http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
자유라디칼 Telomerization 에 의한 스티렌메타크릴산메틸 Block 혼성중합체의 합성 및 분석 (제1보)
박정학,서길수,최삼권,Jung Hag Park,Gil Soo Sur,Sam Kwon Choi 대한화학회 1980 대한화학회지 Vol.24 No.3
자유라디칼 telomerization 반응을 이용하여 스티렌-메타크릴산메틸 block 혼성중합체 (PS-b-PMMA)를 합성하였다. AIBN을 개시제로 사용하여 CCI$_4$로 스티렌을 telomerization시킨 다음 생성된 중합체의 $CCI_3$ 말단기를 macrotelogen으로 사용하여 AIBN 개시에 의해 메타크릴산 메틸을 다시 telomerization하여 스티렌-메타크릴산메틸 block 혼성중합체를 얻었다. Macrotelogen의 농도, 단위체의 농도, macrotelogen의 분자량, 반응온도 및 용매의 농도가 block 혼성중합체생성에 미치는 영향을 조사하였다. 반응조건을 조절하여, PMMA가 약 10무게%까지 포함된 block 혼성중합체를 얻었다. Poly (styrene-b-methyl methacrylate) (PS-b-PMMA) was synthesized by free radical telomerization: the telomerization of styrene with $CCI_4$ by using AIBN as initiator followed by a second telomerization of methyl methacrylate using $CCI_3$ end group of the resulting polymer as the macrotelogen, with AIBN initiation, gave the styrene-methyl methacrylate block copolymer. The effects of the concentration of the macrotelogen, the concentration of monomer, the molecular weight of the macrotelogen, the reaction temperature and the concentration of the solvent on the formation of the block copolymer were investigated. Block copolymers containing up to 10 weight percent PMMA were obtained by adjusting the reaction conditions.
고분자-금속착물 (제2보). 몇가지 Ni(II)-Polyethyleneimine 착물의 촉매활성도
박정학,조태섭,Jung Hag Park,Tae Sub Cho 대한화학회 1981 대한화학회지 Vol.25 No.6
두 가지의 팔면체형 Ni(II)-polyethyleneimine (PEI) 착물, [Ni(PEI)]$Cl_2$ 및 [Ni(PEI)$Cl_2$]를 합성하여 과산화수소 분해반응에서 이들 착물의 촉매활성도를 조사하고, 유사한 구조를 한 ethylenediamine 착물, $[Ni(en)_3]Cl_2$ 및 $[Ni(en)_2Cl_2$의 촉매활성도와 비교해 본 결과, 다음과 같은 순서로 촉매 활성도가 증가함이 관찰되었다 : $0{\approx}[Ni(en)_3]Cl_2{\le}[Ni(en)_2Cl_2]<[Ni(PEI)]Cl_2<[Ni(PEI)Cl_2]$ 가시선 및 적외선 흡수 스펙트럼을 측정하여 두 가지 Ni(II)-PEI 착물의 구조를 조사하여 본 결과 이들 착물의 촉매활성도는 배위자와 Ni(II)이온사이의 결합세기에 의존함을 알 수 있었다. Two types of Ni(II)-polyethyleneimine (PEI) complexes, [Ni(PEI)]$Cl_2$ and [Ni(P-EI)$Cl_2$] were synthesized and their catalytic activities in the decomposition reaction of hydrogen peroxide were investigated. For the purpose of comparison, the corresponding monomeric complexes, $[Ni(en)_3]Cl_2$ and $[Ni(en)_2Cl_2$ were also prepared; it was observed that their activities increase in the following order; $0{\approx}[Ni(en)_3]Cl_2{\le}[Ni(en)_2Cl_2]<[Ni(PEI)]Cl_2<[Ni(PEI)Cl_2]$ On the basis of structural analysis by means of visible and infrared spectroscopy, the catalytic activiy of these Ni(II)-PEI complexes is assumed to depend on the bond strength between the ligand and the nickel ion.
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.
