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성용길,송대경,박경희,Sung, Yong-Kiel,Song, Dae-Kyung,Park, Kyung-Hee 대한의용생체공학회 1988 의공학회지 Vol.9 No.2
Poly (L- lactic acid-co-glycine-L-lactic acid) and Poly (L-lactic acid-co-glycine-L- methyl lactic acid ) have been prepared by ring opening polymerization. The monomer 6, 6-dimethyl morpho-line-2, 5-dione was synthesized by the bromoisobutylation of 2-bromoisobutyryl bromide with glycin e. L-lactide, 6-methyl morpholine-2, 5-diode. and 6, 6-dimethyl morpholine-2, 5-diode have been used as starting materials for polydepsipeptides. The synthesized monomers and copolymers have been identified by NMR and FT-lR spa- ctrophotometer. The thermal propert ies and glass transition temperature(Tg) of the copolymers have been measured by differential scanning calorimetry. The Tg values of poly(L-lactic acid co-glycine-L-lactic acid) system are increased from $53^{\circ}C\; to\; 107^{\circ}C$ with increasing the mole fraction of 6-methyl morpholine-2, 5-diode. And the Tg values of poly(L-lactic acid co-glycine-L-methyl lactic acid) system are increased from $53^{\circ}C\;to\;138^{\circ}C$ with increasing the mole fraction of 6. 6-dimethyl morpholine-2, 5-diode The thermal stability of poly (L-lactic acid-co-glycine-L-methyl lactic acid) is slightly greta text than that of poly(L-lactic acid-co-glycine-L-lactic acid) due to the methyl group.
NMR Relaxation of Water Protons in Hydrophilic Poly(HEMA) Hydrogels
성용길,Sung, Yong Kiel Korean Chemical Society 1995 대한화학회지 Vol.39 No.5
2-Hydroxyethyl methacrylate(HEMA)와 ethylene glycol dimethacrylate(EDGMA)로부터 수용액중에서 친수성 3차원 메타아크릴레이트 고분자 망상의 수화겔을 제조하여 NMR 분석법에 의해 그 친수성 메타아크릴레이트와 물 사이의 상호작용에 대하여 연구하였다. 적은 양의 물을 함유하고 있는 수화겔의 스핀-격자 이완시간$(T_1)$을 측정한 결과 물 양성자 주위의 다른 두 환경에 따른 $T_{1a}$와 $T_{2b}$가 나타났다. Poly(2-hydrocyethyl methacrylate)[p(HEMA)]-$(10{\%}\; H_2O)$ 수화겔에 대한 $T_{1a}$와 $T_{1b}$가 각각 $16.4{\times}10^{-3}\; sec$와 $58.2{\times}10^{-3}\;sec$이고, 가교된 EGDMA-p(HEMA)- $(10{\%}\; H_2O)$ 수화겔에 대한 $T_{1a}$와 $T_{2b}$가 각각 $13.2{\times}10^{-3}\; sec$와 $23.1{\times}10^{-3}\; sec$이었다. 또한 수화겔들에 대해 스핀-스핀 이완시간$(T_2)$를 측정한 결과 $p(HEMA)-(H_2O)_n$ 및 가교된 $EDGMA-p(HEMA)-(H_2O)_n$의 계에 $(T_2)$값은 물 함량이 증가함에 따라 증가하였다. $(T_2)$값들은 $(T_1)$의 값들보다 약 10배 작게 나타나고 스핀이완원리와 일치하였다. The hydrogels of hydrophilic three-dimensional methacrylate polymer networks were prepared from 2-hydroxyethyl methacrylate (HEMA) and ethylene glycol dimethacrylate (EDGMA) in aqueous solution. The interaction of water with the hydrophilic methacrylate polymers in the hydrogels was studied by pulse NMR spectroscopy. The spin-lattice relaxation times (T1) of low water content hydrogels showed the different double environments, resulting in two spin-lattice relaxation times (T1a and T1b). The values of T1a and T1b were 16.4${\times}$10-3 sec and 58.2${\times}$10-3 sec for a p(HEMA)-(10% H2O) system, and 13.2${\times}$10-3 sec and 23.1${\times}$10-3 sec for a crosslinked EGDMA-p(HEMA)-(10% H2O) system, respectively. The spin-spin relaxation times (T2) of the hydrogels were also measured as a function of water content in the p(HEMA)-(H2O)n and crosslinked EGDMA-p(HEMA)-(H2O)n system. The values of T2 were approximately 10 times less than those of T1 in agreement with the principles of spin relaxations.
