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RISS 인기검색어
- 검색키워드
- 저자 : Won Jei Cho ) (검색결과 115 건)
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Styrene과 Allyl acrylate와의 放射線共重合에 關한 硏究
趙元濟,李億石 부산대학교 1973 論文集 Vol.15 No.2
The thermal copolymerization of styrene with ally acrylate was carried out in the presence of AIBN at 65℃. The radiation-induced copolymerization of styrene with allyl acrylate was carried out by the Co-60-γ-ray irradiation. The conversion percent of thermal and radiation-induced copolymerization was rapidly decreased to 0.4 mole fraction of styrene in the monomer mixtures but was not nearly changed from 0.4 to 0.7. The I.R. spectrum of styrene-ally acrylate copolymer was observed at 1730~1715cm^(-1) and 800~600cm^(-1). Intrinsic viscosity of thermal and radiation induced copolymerization was rapidly decreased to 0.6 mole fraction of styrene in the monomer mixture but was not nearly changed from 0.6 to 0.8.
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Styrene과 Allyl methacrylate와의 共重合에 關한 硏究
趙元濟,文正大,閔泰益 부산대학교 1972 論文集 Vol.14 No.2
The copolymerization of allyl compound, beginning with copolymerization of allyl acetate with vinyl acetate and so on, have already been reported by some researchers. There are not so many quantitative researches on copolymerization of allyl methacrylate with various monomer. Allyl methacrylate have two unsaturated double bond having polymerizability in molecule so that it is expected that its copolymer with vinyl compounds will be various properties and uses. In this paper, the copolymerization of styrene with allyl methacrylate were carried out in the presence of AIBN as initiator at 60℃ studied in its copolymerization conversion percent, intrinsic viscosity, softening point, monomer reactivity ratio, and also discussed I. R. spectrum of stryrene of stryrene allyl methacrylate copolymer.
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Poly (1-(2-Carbomethoxyacryloyl)-5-Fluorouracil)의 Drosophila 대사과정에 미치는 생리유전학적 영향에 관한 연구
李元鎬,金益成,趙元濟 부산대학교 환경문제 연구소 1985 環境硏究報 Vol.3 No.-
Genetic study on 5-fluorouracil(5-FU), 1-(2-carbomethoxyacryloyl)-5-fluorouracil(CMA-FU) and poly(CMAFU) treated in Drosophila melanogaster was undertaken by the adult feeding method of Lewis and Bacher. Toxic capacity, sex ratio, egg to adult viability, required developmental period, fecundity, and productivity induced by 5-FU, CMAFU, and poly(CMAU) had been analyzed. The results obtained were as follows: 1) The order of toxicity was decreased by 5-FU, CMAU, poly(CMAU) and control group. But there was no change by varying concentration. 2) The effects on the sex-chromosome were regarded by the sex ratio:In the control, sex ratio was 0.5349, in experimental groupⅠ treated with 5-FU 0.5862, in the groupⅡtreated with CMAFU 0.5747, and in the groupⅢ treated with poly (CMAFU) 0.5758, respectively. The differences between control and experimental groups were not significant. 3) The egg to adult viability of OR females was 86 percent in the control group, 0 in the experimental groupⅠ, 60 percent in the experimental groupⅡ, and 65 percent in the experimental groupⅢ. 4) The reguired developmental periods were calculated to be 9.43 days in the control group, 0 in the experimental groupⅠ,13.29 days in the group Ⅱ, and 13.23 days in the group Ⅲ. 5) The fecundities appeared from the first to the fifth culture were 16 eggs in the control group,12 in the experimental group Ⅰ,Ⅱ, and 13 in the groupⅢ, respecively. 6) The productivities were calculated to be 178 in the control, 0 in the experimental groupⅠ, 152 in the groupⅡ, and 186 in the groupⅢ. 7) It is found that a physiological genetic effect on the Drosophila melanogaster is much weaker for CMAFU and poly (CMAFU) than for 5 FU.
