and the latter, $Cl_2Ti(OR)_2$, by adding water to them.
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$CS_2$ / KOH Catalysis에 의한 ${\varepsilon}$-Caprolactam의 음이온 중합 (제3보)
구명서,최삼권,Koo Myeong-Seo,Choi Sam Kwon 대한화학회 1977 대한화학회지 Vol.21 No.6
$CS_2$/KOH catalysis를 이용해서 ${\varepsilon}$-caprolactam의 음이온중합을 시키고 percent conversion과 점도를 측정하였다. $80^{\circ}C,\;105^{\circ}C$의 비교적 낮은 온도에서는 $CS_2$/KOH mole ratio가 0.5일때 percent conversion이 가장 높았으며 또 KOH의 당량에 비례하여 percent conversion도 증가하였다. 그러나 $130^{\circ}C,\;155^{\circ}C$로 중합온도를 상승함에 따라 $CS_2$/KOH mole ratio와 KOH양에는 크게 관계없이 높은 percent conversion을 얻을 수 있었다. 그리고 30分 정도의 짧은 중합시간으로도 $80{\%}$ 이상의 높은 percent conversion을 얻을 수 있었다. The anionic polymerization of ${\varepsilon}$-caprolactam via $CS_2$/KOH catalysis was carried out under various conditions. The inherent viscosity of the polymers and percent conversion of the polymers were determined. It was observed that the percent conversion was increased as an increasing concentration of catalyst and initiator. The percent conversion was relatively low at low temperature and the highest percent conversion was obtained at temperature between $130^{\circ}C,\;to\;155^{\circ}C$ with any $CS_2$/KOH mole ratio.
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The Pyrolysis of Polytetrafluoroethylene
박달조,최삼권,Joseph D. Park,Sam kwon Choi Korean Chemical Society 1976 대한화학회지 Vol.20 No.2
Although teflon(PTFE) is quite stable at the normal fabrication temperature of 330 to 360$^{\circ}C$, it does undergo pyrolysis if it is maintained at temperature above 360$^{\circ}C$ for extended periods of time. The extent and rate of this pyrolysis increases as the temperature is raised and pressure is reduced. The pyrolysis was also carried out in the presence of copper, no significant change was observed. Scrap teflon으로부터 tetrafluoroethylene을 회수하기 위하여 Teflon을 온도와 압력등을 변화시키면서 열분해를 시도하였다. teflon은 내열성이 강하나 360$^{\circ}C$에서 장시간 유지하면 상압에서도 약간의 열분해가 일어난다. 얻어진 결과에 의하면 일반적으로 감압하에서 온도를 증가시키면 tetrafluoroethylene의 수득률이 상승하는 것을 알 수 있었다. 동분말을 사용하여 teflon의 분해를 시도하였으나, 현저한 변화를 볼 수 없었다.
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박달조,최삼권,Joseph D. Park,Choi Sam Kwon Korean Chemical Society 1973 대한화학회지 Vol.17 No.4
폴리플루오로알켄닐리튬 化合物들이 1,2-dihalopolyfluorocycloalkenes와 알킬리튬試藥과의 交換反應에 依하여 合成되었다. 수은, 비소와 디메틸게르마늄할로겐화물과의 여러 가지 反應이 著述되어 있고 또 이 化合物들의 化學的性質에 대하여 考察하였다. Polyfluorocycloalkenyllithium compounds have been prepared by exchange reaction with 1,2-dihalopolyfluorocycloalkenes and alkyllithium reagents. Their reactions with mercuric, arsenic and dimethyl germanium halides are described and the chemistry of these compounds discussed.
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N,N'-Adipyl-bis-${\n varepsilon}$-caprolactam과 KOH에 의한 ${\n varepsilon}$-Caprolactam의 음이온 중합
서환규,최삼권,Hwan-Kyu Shu,Sam-Kwon Choi 대한화학회 1976 대한화학회지 Vol.20 No.2
N,N'-Adipyl-bis-${\varepsilon}$-caprolactam을 개시제로 potassium hydroxide를 촉매로 하여 여러 가지 중합조건에서 ${\varepsilon}$-caprolactam의 음이온 중합을 시도하였다. 중합최적조건은 촉매와 개시제의 농도가 각각 4.2와 1.6 mole%, 중합온도 130$^{\circ}C$, 중합시간 1.5시간 일때이었다. 얻어진 중합체의 intrinsic viscosity는 0.9 dl/g, 분자량 12,000이상이었고 융점은 219$^{\circ}C$였다. Acyl type개시제의 반응성은 N,N'-adipyl-bis-${\varepsilon}$-caprolactam이 가장 크고 N-benzoyl-${\varepsilon}$-caprolactam, N-acetyl-${\varepsilon}$-caprolactam의 순서로 감소하였다. Intrinsic viscosity,와 중합변화율은 촉매와 개시제의 농도증가에 따라 증가하였으며 중합온도에 크게 의존하였다. The anionic polymerization of ${\varepsilon}$-caprolactam with N,N'-adipyl-bis-${\varepsilon}$-caprolactam as an initiator and potassium hydroxide as a catalyst was studied under various conditions.It was found that concentration of catalyst and initiator was 4.2 and 1.6 mole %, and polymerization temperature of 130$^{\circ}C$C, polymerization time of 1.5 hours was the optimum condition. The intrinsic viscosity and molecular weight of the obtained polymer was over 0.9 dl/g and 12,000. The polymerization was carried out in the presence of N-acyl-${\varepsilon}$-caprolactam as an initiator, it was observed that the reactivity of N,N'-adipyl-bis-${\varepsilon}$-caprolactam was greater than both of the N-benzoyl-${\varepsilon}$-caprolactam and N-acetyl-${\varepsilon}$-caprolactam. In general it was also observed that the intrinsic viscosity and yield of conversion was increased as an increasing of concentration of catalyst and initiator and also highly depend on temperature.
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