Fe(III)와 Xylenol Orange의 착물형성에 대한 분광광도법적 연구
오대섭,이선행,박정학,O Tae Sub,Lee Sun Haing,Park Jung Hag 대한화학회 1978 대한화학회지 Vol.22 No.5
Fe(III)과 Xylenol Orange (XO 또는 $H_6A$)의 반응을 분광광도법으로 연구하였다. Fe(III)과 XO는 조성이 Fe(III) : XO = 2 : 1 및 1 : 1 인 두가지 착물을 형성함을 확인하였다. 2 : 1 착물은 XO보다 Fe(III)를 많이 포함한 산성에서 안정하고, 1 : 1 착물은 XO가 많이 포함된 약산성용액에서 안정하다. 흡수극대는 590nm(2 : 1)와 500nm(1 : 1)이고 몰흡광계수는 각각 $3.18{\pm}0.04{\times}10^4,\;1.32{\pm}0.03{\times}10^4$이다. pH값을 변화시키면서 측정한 두 착물의 안정도상수는 $log{\beta}_{21}=18.69{\pm}0.03,\;log{\beta}_{212}=42.08{\pm}0.09,\;log{\beta}_{11}=4.17{\pm}0.04,\;and\;log{\beta}_{113}=34.47{\pm}0.07$이었다. The reaction between iron(III) and Xylenol Orange (XO or $H_6A$) has been investigated spectrophotometrically. It has been established that iron (III) and XO form two complexes with compositions iron(III) : XO = 2 : 1 and 1 : 1. The 2 : 1 complex is stable in acidic medium containing excess of iron, and 1 : 1 complex is stable in slightly acidic medium containing excess of XO. The absorption maxima are at 590 nm (2 : 1) and 500 nm (1 : 1), the molar absorptivities being $3.18{\pm}0.04{\times}10^4,\;1.32{\pm}0.03{\times}10^4$respectively. The stability constants of two complexes studied by varying pH are $loglog{\beta}_{21}=18.69{\pm}0.03,\;log{\beta}_{212}=42.08{\pm}0.09,\;log{\beta}_{11}=4.17{\pm}0.04,\;and\;log{\beta}_{113}=34.47{\pm}0.07.$
Polyethyleneimine-Cr(Ⅲ) 착(錯)물(物)의 분광학적(分光學的) 특성(特性) 및 과산화소(過酸化水素) 분해반응(分解反應) 촉매(觸媒)활성도(活性度)
박상오 ( Sang Oh Park ),박정학 ( Jung Hag Park ),이상협 ( Sang Hyup Lee ) 경북대학교 과학교육연구소 1982 科學敎育硏究誌 Vol.6 No.-
Cr (Ⅲ) comp lexes with polyethyleneimine as l i gand were prepared in absolute ethanol by varying PEI/Cr(Ⅲ) mole ratio and temperature. The effects of PEI/Cr(Ⅲ) mole ratio and reaction temperature on the yield of the resulting complexes were investigated.[Cr(PEI)]Cl3, [Cr(PEI)]2(so4)3 and [Cr(PEI)] (C2H3O2)3 were insoluble in most of organic solvent but very soluble in H2O. The structures of PEI-Cr(Ⅲ) complexes were characterized by means of infrared and visible spectroscopy. Catalytic activities of the complexes on the decomposition reaction of hydrogen peroxide wire investigated and it was found that catalytic activities decrease in the following order: [Cr(PEI)]CI 3>[Cr(PEI)]2(SO4)3>[Cr(PEI)] (C2H3O2)3> [Cr(en)3]I 3> [Cr(en)3]Br3> [Cr(en)3]CI 3 □ 0. On the basis of structural analysis by means of visible and infrared spectroscopy, the catalytic activity of Cr(Ⅲ) complexex is assumed to depend on the bond strength of Cr(Ⅲ) and ligand.
고분자-금속착물(Ⅳ)ㆍPolypropyleneimine-Ni(Ⅱ) 착물의 촉매활성도
金東洙,曺泰燮,石元慶,朴正學 嶺南大學校附設 基礎科學硏究所 1982 基礎科學硏究 Vol.2 No.-
이상의 실험결과로 보아 중합체 리간드 사슬에 치환기가 있거나, 분자량이 큰 중합체 리간드는 금속착물의 촉매작용을 증가시키는 것을 알 수 있으며, 치환기의 크기를 변화시키거나 증합체의 분자량을 조절함으로써 금속착물의 촉매작용을 조절할 수 있다는 것을 알 수 있다. 메틸기보다 더 큰 알킬기(에틸,n-프로필 등)를 가졌거나 여러가지 분자량을 가진 중합체 리간드로 된 금속착물의 합성 및 촉매활성도 조사가 현재 진행중에 있으며 이 실험결과는 이미 합성된 PPI 리간드의 분자량과 함께 다음의 완보에 발표될 것이다.
광학활성 아미노포스핀류를 포함하는 로듐(Ⅰ) 착물과 합성과 적외선 스펙트럼에 관한 연구
都命基,金奉坤,朴正學 嶺南大學校附設 基礎科學硏究所 1982 基礎科學硏究 Vol.2 No.-
Wilkinson-type Rh(Ⅰ) complexes containing 1,5-cyclooctadiene and optically active aminophosphines such as trans-(1R,2R)-1,2-bis[N-methyl(diphenylphosphino)amino]cyclohexane(L₁), trans-(1R,2R)-1,2-bis[(diphenylphosphino)amino]cyclohexane(L₂), (R)-1,2-bis[N-methyl(diphenylphosphino)amino]propane(L₃),(R)-1,2-bis[(diphenylphosphino)amino]propane(L₄), which were used as homogeneous catalysts with stereoselectivity in asymmetric hydrogenation reaction for olefins, were prepared and the bond character of Rh(Ⅰ) ion and phosphorus atom in aminophosphines and of Rh(Ⅰ) ion and 1,5-cyclooctadiene were studied by means of IR spectroscopy.
朴正學 嶺南大學校附設 基礎科學硏究所 1981 基礎科學硏究 Vol.1 No.-
Two polymer-Cu(Ⅱ) complexes with polyethyleneimine(PEI) or polypropyleneimine(PPI) as ligand, Cu(PEI)Cl₂and Cu(PPI)Cl₂, were prepared and their catalytic activities on the aerobic oxidation reaction of L-ascorbic acid(LAA) were investigated and compared with those of corresponding monomeric complexes, Cu(en)₂Cl₂ and Cu(pn)₂Cl₂. It was observed that the catalytic activity of Cu(PEI)Cl₂ was twice as large as that of Cu(en)₂Cl₂, which was a little larger than Cu(pn)₂Cl₂ in the catalytic activity and that the rate of reaction was a zero order reaction in regard to the concentration of the residual LAA in the reaction mixture. Cu(PPI)Cl₂was found to retard the aerobic oxidation of LAA. On the basis of structural analysis by means of visible spectroscopy, the catalytic activity of these Cu(Ⅱ) complexes is assumed to depend on the bond strength between the ligand and the copper ion.