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폴리메틸비닐케톤 및 메틸비닐케톤을 포함하는 공중합체들의 합성과 물성에 관한 연구
김영민,오상훈,조원제 부산대학교 공과대학 1987 硏究報告 Vol.34 No.-
The homopolymerization of methyl vinyl ketone was carried out with AIBN as an intiator in benzene under various conditions. From the result of kinetic investigation of methyl vinyl ketone, a rate equation was obtained. d[M] -------- = k_(p)[M][I]½ dt The overall activation energy for the polymerization was found to be 7Kcal/mole. Molecular weights of poly (methyl vinyl ketone) were measured by the Cannon-Fenske viscometer and GPC. Plot of intrinsic viscosity [η] versus Mw on a double logarithmic graph indicated the following equation [η]=77×10^(-5)Mw^(0.72) Poly (acetyl acetylene) was obtained by the reaction of poly (methyl vinyl ketone) with phosphorus oxychloride in chloroform at 0℃ under various reaction time. The radical copolymerizations of methyl vinyl ketone(MVK) with methyl methacrylate(MMA) and methyl acrylate (MA) were carried out with AIBN as an initiator at 50℃ in bulk. The specific extinction coefficients on poly(MVK-co-MMA) and poly (MVK-co-MA) were measured by means of UV spectrophotometer at 288nm in THF. From the calibration curves obtained by the different concentration ratios of each homopolymers, the following equations were derived. ε=0.0153+5.99×10^(-3)χ for poly (MVK-co-MMA) ε=0.112+1.102 χ for poly (MVK-co-MA) where ε is the specific extinction coefficient of the copolymer and χ is the weight fraction of MVK unit in the copolymer. The following monomer reactivity ratios were determined. r₁(MVK)=0.5 and r_(2)(MMA)=0.95 for poly (MVK-co-MMA) r₁(MVK)=1.85 and r_(2)(MA)=0.99 for poly (MVK-co-MA) From DSC thermal analysis, glass transition temperature (T_(g)) of PMVK and PMMA are 307˚K and 386˚K, respectively. The glass transition temperatures of copolymers were increased with increasing MMA component in copolymer. The conductivity of poly (acetyl acetylene) increased from 10^(-6) Ω^(-1) cm^(-1) to 10^(-4) Ω^(-1) cm^(-1) with increasing the reaction time of poly (methyl vinyl ketone) and phosphorus oxychloride. In the reaction of poly (MVK-co-MA) with phosphorus oxychloride in chloroform at 0℃, the conductivity of the obtained copolymer was 10^(-6) Ω^(-1) cm^(-1).
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Study on the Blend of Polymethacrylates with Vinyl Chloride-Vinylidene Chloride Copolymer
Cho, Won Jei,R. E. PRUD'HOMME 부산대학교 공과대학 1985 硏究報告 Vol.30 No.-
폴리메틸메타아크릴레이트, 폴리에틸메타아크릴레이트, 폴리n-프로필메타아크릴레이트, 폴리글리시딜메타아크릴레이트, 폴리히드록시프로필메타아크릴레이트, 폴리이소프로필메타아크릴레이트, 폴리n-부틸메타아크릴레이트, 폴리이소부틸메타아크릴레이트, 폴리t-부틸메타아크릴레이트, 폴리n-아밀메타아크릴레이트, 폴리n-헥실메타아크릴레이트, 폴리시클로헥실메타아크릴레이트, 폴리페닐메타아크릴레이트와 비닐클로라이드와 비닐리덴클로라이드의 공중합체 [P(VC-VCl₂)]와의 블랜드에 대한 상용성을 시차주사열량분석을 이용해서 측정하였다. 폴리메틸메타아크릴레이트, 폴리에틸메타아크릴레이트, 폴리n-프로필메타아크릴레이트, 폴리이소프로필메타아크릴레이트, 폴리n-부틸메타아크릴레이트, 폴리이소부틸메타아크릴레이트, 폴리s-부틸메타아크릴레이트, 폴리n-아밀메타아크릴레이트, 폴리n-헥실메타아크릴레이트, 폴리시클로헥실메타아크릴레이트, 폴리페닐메타아크릴레이트와 P(VC-VCl₂)와의 블랜드는 상응하는 단일중합체의 T_(g)값들 사이의 중간치의 온도에서 단일 Tg값을 가지기 때문에 이들 블랜드가 상용한다는 것을 알았다. 폴리글리시딜메타아크릴레이트, 폴리히드록시프로필메타아크릴레이트, 폴리t-부틸메타아크릴레이트와 P(VC-VCl₂)와의 블랜드는 상응하는 단일중합체들의 T_(g)값에 가까운 2개의 T_(g)값들을 나타내었으며, 이들 블랜드들은 상용하지 않았다. 폴리페닐메타아크릴레이트와 P(VC-VCl₂)의 블랜드에 관한 결정응점강하 자료치로부터 열역학적 상호작용 파라미터 x_(12)는 -0.41과 같다는 것을 알았다. 폴리메타아크릴레이트들과 P(VC-VCl₂)와의 블랜드에서 폴리메타아크릴레이트의 상용성은 폴리메타아크릴레이트의 치환기의 극성효과보다 입체효과에 더 의존한다.
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