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CdS 콜로이드 양자점 물질의 합성과 반응물질 비율에 따른 스펙트럼 변화 연구
임권택 ( Kwon Taek Lim ),정연태 ( Yeon-tae Jeong ),허훈 ( Hoon Heo ) 한국화상학회 2016 한국화상학회지 Vol.22 No.1
CdS colloidal quantum dots are prepared with different reactant ratio of CdO and Sulfur. Under the ratio of 1:3 molar amounts, there was no difference on the absorption and photoluminescence spectra, which means that similar size(~3.6nm) of quantum dots formed with no regard to the reactant ratios. However, at the ratio of 1:9 we could not observe a meaningful absorption spectra. It also showed very different PL spectra, which implies the formation of different materials.
임권택 ( Kwon Taek Lim ),허훈 ( Hoon Heo ) 한국화상학회 2015 한국화상학회지 Vol.21 No.3
Gloss values were measured for C, M, Y, and K color printed samples with a commercial glossmeter operated at fixed angles of 20, 60 and 85 degrees. The results were compared with maximum values and functional areas of BDRF obtained by using a gonio glossmeter. High degree gloss values showed better correlation with BDRF maximum height measurement though the values were very low for these uncoated printed samples. After fusing process with an iron of hight temperature for a second, 20 degree gloss values showed a similar trend to the BDRF maximum heights while 85 degree glosses were in the closest agreement with the BDRF areas.
폴리디메틸실록산계 안정화제를 이용한 초임계 이산화탄소에서의 ?-Lactide의 개환중합
황하수,임권택,Hwang, Ha Soo,Lim, Kwon Taek 한국청정기술학회 2006 청정기술 Vol.12 No.2
다양한 폴리디메틸실록산계 공중합체를 안정화제로 이용하여 초임계 이산화탄소 내에서의 개환중합을 통해 PLLA를 제조하였다. 초임계 개환중합에 사용된 폴리디메틸실록산 공중합체는 폴리디메틸실록산 거대개시제를 사용하여 그룹전이중합법(GTP법)을 이용하여 제조하였다. $\small{L}$-락타이드의 초임계 현탁중합을 통해 수미크론크기의 입자가 형성되었음을 전자 주사 현미경을 통해 확인하였고, 또한 겔 투과 크로마토 그라피 분석을 통해 상당히 좁은 분자량 분포의 PLLA가 제조되었음을 확인하였다. Poly($\small{L}$-Lactide)(PLLA) was prepared by a ring-opening polymerization of $\small{L}$-Lactide with various polydimethylsiloxane(PDMS) based copolymers as a stabilizer in supercritical carbon dioxide($scCO_2$). The block copolymeric stabilizers were synthesized by group transfer polymerization (GTP) by using PDMS macroinitiator. PLLA was found to be produced with fairly low molecular weight distribution as confirmed by gel permeation chromatography(GPC) analysis. Scanning electron microscopy (SEM) results showed that sub-micron size Poly($\small{L}$-lactide)(PLLA) particles were formed by suspension polymerization.