Thermodynamic Properties of Aliphatic and Aromatic Hydrocarbons in Liquid Water
성용길,김은식,전무식,Sung Yong Kiel,Kim Un Shik,Jhon Mu Shik Korean Chemical Society 1972 대한화학회지 Vol.16 No.5
지방족 및 방향족 탄화수소의 수용액을 Jhon 등이 제창한 liquid water의 significant structure theory 를 이용하여 연구하였으며 Helmholtz free energy, internal energy, entropy, heat capacity 등의 열역학적 성질을 계산하였다. 계산결과는 문헌에 발표된 실험치와 잘 일치됨을 볼 수 있다 The aqueous solutions of aliphatic and aromatic hydrocarbons have been studied on the basis of the significant structure theory of liquid water proposed by Jhon, et al. The thermodynamic properties such as Helmholtz free energy, internal energy entropy, and heat capacity have been calculated. The results show good agreements with the experiments in the literature.
Further Applications of the Solubility Theory to Various Systems
성용길,백우현,전무식,Sung, Yong-Kiel,Paek, U-Hyon,Jhon, Mu-Shik Korean Chemical Society 1971 대한화학회지 Vol.15 No.4
The theory of solubility proposed by Jhon and Kihara has been tested and applied to various systems. In the present paper, the systems are the solubilities of gases such as $Ar,\;H_2,\;N_2,\;O_2,\;CO_2,\;CH_4,\;and\;C_2H_6$ in liquid benzene and carbon disulfide, those of solids iodine and naphthalene in the nonaqueous solvents, and those of gases $H_2,\;N_2,\;O_2,\;Ar,\;CH_4,\;and\;C_2H_4$ in the electrolyte solutions. The theoretical values of solubilities are in good agreement with the experimental data in the literature.
중성과 다중 전하를 가진 $C_{60}$의 상대적 안정도, 이온화 에너지 및 화학 반응성
성용길,손만식,Sung, Yong Kiel,Son, Man Shick Korean Chemical Society 1997 대한화학회지 Vol.41 No.3
전편[Bull. Korean Chem. Soc. 1995, 16, 1015]에 기초하여 중성과 다중 전하를 가진 $C_{60}$이온에 대하여 상대적 안정도, 이온화 에너지 및 화학 반응성을 연구하였다. $C_{60}^{1-}$이 가장 안정하며, 이온화 에너지는 15.31 eV($C_{60}^{2+}$)로부터 -13.01 eV($C_{60}^{6-}$)까지 값을 갖는다. 또한 전하와 이온화 에너지의 상관 관계에서 직선관계가 나타났으며, 전하당 평균 이온화 에너지는 3.15 eV(계산값)와 3.22 eV(상관관계값) 이었다. 양의 전하를 띤 $C_{60}$ 이온의 전하-이동 및 전자-이동 반응은 게스트 분자의 이온화 에너지가 호스트 $C_{60}^{n+}$의 전자 친화도보다 더 낮을 때 일어남을 알 수 있었다. 이때, 이온화 에너지와 전자친화도의 에너지 차이(${\Delta}_{IP-EA}$)가 클 때는 전하-조절 효과에 의하여 전하-이동 반응이 일어나며, 그 에너지 차이가 작을 때는 프론티어-조절 효과에 의하여 전자-이동 반응에 의하여 일어남을 확인하였다. On the basis of our previous paper[Bull. Korean Chem. Soc. 1995, 16, 1015], the relative stability, ionization potential, and chemical reaction of the neutral and multiply charged $C_{60}$n ions(n=3+ to 6-) have been investigated by the semi-empirical MNDO method. $C_{60}^{1-}$ has the highest stability. The ionization potential values of the $C_{60}$ ions range from 15.31 eV of $C_{60}^{2+}$ to -13.01 eV of $C_{60}^{6-}$. These values show a linear relationship according to charges. The average IP per charge is 3.15 eV from our calculations and 3.22 eV from the linear function of IP. A charge- or electron-transfer reaction of $C_{60}^{n+}$ will only occur if the ionization potential of any guest molecule is lower than the electron affinity of the host $C_{60}^{n+}$. If the energy gap between ionization potential and electron affinity, ${\Delta}_{IP-EA}$, is high, charge-transfer reactions arise by the charge-controlled effect. However, if ${\Delta}_{IP-EA}$ is low, electron-transfer reactions arise by the frontier-controlled effect.
