藥物性 肝疾患

朴斗昊,鄭煥國 대한의학협회 1976 대한의학협회지 Vol.19 No.7

로진 변성 불포화 폴리에스테르의 합성과 그 특성

강두환,윤동국 단국대학교 1998 論文集 Vol.32 No.-

Unsaturated diol(UD) was prepared by the esterification of maleic anhydride with diethylene glycol(DEG). Unsaturated polyester modified with rosin(UPMR) was prepared by the reaction of rosin maleic anhydride adduct(RMA) with UD. After Crosslinking UPMR with styrene and methylmethacrylate(MMA), solvent resistance, tensile strength, and adhesion property were measured. UPMR crosslinked with styrene or MMA shows an excellent resistance to water and acid. Solvents resistance and tensile strength for UPMR were more increased when styrene was used as crosslinking agent, because of the crosslinking density being increased. However, adhesion strength of UPMR crosslinked with styrene and MMA were 1.61 MPa and 3.02 MPa respectively.

Siloxane-Epoxy Copolymer의 合成과 熱的 性質에 관한 硏究 (Ⅰ)

姜斗煥,林惠蘭 단국대학교 1981 論文集 Vol.15 No.-

Oligosiloxane which has molecular weight 900∼1,000 was synthesized from OMCS, and bisphenol A epichlohroydrin polycondensate was synthesized from bisphenol A and epichlohroydrin. The oligosiloxane-epoxy copolymer was prepared through the copolymerization of oligosiloxane and epoxy prepolymer under alkaline acetone solution. The structures of oligomers, copolymer and Si contents to the copolymer were determined by infrared absorption spectra and elemental analysis, and Si content to copolymers was increased according to mole ratio of oligosiloxane to epoxy prepolymer increased. Thermal properties of copolymers and epoxy resin was measured by thermogravimetric analysis. Copolymer with 8.2% Si content had higher degradation temperature 250∼300℃ than epoxy resin which degradated at 80∼100℃, but the copolymer had poor solubility according to Si content increased.

표면처리 Aramid fiber강화 탄성체의 제조와 그 물성

강두환,여학규 단국대학교 1996 論文集 Vol.30 No.-

The surface of Kevlar fiber with high strength and modulus was treated by recting methacryloyl chloride, and then introduced unsaturated methacryloyl group on the surface. Rubber compound was prepared using the elastomeric gum dissolved in toluene with surface treated Kevlar fiber, and molded to prepare sheet at 140℃, 4MPa. The crosslinking density between Kevlar fiber and rubber matrix according to their interaction, the volume fraction of swollen rubber by solvent was measured from Kraus and Cunnen-Russel equation. In the compound of the rubber reinforced with untreated Kevlar fiber, the volume fraction of the compound was decreased after reaching swelling equilibrium because of low interaction between Kevlar filler and rub-ber. But in the case of treated Kevlar fiber with methacryloyl chloride, the volume fraction of the compound was increased, according to the increasing the amount of Kevlar filler added. From this phenomena it was concluded that the crosslinking between surface treated Kevlar and rubber was increased. Tensile strength of the sheet prepared using rubber compound reinforced with the surface treated Kevlar was increased twice, compared with the untreated Kevlar filled compound.

感光性樹脂에 관한 硏究 : Naphthoquinone-1,2-diazide-5-5-sulfonamide의 合成 Synthesis of Naphthoquinone-1,2-Diazide-5-5-Sulfonamide

姜斗煥 단국대학교 1976 論文集 Vol.10 No.-

Polymer with photosensitive functional group of quinonediazide, the naphthoquinone-1,2-diazide-5-sulfonamide (PAAND) of polyacryl amide (PAA) was prepared. PAA was polymerized by redox system using ferrous ammonium sulfate-hydrogen peroxide initiator. And also, PAAND was prepared by condensation of PAA with naphthoquinone-1,2-diazide-5-sulfonyl chloride, and the replacement of such a functional group was confirmed by the infrared absorption spectrum and elemental analyses. The good agreement between the observed values of elemental analyes and the calculated values for PAAND, indicated that the degree of polymerization did not change in the course of condensation of PAA with NDSC.

