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RISS 인기검색어
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- 저자 : 구수진 ( Su Jin Gu ) (검색결과 6 건)
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콜레스테릴기와 아조벤젠기를 갖는 곁사슬 액정고분자의 합성 및 성질
구수진 ( Su-jin Gu ),조국영 ( Kuk Young Cho ),방문수 ( Moon-soo Bang ) 한국공업화학회 2019 공업화학 Vol.30 No.2
메소젠기로서 다양한 조성의 아조벤젠기와 콜레스테릴기를 갖는 곁사슬 액정고분자를 직접중축합에 의해 합성하고 고분자들의 특성을 조사하였다. 1,1,2,2-테트라클로로에테인으로 측정된 합성된 고분자들의 고유점성도는 0.32과 0.38 dL/g 사이의 값을 나타냈다. 아조벤젠기만을 포함하고 있는 고분자, SP-A10C0를 제외한 모든 고분자들은 부피가 큰 곁사슬의 메소젠기로 인하여 무정형이거나 매우 낮은 결정성을 나타냈다. 합성된 고분자들은 모두 양방성 액정성을 보였으며, 아조벤젠기만을 갖는 고분자 SP-A10C0는 네마틱상을, 그 외의 모든 고분자들은 콜레스테릭상을 나타냈다. 특히, 고분자의 곁사슬로 콜레스테릴기의 함량이 많아지면 콜레스테릴기의 큰 부피로 인하여 액정성이 감소됨을 알 수 있었다. Side-chain liquid crystalline polymers with various compositions of azobenzene and cholesteryl functional groups as the mesogenic moiety were synthesized by direct polycondensation, and their properties were investigated. The inherent viscosity values of synthesized polymers were between 0.32 and 0.38 dL/g in 1,1,2,2-tetrachloroethane. All polymers except the SP-A10C0 polymer containing only the azobenzene group were amorphous or exhibited very low crystallinity due to the presence of bulky mesogenic side chains. All synthesized polymers exhibited enantiotropic liquid crystallinity; the SP-A10C0 polymer having only the azobenzene group exhibited a nematic phase, and all other polymers showed a cholesteric phase. In particular, it was found that when the content of cholesteryl groups in the side chain of the polymer increases, the liquid crystallinity decreases due to the bulkiness of cholesteryl groups.
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아이소소바이드기를 갖는 콜레스테릭 액정고분자의 합성 및 성질
구수진 ( Su-jin Gu ),윤두수 ( Doo-soo Yoon ),방문수 ( Moon-soo Bang ) 한국공업화학회 2017 공업화학 Vol.28 No.2
본 연구에서는 콜레스테릭 액정상 유도를 위하여 아이소소바이드기를 가지고 있으며, 액정상 전이온도의 조절을 위하여 메틸렌기를 포함하고 있는 액정고분자들을 합성하였고, 합성된 액정고분자 내의 아이소소바이드기의 함량과 메틸렌기의 위치가 액정고분자의 물성에 미치는 영향이 조사되었다. 합성된 모든 고분자들 중, 주사슬에 메틸렌 유연격자를 가진 고분자(MnHI-x)가 곁사슬에 메틸렌 유연격자를 가진 고분자(SnBI-x)들보다 더 높은 용융전이온도와 열안정성을 나타내었다. 합성된 모든 고분자들은 양방성 액정상을 나타냈으며, 콜레스테릭 액정상 유도체로써 아이소소바이드 함량이 10몰%인 고분자는 네마틱상을, 20몰% 이상의 고분자들은 콜레스테릭 액정상 또는 카이랄 스멕틱상을 형성하였다. 이로써, 아이소소바이드기가 콜레스테릭 액정상 유도체로써의 역할을 하였음을 알 수 있다. We synthesized liquid crystalline polymers containing isosorbide group as a cholesteric derivative and methylene group for controlling the transition temperature to the liquid crystal phase. Effects of the concentration of the isosorbide group and the position of the methylene group on the properties of the liquid crystalline polymer were investigated. Among all the synthesized polymers, polymers (MnHI-x) with a methylene group in the main chain showed higher melting transition temperature and thermal stability than those (SnBI-x) with a methylene group in the side chain. All the synthesized polymers showed an enantiotropic liquid crystal phase. The polymers having 10 mol% isosorbide as a cholesteric liquid crystal phase derivative showed nematic phase, and those having 20 mol% or more isosorbide showed a cholesteric or chiral smectic phase. Thus, we can conclude that the isosorbide group plays a role as a cholesteric liquid crystal phase derivative.
