http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
박영욱,서길수,최삼권,Y. K. Park,G. S. Sur,Sam K. Choi 대한화학회 1980 대한화학회지 Vol.24 No.2
3-(N-Carbonylpyrrolidone)-propanoic acid의 potassium-salt와 3-N-carbonyrrolidone)-propenoic acid의 potassium-salt를 합성하고 이것을 2-pyrrolidone 음이온중합의 개시제로 사용하여 그 효과를 조사하였다. $50^{\circ}C$에서 KOH의 농도를 2mole%로 고정시키고, 개시제를 1.5, 1.0, 0.5mole%로 변화시켰을때 1.0mole%에서 좋은 결과를 얻을 수 있었다. 3-(N-Carbonylpyrrolidone)propenoic acid K-salt/KOH catalysis에 의하여 합성한 nylon 4의 inherent viscosity는 2.3dl/g이였고 3-(N-carbonylpyrrolidone)-propanoic acid K-salt 개시제에 의하여 합성한 중합체의 ingerent viscosity는 1.2dl/g이었다. 3-(N-Carbonylpyrrolidone)-propanoic acid potassium-salt and 3-(N-carbonylpyrrolidone)propenoic acid potassium-salt were synthesized by the reaction of 2-pyrrolidone potassium-salt with succinic anhydride and maleic anhydride in acetone and in acetone and in benzene. The anionic polymerization of 2-pyrrolidone with 3-(N-carbonylpyrrolidone)-propanoic acid potassium-salt or 3-(N-carbonylpyrrolidone)-propenoic acid potassium-salt as an initiator and potassium hydroxide as a catalyst was studied. It was found that 2.0 and 1.0 mole %, concentration of catalyst and initiator, and temperature of $50^{\circ}C$ was the optimum condition obtaining highest conversion and viscosity of polymer. The inherent viscosity of nylon 4 was measured to be 1.2 dl/g and 2.3 dl/g.
박정학,정발,최삼권,Jung Hag Park,Bal Jung,Sam K. Choi 대한화학회 1980 대한화학회지 Vol.24 No.2
PPBC/KOH 촉매작용에 의한 2-pyrrolidone의 음이온중합에 있어서 PPBC/KOH 몰비, KOH의 농도 및 온도가 중합에 미치는 영향을 조사하였다. PPBC/KOH 몰비가 0.5일때 중합속도가 가장 빠르고 전환율도 가장 높았으며, 또 KOH 의 농도는 2몰%일때 가장 높은 전환율과 점도가 얻어졌다. $50^{\circ}C$에서의 중합은 $30^{\circ}C$에서의 중합보다 초기반응속도는 빠르나 시간이 경과할 수록 전환율과 점도가 오히려 낮아지는 경향이 관찰되었다. 최소자승법으로 계산하여 구한 중합속도상수$(k_p)$의 값은 $30^{\circ}C$일때 $22.4\;l/mole{\cdot}hr$ 였고 $50^{\circ}C$일때 $191.9\;l/mole{\cdot}hr$ 였다. Anionic polymerization of 2-pyrrolidone was carried out via PPBC/KOH catalysis. The effects of PPBC/KOH mole ratio, KOH concentration and temperature on polymerization have been investigated. It was observed that the highest rate of polymerization and maximum conversion were obtained when PPBC/KOH mole ratio was around 0.5. The maximum conversion and the highest viscosity were obtained when the concentration of KOH was 2 mole percent. It was also found that while the rate of polymerization at $50^{\circ}C$ was higher than at $30^{\circ}C$ in the initial stage of polymerization, the conversion and viscosity were decreased as polymerization time was extended. The rate constant $(k_p)$ of polymerization was determined by least square method; the values of $k_p$ obtained were $22.4\;l/mole{\cdot}hr\;at\;30^{\circ}C\;and\;191.9\;l/mole{\cdot}hr\;at\;50^{\circ}C$, respectively.