難燃性 軟質 Polyurethane Foam의 製造에 관한 硏究

姜斗煥,金奎權 단국대학교 대학원 1984 學術論叢 Vol.8 No.-

Falme retardant polyurethane foam was prepared by foaming mixed polyether polyol which has different OH value, such as OH No. 56,560,840, etc. with TDI, and added various retard agent to the compounds mixture. As the result of the mechanical and flammability test of the foam, tensile strength and tear resistance were decreased, and compressive strength and flame retardancy were a little increased, as the amount of polyether polyol with higher OH value was incre­ased. The flame retardant agent such as tricresyl phosphate (TCP), Tri (β­chloro ethyl) phosphate(TCEP), PHT_4-diol (PHT_4) and Sb_2O_3 was added to the compounds foaming, and the flammability and the mechanical properties of the foams were measured. As the result of the mechanical and flammability test of the foam increased the various the result of the mechanical and flammability test of the foam increased the various retardant agenciesy, the flammability resuet showed better in the order of PHT_4 TCEP, TCP, and Sb_2O_3, and the mechanical properties were similar to the result in case of the foam prepared with mixed polyether polyol having different OH value with TDI.

錦江流域 淡水魚의 Sparganum에 關한 調査硏究

辛大煥,羅榮彦,權斗星 충남대학교 의과대학 지역사회의학연구소 1987 충남의대잡지 Vol.14 No.1

Prevalence of the plerocercoid larva in the fresh-water fishes in Keum-river basin was surveyed from April to September, 1986. To observe whether this plerocercoid larva is really sparganum or not, and can be transfered to the paratenic host or not, a study was performed with the adequate experimental animal (domestic fowl and cat). It was collected the 1096 fresh-water fishes that was ranged 8.0^-16.0cm in length. The results obtained were as follows; 1. A number of ova of Diphyllobothrium spp, was confirmed under the microscopic study, 5 days after experimental infection through the mouth, and them sacrificed to the experimental animal (final host, cat). The adult worm of Diphylobothrium spp., 9.5cm in length, was obtained and that worm was located in the upper position of rectum, Therefore, this plerocercoid larva was confirmed as Sparganum. 2. Transference to the paratenic host (dowestic fowl) was not resulted. 3. Among the total number of 1096 fresh-water fishes, only the Z. platypus was infected with 107 worms corresonding to 9.8%. 4. Infection rate according to the length of Z. platypus was 66. 4% at 12-13. 9cm in length, and this percentage was the highest prevalent rate.

小兒急性 腦膜炎의 臨床的 觀察

鄭英桓,方斗憲,李瑾洙 金原出版 1970 小兒科 Vol.11 No.6

Polydimethylsiloxane-Polyurethane Zwitterionomer의 합성과 그 특성에 관한 연구

姜斗煥,吳炳昌 단국대학교 1995 論文集 Vol.29 No.-

Polydimethylsiloxane-polyurethane zwitterionomer was prepared by ionizing polyester type polydimethylsiloxane-polyurethane copolymer containing tertiary amine with 1, 3-propane sultone. Unsaturated polyester type polydimethylsiloxane-polyurethane copolymer containing tertiary amine was prepared by reacting unsaturated polyester type polydimethylsiloxane polyol with MDI, and then chain extended with N-methyldiethanol amine. Mechanical properties of polydimethylsiloxane-polyurethane copolymer and polydimethylsiloxane-polyurethane zwitterionomer were measured. The mechanical properties of Polydimethylsiloxane-polyurethane zwitterionomer, Young's modulus increased from 5MPa to 14MPa, tensile strength increased from 3.4MPa to 7.1MPa, while elongation decreased from 115% to 97% because of the increase of bond energy in the hard domains and crystallinity by ionization.

Siloxane-Polyester공중합물의 합성과 그 열적 특성에 관한 연구

姜斗煥,梁在乾,金晟範 단국대학교 1983 論文集 Vol.17 No.-

High molecular weight block copolymer having the structure [(CH_3)_2SiO]_n[O?COO?O]_m prepared from the copolymerization of chloride end blocked polydimethylsiloxane and hydroquinone p-hydroxybenzoate. Siloxane sequence was controlled by employing chloride ended polydimethylsiloxane of diffrent degrees of polymerization. As a result, copolymers ranging in composition from 16% of 58wt% siloxane sequence were synthesized and characterized by IR, NMR, DSC, and TG. Thermal properties of copolymer with 25wt% siloxane unit had the higher thermal degradation temperature, 650∼700℃ than polydimethylsiloxane which degradate at 300∼350℃, but the copolymer had poor solubility.