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Porous Sulfonated Styrene-Divinylbenzene Copolymer Ionexchanger 에 의한 리튬 동위원소의 분리
김동원,맹기석,송해영,류해일,Dong Won Kim,Ki Suck Maeng,Hae Young Song,Hae Il Ryu 대한화학회 1983 대한화학회지 Vol.27 No.3
리튬동위원소의 분리 실험이 염산과 양이온 교환 수지를 사용하여 행하여졌다. 이 실험에서는 porous sulfonated styrene-divinylbenzene copolymer와 Dowex 50w-x8의 양이온 교환수지가 사용되었다. 리튬의 양은 원자 흡광 분석기를 사용하여 측정되었다. 리튬 동위 원소의 상대적 질량은 질량 분석기로 측정하였다. 동위 원소의 분리인자는 분별된 용출액의 동위 원소 조성으로 부터 계산되었다. 분리 인자의 값은 염산과 porous sulfonated styrene-divinylbenzene copolymer system에서 1.0020이었고, 염산과 Dowex 50w-x8 system에서 1.0011${\om}$0.0002이었다. 이와 같은 결과로부터 우리들은 분리 인자의 값이 Dowex 50w-x8에서 보다 porous sulfonated styrene-divinylbenzene copolymer에서 더 크게 나타남을 알 수 있었다. The lithium isotopes separation experiments were carried out in hydrochloric acid with cation exchanger systerns. In these experiments were employed porous sulfonated styrene-divinylbenzene copolymer and Dowex 50w-x8 as cation exchanger. The contents of lithium of the fraction were determined with atomic absorption spectrophotometer. The relative mass of lithium isotopes of the fractions was analyzed on a mass spectrometer. The isotope separation factors of lithium were calculated from the isotope compositions of these eluted fractions. Separation factor for the system in hydrochloric acid and porous sulfonated styrene-divinylbenzene copolymer was found to be 1.0020, and for the case of system in hydrochloric acid and Dowex 50w-x8 was 1.0011${\om}$0.0002. From these results, we found that the separation factor for porous sulfonated styrene-divinylbenzene copolymer ionexchanger is larger than value of Dowex 50w-x8 ionexchanger.
Polyacrylonitrile-Cu(Ⅱ) Complex의 형성과 촉매활성 및 전기전도성에 관한 연구
송해영,김동철,맹기석,이신영 忠南大學校 産業技術硏究所 1987 산업기술연구논문집 Vol.2 No.1
The PAN-Cu (Ⅱ) and Al(Ⅲ) complexes were most stable in the pH range from 9 to 11. The viscosity of the PAN-Cu (Ⅱ) complex was lower than that of PAN-Al(Ⅲ)complex because the conformation of the former is more compact than that of latter. The catalytic activity of PAN-Cu (Ⅱ) complex in decomposition of hydrogen peroxide was increased with an increase of complex concentration and reaction time. The PAN-Cu (Ⅱ) complex exhibited electrical resistivity around 10⁴Ω·cm when modified iodine in acetone. The electrical resistivity was significantly affected by the amount of added cupric chloride, iodine and results were satisfactorily obtained by adding more than 20wt % of cupric chloride and about 1.0wt% iodine.
구리이온을 도입한 Acrylonitrile-Acrylic Acid계 공중합체의 도전성에 관한 연구
손원근,맹기석,김동철,송해영 忠南大學校 産業技術硏究所 1987 산업기술연구논문집 Vol.2 No.2
The AN-AA copolymer-Cu(Ⅱ) and Amidated AN-AA copolymer-Cu(Ⅱ) complex were the most stable in the pH range of 9. The morphology of Cu(Ⅱ) complex and CuxS-induced had changed into compact form. The thermal stability for Cu(Ⅱ) complex and CuxS-induced had been determined through DTA and TGA measurement. As result, it has been observed that thermal stability for Cu(Ⅱ) complex were stabilized less than that of copolymer. The Cu(Ⅱ) complex exhibited surface resistivity around 10Ω㎝ when modified iodine in acetone. The resistivity was significantly affected by the amounts of added cupric chloride, iodine and results were statisfactorily obtained by adding more than 20wt% of Cupric chloride and about 1.0wt% iodine. The optimum condition for the introducing of CuxS was at the CuSO₄concentration of 30g/ℓ and the reaction time of 3hrs. The CuxS-induced electrical conductivity of copolymer was higher by order of 10 than that of the Cu(Ⅱ) complex.
PPG와 MDI를 이용한 Polyurethane Ionomer의 합성과 전기전도성에 관한 연구
맹기석,송해영,김동철,백중현 忠南大學校 産業技術硏究所 1988 산업기술연구논문집 Vol.3 No.1
Hydroxyl-terminated polyether polyurethanes based on 4,4′-diphenyldiisocyanate(MDI), N-methyldiethanolamine(MDEA) and polypropylene glycol-2,000(PPG) were synthesized with constant level of hard segment. The tertiaryamine of MDEA was sulfonated with r-propane sultone thereby converting the polyether polyurethane to a polymeric Zwitterion. Electrically conducting polyurethane ionomer film was prepared by introducing copper sulfate. The CuxS-induced electrical conducting of polyurethane ionomer film was higher by order 10⁴ than that of the original film. The morphology of CuxS-induced PU, PUI film surface was investigated with SEM.