생체적합성 공중합체의 합성과 물성에 관한 연구 -Block Copoly (L-Lactde-$\gamma$-Benzyl-L-Glutamate)-
성용길,김훈,송대경,김영순,백우현,Sung, Yong-Kiel,Kim, Hoon,Song, Dae-Kyung,Kim, Young-Soon,Paek, U-Hyun 대한의용생체공학회 1988 의공학회지 Vol.9 No.2
Block copoly(L-lactide-${\gamma}$-benzyl-L-glutamate)was synthesized from L-lactide by cationic ring opening polymerization and ${\gamma}$-benzyl-L-glutamate N-carboxy anhydride by introducing amino group terminated poly(L-lactide). L-lactide was polymerized in the presence of stannous octate at $110^{\circ}C$ and ${\gamma}$-benzyl- L-glutamate was polymerized in the presence of NaH at room temperature. The synthesized monomers and copolymers were identified by IR and NMR. The Itermal properties of the copolymers were characterized by differential scanning calorimetry and thermogravimetry. The thermal stability and melting temperature(Tm) of the block copolymers were measured and discussed. The activation energies of thermal decomposition for the block copoly(L-lactide-${\gamma}$ benzyl-L-glutamate) were evaluated from the thermogravimetric data by Freeman and Carroll method.
2-히드록시에틸 메타크릴레이트와 기능성 사이레인 단량체와의 공중합에 관한 연구
성용길,이창규,정일남,Sung, Yong-Kiel,Lee, Chang-Gyu,Jung, Il-Nam 대한의용생체공학회 1987 의공학회지 Vol.8 No.1
2-Hydroxyethyl methacrylate(HEMA) was copolymerized with allyltrimethylsilane- (ATMS) and allylt.imethoxysilane(ATMOS) at 70。C in N, N'dimethylformamide- (DMV) using $\alpha$ , $\alpha$'-azobisisobutyronitrile(AIBN). The compositions of unreacted monomers were determined by gas chromatographic analysis. The monomer reactivity ratios were determined by Fireman-Ross, Helen-Tiidus and intersection methods. The average values are as follows : $$r_1(HEMA) : 6.62 $\pm$ 0.07, r_2(ATMS) : 0.07 $\pm$ 0.01 for HEMA-ATMS system.$$ $$r_l(HEMA) : 4.09 $\pm$ 0.14, r_2(ATMOS) : 0.06 $\pm$ 0.01 for HEMA-ATMOS toys tem.$$ The lower rl(HEMA) In the HEMA-ATMOS system as compared to HEMA ATMS system may be contributed to higher relative reactivity of ATMOS toward the poly(HEMA) radical. The compositions of synthesized copolymers were determined from silicon con tents estimated gravimetrically. The thermal stabilities of the copolymers were investigated by thermogravimetry(TG). The enthalpic changes associated with the endothermic transition were evaluated by differential scanning calorimetry(DSC). The swelling properties of the copolymers in water were also investigated.