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말단에 치환기를 갖는 이-아조메소젠 액정화합물의 합성 및 성질
박종률 ( Jong Ryul Park ),구수진 ( Su Jin Gu ),윤두수 ( Doo Soo Yoon ),방문수 ( Moon Soo Bang ),최재곤 ( Jae Kon Choi ) 한국공업화학회 2015 공업화학 Vol.26 No.6
Two series of symmetric dimesogenic compounds containing a butylene or 1-methylbutylene spacer as a flexible group were synthesized. The mesogenic groups of synthesized compounds consist of an azobenzene group with a terminal substituent. Chemical structures as well as, thermal, mesomorphic, and photochemical properties of the synthesized compounds were investigated using FT-IR, 1H-NMR, differential scanning calorimetry (DSC), polarizing optical microscopy (POM), and UV-visible spectrometry. P-H, P-F, and P-OC6H13 showed monotropic liquid crystal phases, whereas the others showed enantiotropic liquid crystal phases. Compounds with butylene group as a flexible spacer exhibited wider mesophase temperature ranges and higher thermal transition temperatures than compounds containing a 1-methylbutylene group. Compounds with a high absolute value of the Hammett substituent constant exhibited high thermal transition temperatures and improved stability in the liquid crystal phase. Furthermore, in the absence or presence of UV light illumination, terminal substituents of the azomesogenic group were important factors in deciding the maximum absorbance wavelength (λmax) and the rate of photoisomerization (K).
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수열합성법에 의한 광촉매 제조 및 Brilliant Blue FCF 분해 성능
김석현 ( Seok-hyeon Kim ),정상구 ( Sang-gu Jeong ),나석은 ( Seok-en Na ),구수진 ( Su-jin Koo ),주창식 ( Chang-sik Ju ) 한국화학공학회 2016 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.54 No.2
Experimental research on the preparation of photocatalyst for the decomposition of brilliant blue FCF(C_{37} H_{31} O_{9}N₂S₃Na₂) was performed. TiO₂ and ZnO powders were prepared from titanium (IV) sulfate and zinc acetate at low reaction temperature and atmospheric pressure by hydrothermal precipitation method without calcination. In addition, TiO₂ was prepared with cationic surfactant CTAB (Hexadecyltrimethyl ammonium bromide) at the same conditions. The physical properties of prepared TiO₂ and ZnO, such as crystallinity, average particle size and absorbance, were investigated by XRD, Zeta-potential meter and DRS. And, the photocatalytic degradation of brilliant blue FCF has been studied in the batch reactor under UV radiation. For the photocatalysts prepared without CTAB, TiO₂ has smaller particle size and larger absorbance and photocatalytic reaction rate than ZnO. And TiO₂, prepared with CTAB whose concentration is 1/10 of that of precursor, shows 15% higher than that prepared without CTAB in final photocatalytic degradation ratio of brilliant blue FCF.
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TTA와 TOPO를 이용한 수용액 중의 리튬이온 용매추출
주창식 ( Chang Sik Ju ),이전규 ( Jeon Kyu Lee ),정상구 ( Sang Gu Jeong ),구수진 ( Su Jin Koo ),김시영SiYoungKim 한국화학공학회 2013 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.51 No.1
For the purpose of development of the extraction process of lithium ion from concentrated water eliminated from desalination process, an experimental research on the solvent extraction of lithium ion from aqueous solutions was performed. The effects of operating parameters, such as concentration of extractant, ratio of extracting solution/aqueous solution, pH of aqueous solution, were examined. The effect of sodium chloride, the major component of sea water, was also examined. Lithium ion in aqueous solutions of pH=10.2~10.6 adjusted by ammonia solution was most effectively extracted by extracting solution composed of 0.02 M TTA and 0.04 M TOPO in kerosine. The addition of sodium chloride in lithium aqueous solution significantly interfered the extraction of lithium ion.
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