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[Cp₂Ti(Ⅲ)(1-benzoylacetonato)화합물과 알킬알루미늄화합물의 촉매계에 의한 스티렌 중합반응
이삼근,이동구 대전대학교 기초과학연구소 2002 自然科學 Vol.13 No.1
[Cp₂Ti(Ⅲ)(1-benzoylacetonato)과 조촉매인 알킬알루미늄화합물로 구성된 촉매계를 이용하여 스티렌을 중합하였으며, 생성된 고분자는 ^(13)C NMR 스펙트럼 연구결과 atatic-폴리스티렌이었다. 고분자 반응에 영향을 주는 조건인 주촉매의 농도, 조촉매인 DEAC의 농도와 주촉매의 농도 비율, 반응시간 및 반응온도에 따른 연구를 수행하였다. 고분자 반응은 반응온도에 영향을 받지 않으며 폴리스티렌으로의 전환 비율이 가장 큰 경우는 DEAC의 농도와 주촉매의 농도 비율이 30인 경우이며 고분자 반응은 6시간만에 완료된다. 연구한 조건에서 생성된 폴리스티렌의 분자량은 2,200 - 3,200이었으며, 중합온도가 증가하면 분자량은 감소하고 분산도는 증가하며, 티타늄 촉매에 대한 조촉매의 몰 비율을 증가시키면 분자량과 분산도가 증가하는 경향을 보였다. Polystyrene was prepared in the presence of a catalyst composed of [Cp₂Ti(Ⅲ)( 1-benzoylacetonato)] and alkylaluminum as cocatalyst. The resultant polymer is atatic-polystyrene judging by ^(13)C NMR spectra. Influences of various polpmerizations, e.g., [Ti], [DEACI/"Til, time and temperature were studied. It was found that polymerization reaction is not dependent on the reaction temperature, and the highest conversion of styrene to polystyrene can be obtained when the molar ratio of [DEAC] to [Ti] is 30. The polymerization reaction is almost finished in 6 hours. The molecular weight of the polystyrene ranged from 2,200 to 3,200 and was decreased and the molecular weight distribution was increased with increasing the reaction temperature. The higher the molar ratio of DEAC to titanium catalyst was used, the higher was the molecular weight and the molecular weight distribution.
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鎭海灣에 出現하는 有毒鞭毛操類의 分類 II 下痢性 貝毒種-Dinophysis屬
文成基,李三根 慶星大學校 1991 論文集 Vol.12 No.3
The classification of Dinophysis, responsible for DSP(diarrheic shellfish poison)was investigated during the period from 1984 to 1990 in Chinhae Bay. Identification was carried out by light microscopy and scanning electron microscopy. We identified 4 species: Dinophysis acuminata, Dinophysis caudata, Dinophysis fortii, and Dinophysis rotundata, Among those Dinophysis acuminata and Dinophysis fortii were discovered as causative orgnisms of DSP
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김응식,이삼근,이범장 조선대학교 스포츠과학연구소 1991 스포츠科學硏究 Vol.4 No.-
Excess weight seems to be one of the worst pathological phenomena and is expected to influence the lives and health of the next generations in our society. The problematic excess weight of children should be recognized to the fullest and examined exactly for its effective cure and prevention at an early stage. This study which was carried out on 1096 obesity children out of 5918 elementary school pupils in kwang ju aims to solve childres excess weight problem. The results are as follows : 1. The economic level of obesity children is not so hight, judging from their fathers, occupations. A high rate of obesity children are from families in which the children’s fathers are salaried men such as public servants and company employes and their mothers are housewives. 2. Heredity is not shown to be an absolute factor, fo their parents, physical stature and characteristic dose not have much to do with children's weight. Universality isshown in obesity children's time to go to Sleep and their amount of sleep. 3. Fifty percent of them are positiv playing and to play, but in reality do not play regularly. The activites in which they participate are shown to be very simple and there is likely to be little effct a guide. The reason for this is consideres to be due to lack of playing facili-ties and not such a good residential environment. 4. Physiscal education class in schools are shown to be intersting to 56 percent of them. Among the big reasons for reasons for their not being intersting are that it is strennuous and the content is uniteresting. This means that there are some problem in the operation of classes. 55.9 percent of male pupils and 64.3 percent of female ones are shown to go to private institues to study rather to go to gyms after school. 5. There is not shown to be particular chactisties in kind of food because they like almost every kind of food. It is shown that their food is high-caloried and that they eat plenty of meat and that like between-meal snacks. And they eat most between meals. 6. Fifty-there percent of overweight children are shown to have a nickname related to their wright and most common nicknames are "pig" and "pumpkin". But being overweight does not give the children mental stress. Being obesity is not shown to be of mush insonvenience in body movement but about 50 percent of the obesity children are shown to have at leat ince been made fun of or looked down upon in playing. 7. Eighty-three percent of them check their weight in pulic bathes and it is considered to positive. Parents and shown not to strongage children to take excerise, not to be worried about their being overweight, and not to resognize its possible ill effects when the children grow up. 8. Being obesity is shown to have little to do with the chilldren's academic achievment and personal character. The possibility of treating overweight children is that the are willing to undergo a considerable amount of physical exercise and good regulation.
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