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삼산지역을 대기질예측에 관한 연구 : 울산공단을 중심으로
백중현 忠南大學校 環境問題硏究所 1992 環境硏究 Vol.10 No.-
This study was performed to delineate the present air pollution level in the Samsan region of Ulsan, to investigate the environmental effects, and to find the measures of attaining the clean environmental in the Samsan region. The observed concentration of sulfur dioxide are 7.1∼43.8 ppb at all sites. These values are lower than those of the current air quality standards, 50 ppb. The data also shows that observed concentrations of hydrogen fluoride are 2.2∼4.4 ppb. The simulated concentrations of hydrogen fluoride in 1994 and 1995 belong to enforced environmental standard will be reduce to 0.3 and 0.13 times each than those of 1991.
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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.
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김환영,송해영,백중현 忠南大學校 産業技術硏究所 1990 산업기술연구논문집 Vol.5 No.2
Isotope between uranyl complexes in aqueous solution and ions in cation exchange resin was experimentally student. The uranium bands absorbed on exchange resin could be maintained during elution process. The isotope coefficients εof the uranyl complex system determined by a chromatographic method were (uranylchloride system), (0.88 ±0.1) ×10-⁴(glycolate), (1.42 ±0.15) ×10-⁴(lactate) and (2.18 ±0.2) ×10-⁴ at 25 ℃.
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Cu S 를 도입한 Acrylamidoxime-Vinyl phosphate 공중합체의 전기적 성질
백중현,송해영,박요한,서구원 忠南大學校 産業技術硏究所 1990 산업기술연구논문집 Vol.5 No.2
The AN-VP-Cu(Ⅱ) and A-AN-VP-Cu(Ⅱ) complexes were the most stable in the pH11. The morphology of Cu S-induced AN-VP, A-AN-VP had changed into compact form. The thermal stability Cu S-induced AN-VP, A-AN-VP had been determined by DSC measurement. As result, it had been observed that thermal stability for Cu S-induced AN-VP was stabilized more than that of Cu S-induced A-AN-VP. The Cu(Ⅱ) Complex exhibit surface resistivity about 40∼100Ωcm range when modified iodine in acetone. The electrical conductivity of Cu S-induced AN-VP and A-AN-VP were about 0.06∼0.3Ω-¹·Cm-¹ range.
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구리 이온을 도입한 PAN과 A-PAN의 도전성에 관한 연구
백중현,송해영,손원근,여창열 忠南大學校 産業技術硏究所 1990 산업기술연구논문집 Vol.5 No.2
The PAN-Cu(Ⅱ) and A-PAN-Cu(Ⅱ) complexes were the most stable in the pH 11. The morphology of CuxS-induced PAN, A-PAN had changed into compact form. 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 satisfactorily obtained by adding more than 20wt% of cupric chloride and about 3wt% iodine. The optimum conduction for the introducing of CuxS was at the CuSO₄concentration of 30g/ℓand the reaction time of 3hrs. The electrical conductivity of CuxS-induced PAN and A-PAN was higher by order of 10-⁴than of the Cu(Ⅱ)complex.
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방사선 전조사에 의한 PP Membrane에 대한 Acrylonitrile 그라프트 공중합체의 합성
황택성,백중현,주재오,맹기석 忠南大學校 産業技術硏究所 1990 산업기술연구논문집 Vol.5 No.1
A porous, graft copolymer and amidoxime group containing membrane were prepared by radiation graft copolymerization of acrylonitrile onto porous polypropylene. In order to calculate the grafting and amidoxime ratios of porous polypropylene-acrylonitrile graft copolymer. We have done CHN elemental analysis. It is obtained the result that grafting rate is increased to linear and value was about 75 percent at 20 Mrad dose rate.
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오건환,백중현,박병빈,류해일 공주대학교 사범대학 과학교육연구소 1998 과학교육연구 Vol.29 No.1
측쇄가 메틸, 페닐 혹은 이들이 혼합된 구조인 폴리 실란계 및 공중합체를 합성하고, 이들에 요오드를 도핑하여 폴리실란/I₂고분자들을 얻었다. 그들의 구조적, 열적, 전기적 특성을 분광학적 방법을 통하여 연구되어졌다. 열분석에 의하여 측쇄그룹이 메틸기에서 페닐기로 치환됨에 따라 열안정성이 증가함을 확인하였다. 요오드로 도핑된 고분자들은 도핑되지 않은 고분자들에 비하여 여러 단계의 열분해가 일어나며 잔기의 함량도 높았다. 전도도는 폴리실란에서는 ?? 범위의 값을 가지고, 도핑 폴리실란에서 ?? 범위의 값을, 공중합체에서는 ?? 값을 나타내었다. Polysilanes and copolymers which had side chains of methyl, phenyl, and mixed structures, were synthesized. The structural, thermal, and electrical characteristics of the polymers were systematically studied with spectroscopic methods. The thermal stabilities of the polymers were found to increase in polymers with phenyl substituents. The bathochromic shift of polysilanes with phenyl substituents relates probably to the narrowed band gap caused by delocalization of electron. The polymers were modified by doping process with iodine. The polymers doped with iodine showed multi-step pyrolysis behavior. The electric conductivities of the undoped and doped polysilanes were ?? and ??, respectively.
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