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RISS 인기검색어
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- 저자 : 명영찬(Young Chan Myoung) (검색결과 4 건)
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Calix[4]arene 계의 PS 판용 NQD 에스테르의 합성 및 감광 특성
명영찬(Young Chan Myoung),최현호(Hyun Ho Choi),구양서(Yang Seo Ku),안종일(Chong Il Ahn),정기원(Gee Won Chung),이정복(Jung Bok Lee) 한국공업화학회 2002 공업화학 Vol.13 No.2
본 연구는 ballast로서 calix[4]resorcinarene (C4-R4)과 calix[4]pyrogallene (C4-PA) 유도체를 합성한 후 naphthoquinone-(1,2)-diazide-5-sulfonic acid esters (NQD-ester)를 2-diazo-naphthoquinone-5-sulfonyl chloride (NQD-Cl)과의 에스테르화 과정을 통해 pre-sensitized offset printing plates (PS 판)에 쉽게 적용할 수 있는 포지티브형의 감광제를 합성하여 비교·고찰하였다. C4-RA 유도체는 resorcinol과 pyrogallol을 각각 아세트알데히드와의 축합 반응으로 합성하였다. C4-RA 유도체는 극성 용매와 수용성 염기에 매우 좋은 용해도를 가지며 또한 노블락 수지와 비슷한 광학적 성질를 가진다. C4-RA 유도체를 NQD-Cl과 부분적인 에스테르화하여 치환율이 각각 다른 NQD-ester 유도체를 합성하였다. 남아 있는 hydroxy group은 유기 용매에 대한 용해도를 좋게 해주었다. 각각의 NQD-ester 유도체들을 노블락 수지와 배합하여 PS판을 제조하였다. 용해도,열적 안정성, 감광성, 적합한 노광시간과 상대 감도를 각각 용해도 측정, TGA, UV spectrophotometry, UV lithographic method와 gray scale method를 사용하여 측정하였다. C4-RA 유도체를 ballast로 하여 합성한 NQD-ester 유도체는 적합한 용해도와 감광 특성을 보여주었으며 최적화된 lithographic 조건을 측정하여 이를 사용해 포지티브 이미지를 얻을 수 있었다. In this study, light sensitive naphthoquinone-(1,2)-diazide-5-sulfonic acid esters (NQD-ester) based on calix[4]resorcinarene (C4-RA) and calix[4]pyrogallene (C4-PA) derivatives, were used as a ballast. They were suitable for the positive working photoactive compounds in the use of pre-sensitized offset printing plates (PS plates). C4-RA derivatives were synthesized from resorcinol, pyrogallol, and acetaldehyde by the condensation reaction. C4-RA derivatives had a good solubility in highly polar solvents and aqueous alkaline bases, and their optical properties were similar to those of novolac resin. Synthesized C4-RA derivatives were partially esterified with 2-diazo-naphthoquinone-5-sulfonyl chloride (NQD-Cl) to give several NQD-esters. The hydroxyl groups left provided good solubility in the organic solvents. Each of NQD-ester was formulated with novolac base resin, and PS plates were manufactured. Solubility, thermal stability, photosensitivity, compatible exposed time, and relative sensitivity were determined by solubility test, TGA, UV spectrophotometry, imaged by UV lithographic techniques, and gray scale method, respectively, NQD-ester derivatives, which is synthesized with C4-RA derivatives, gave suitable solubilities and photochemical properties. We found the optimal lithographic properties, and obtained good images for PS plates.
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Itraconazole 중간체의 효율적 합성법과 그 유사체의 합성
안종일,명영찬,최하영,김승진,Ahn, Chong Il,Myoung, Young Chan,Choi, Ha Young,Kim, Seung Jin 대한화학회 1999 대한화학회지 Vol.43 No.6
Itraconazole is an important drug for oral treatment of histoplasmosis and blastomycosis. ltraconazole has been the targets of many synthetic efforts due to their diverse antifungal activities. ln this study, an efficient synthetic route for Itraconazole intermediates has been developed using new procedures. Also, ltraconazole analogues introducing 2- and 3-methoxy group instead of ltraconazole intermediates with 4-methoxy group were synthesized. Itraconazole은 다양한 항진균 활성을 가지고 있는 매우 중요한 화합물로써 histoplasmosis, blastomysosis의 경구용 항진균 치료제로 매우 중요하다. 본 연구에서는 Itraconazole 중간체 합성에 있어서 합성과정을 개선하고, 또 ltraconazole 중간체의 4-위치의 methoxy기 대신 2-, 3- 위치에 methoxy기를 가진중간체 화합물을 합성하고 이로부터 Itraconazole 유사체도 합성할 수 있었다.
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IEC 62321 국제표준화의 Projector Leader 수임에 의한 국가 경쟁력 강화
김재우(Kim Jae Woo),정재학(Jung Jaehak),이성익(Lee Seong-Ik),최은경(Choe Eun Kyung),명영찬(Myoung Young Chan),정남용(Cheong Nam-Yong) 표준인증안전학회 2012 표준인증안전학회지 Vol.2 No.2
Many electrical and electronic companies are realizing that they need to be able to identify materials containing hazardous substances. Thus, TC 111 working group 3 that developed test methods of hazardous substances was organized in the IEC. Korea has contributed to WG 3 by dispatching around 10 Korean experts since 2008. Particularly, NWIP(New Work Item Proposal) on the test method of phthalates that has been recently an issue in the international environmental regulation was proposed by Korean experts of WG 3 and approved officially by IEC TC 111 WG 3. As such the standardization of phthalates is now in progress and is expected to be published officially as international standard, IEC 62321-8 in 2015. Another successful example where Korean expert took on responsibility as a project leader is standardization of IEC 62321-3-2 by developing screening method for total bromine. In this paper, detailed processes of standardization of IEC62321-3-2 and IEC62321-8 under Korea s leadership will be reported with resulting positive effects of Korea national committee s aggressive participation in international standardization.
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