Mishra, Joy K.,Chang, Young-Wook,Choi, Nak Sam Wiley Subscription Services, Inc., A Wiley Company 2007 Polymer engineering and science Vol.47 No.6
<P>Rubber-toughened poly(trimethylene terephthalate) (PTT)–organoclay nanocomposite (RTPTTCN) was prepared by a melt mixing technique. The rubber-toughened PTT (RTPTT) was made by blending it with ethylene propylene diene terpolymer (EPDM) and with a small amount of maleated EPDM as a compatibilizer. XRD and TEM analysis indicated that the RTPTTCN forms a partially exfoliated nanocomposite. It was observed from SEM analysis that the clay nanoparticles induced a reduction of rubber particle size in the PTT matrix. Tensile and dynamic mechanical analysis indicated that the clay nanoparticles enhance the stiffness of the RTPTT without adversely affecting its toughness. Melt rheological studies revealed that the nanocomposites exhibited strong shear thinning behavior, and a percolated network of the clay particles was formed. It was also observed from DSC that the clay nanoparticles caused an increase in the nonisothermal crystallization temperature of the PTT. POLYM. ENG. SCI., 47:863–870, 2007. © 2007 Society of Plastics Engineers</P>
S-374 The Predictors of Survival of Pneumocystis Jirovecii Pneumonia in Non-HIV Patients
( Ji Soo Choi ),( Myung Jin Song ),( Bo Ra Yoon ),( Ah Young Leem ),( Joo Han Song ),( Kyung Soo Chung ),( Song Yee Kim ),( Eun Young Kim ),( Ji Ye Jung ),( Moo Suk Park ),( Young Sam Kim ),( Se Kyu K 대한내과학회 2016 대한내과학회 추계학술대회 Vol.2016 No.1
Background: Pneumocystis jirovecii pneumonia (PCP) in non-HIV patients is more fatal than HIV patients, and typically present with an abrupt onset of respiratory insufficiency. To aim of this study was to evaluate the outcomes and predictors of mortality in PCP in Non-HIV critically ill patients with respiratory failure. Method: This retrospective study enrolled 81 non-HIV patients who were diagnosed and treated PCP with respiratory failure requiring the medical intensive care unit (ICU) management from January, 1, 2013 to December, 12, 2015. The patients were diagnosed through positive polymerase chain reaction (PCR, nested PCR to detection of 260bp, Thermalcycler S1000 (BIO-RAD, USA)) and typical clinical symptoms and radiological findings. PCP PCR was followed up weekly for check the negative conversion. Results: The ICU overall survival rate of PCP was 35.8% (29/81). Seventy-four patients (91.3%) required mechanical ventilation, and six patients (7.4%) required high-flow nasal oxygen treatment. In total, PCP PCR negative conversion rate is 70.5% (55/81) with a median duration of 10 (7.00-14.00) days. In univariate analysis, APACHE II score (p<0.001), renal failure requiring renal replacement therapy (p=0.04), PCP PCR negative conversion (p=0.003), and PaO2/FiO2 ratio within initial 24 hours (p<0.001) were related to mortality of PCP patients. In multivariate analysis, PCP PCR negative conversion (adjusted OR 7.424; 95% CI 1.957-28.160, p=0.003) and PaO2/FiO2 ratio within initial 24 hours (adjusted OR 0.987; 95% CI 0.979-0.996, p=0.003) were associated with prognosis of PCP in non-HIV patients with respiratory failure. Conclusions: PCP PCR negative conversion and PaO2/FiO2 ratio within initial 24 hours are prognostic factor of severe PCP in non-HIV patients with respiratory failure. Furthermore, following up PCP PCR negative conversion or not may be predictive factor to failure of initial anti-pneumocystic medication. In conclusion, early diagnosis and prompt treatment are significant to manage with PCP in non-HIV patients.
관능성 단량체 및 중합체 (제1보). Lactam 고리를 함유하고 있는 Acryloyl 형 단량체의 중합
노석균,서길수,최삼권,S. K. Noh,G. S. Sur,Sam K. Choi 대한화학회 1980 대한화학회지 Vol.24 No.1
새로운 acrylimide로서 N-acrylylpyrrolidone을 합성하였다. N-Acrylylpyrrolidone은 N-methacrylyl-lactam과는 다르게 homopolymerization을 열적으로도 함을 관찰하였다. Styrene과 N-acrylylpyrrolidone의 공중합시 각 monomer의 reactivity ratio를 구하였다. 그 결과 생성되는 copolymer는 pyrrolidone의 음이온 중합에 적절한 acyl-lactam function을 가지고 있음을 알았다. The synthesis of N-acrylylpyrrolidone has been carried out by the reaction of pyrrolidone and acrylyl chloride. The study on the copolymer of N-acrylylpyrrolidone and styrene is attempted.The copolymerization of N-acrylylpyrrolidone and styrene is carried out in benzene.Monomer reactivity ratio of N-acrylylpyrrolidone and styrene was calculated by Fineman and Ross equation. It is observed that the copolymer of N-acrylylpyrrolidone and styrene has random distributed acyl-lactam function on the vinyl polymer backbone.