고분자형 산 증식제에 기초한 새로운 포토레지스트의 연구
이은주,정용석,임권택,정연태,Lee, Eun-Ju,Jeong, Yong-Seok,Lim, Kwon-Taek,Jeong, Yeon-Tae 대한화학회 2004 대한화학회지 Vol.48 No.1
산에 민감한 작용기를 갖는 tert-butyl methacrylate(tBMA)와 산 증식 기능을 갖는 4-hydroxy-4''p-styrenesulfonyloxyisopropylidene dicyclohexane(HSI)과 4-p-styrenesulfonyloxy-4''-tosyloxyisopropylidene dicyclohexane (STI)를 둘 다 함께 갖고 있는 공중합체를 새로운 고분자 산증식형 포토레지스트로 합성하였다. 산증식형 공중합체인 Poly(HSI-co-tBMA) film과 Poly(STI-co-tBMA) film은 산의 부재 시에는 레지스트 공정 온도에 대하여 충분한 열적 안정성을 나타내었다. Poly(STI-co-tBMA) film의 감도는 tBMA homopolymer에 비교하여 2배 정도 증진되었지만, Poly(HSI-co-tBMA) film은 오히려 2배 정도 감도가 저하되는 결과를 나타내었다. 고분자에 도입한 이러한 산증식 기능을 갖는 그룹의 구조에 따라 광감도 증진 효과가 다르게 나타남을 확인하였다. Acid amplifying copolymers are synthesized by the copolymerization of tert-butyl methacrylate(tBMA) with acid-sensitive functional group and 4-hydroxy-4'p-styrenesufonyloxyisopropylidene dicyclohexane(HSI) or 4-p-styrenesulfonyloxy-4'-tosyloxyisopropylidenedicyclohexane(STI) with acid-amplifying group as novel polymeric acid amplifying photoresists. Poly(HSI-co-tBMA) film and Poly(STI-co-tBMA) film as acid amplifying photoresists show reasonable thermal stability in the absence of an acid species. Poly(STI-co-tBMA) film exhibits 2X higher photosensitivity, whereas Poly(HSI-co-tBMA) film show 2X lower photosensitivity compared with ptBMA homopolymer. The attachment of acid-amplifying units to polymer backbones could provide a novel way to enhance the photosensitivity of acid-sensitive polymers depending on the structure of acid-amplifying units.
단량체 조성 변화에 의한 수성 아크릴계 공중합체 제조 및 점착특성
김하수 ( Ha Su Kim ),임권택 ( Kwon Taek Lim ) 한국화상학회 2021 한국화상학회지 Vol.27 No.1
In order to manufacture an eco-friendly aqueous adhesive with improved peel strength and water resistance, we adjusted the ratio of acrylic monomers methyl methacrylate (MMA), butyl acrylate (BA), and methacrylic acid (MAA) so that Tg is close to room temperature, and used ammonium persulfate as an initiator. Then, an acrylic copolymer was emulsion-polymerized to prepare and evaluate an acrylic emulsion adhesive. As a result of synthesizing MMA:BA:MAA in a mole ratio of 55.2:43.5:1.3, it was confirmed that an acrylic copolymer emulsion was synthesized by GPC and particle size analysis, and volatile organic substances(VOCs) were not detected. Theoretical Tg is 18.1°C, close to room temperature, and as a result of evaluating the initial, final, and post-immersion adhesion by applying polyurethane foam, polyethylene foam, and polypropylene as adherends, it was confirmed that the peel strength was improved compared to existing products.
수용성 도료의 성능 향상을 위한 첨가제의 제작 및 특성
최원태 ( Won-tae Choi ),임권택 ( Kwon-taek Lim ),김하수 ( Ha-su Kim ) 한국화상학회 2018 한국화상학회지 Vol.24 No.3
In this study, blocked diisocyanates were prepared by reacting isophorone diisocyanate with sodium bisulfate to improve the water resistance of water-soluble coatings. On the other hand, surface modified nanoparticles was prepared by surface fuctinalization of metal oxide nanoparticles with a silane coupling agent using supercritical carbon dioxide as a solvent. Next, the surface modified nanoparticles were dispersed in water-soluble coatings using ball mill technique to control the gloss and the bonding with a non-polar resin. The FT-IR analysis showed that isocyanate groups were completely disappeared. The DSC measurement revealed that deblocking took place at a temperature over 150℃ and regenerated diisocyanate groups. The addition of 0.5 wt% of water soluble blocked diisocyanates to adhesives resulted in high adhesion and improved water resistance. In the case of surface modified nanoparticles, the reduced amount of TGA can be regarded as the ratio of the surface modified silane coupling agent to the metal oxide. MPS-modified SiO<sub>2</sub> of 6, 8, and 10 wt% f MPS were obtained after 6, 12, and 24 h of reaction time, respectively. When surface modified nanoparticles were mixed with water-soluble coatings, SiO<sub>2</sub> and TiO<sub>2</sub> gave the gloss of 5GU and 33GU, respectively, and the gloss could be adjusted with the type of surface modified nanoparticles.