• Proceedings of the KAIS Fall Conference
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• 2011.12a
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• pp.367-369
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• 2011

본 연구에서는 글리세롤과 우레아를 이용하여 글리세롤카보네이트를 합성하는 반응을 진행하였다. ZnO와 Zn-Al 이원계 금속 산화물 촉매를 제조하고, 제조되어진 촉매를 사용하여 글리세롤의 전환율과 글리세롤카보네이트의 수율을 확인하였고, Al의 첨가에 따른 촉매 특성의 분석과 글리세롤카보네이트 합성반응에서의 역할에 대해 확인하였다. 글리세롤카보네이트 합성 반응에서 ZnO를 단독으로 촉매를 사용한 경우보다 Zn-Al 혼합 산화물을 촉매로 사용하여 반응하였을 때, 부반응이 억제되어 전환율 및 수율이 증가함을 확인하였다.

• Proceeding of EDISON Challenge
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• 2016.03a
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• pp.113-115
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• 2016

온실가스의 주범을 친환경적으로 활용한다는 측면과 carbon source를 영구적으로 저렴한 비용으로 공급할 수 있다는 경제적 측면에서 CO2를 활용한 고부가가치 화학물질의 합성이 최근에 주목 받고 있다. 본 연구에서는 살렌(salen)-전이금속 착물을 단일 촉매로 사용한 모델 시스템을 통해 고부가가치 소비재의 주된 원료인 고리형 카보네이트 (cyclic carbonate)와 폴리카보네이트 (polycarbonate)가 생성되는 반응경로를 규명하였으며, 이들의 활성화 에너지를 조절함으로써 생성물을 선택적으로 합성할 수 있다는 이론적 근거를 제시하였다.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.13 no.1
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• pp.456-461
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• 2012

The glycerol carbonate was synthesized by glycerol and urea using metal oxide catalysts. The physical properties of the prepared metal oxide catalysts were investigated by X-ray diffraction (XRD), specific surface area analysis (BET), field emission scanning electron microscopy (FE-SEM) and temperature programmed desorption (TPD). In addition, we confirmed the conversion of the glycerol and the yield of the glycerol carbonate according to characteristics of metal oxide catalysts. From XRD and FE-SEM analysis, the crystallite size and crystallinity of metal oxide catalysts decrease with addition of Al. In addition, the Zn-Al mixed metal oxide had higher catalytic activity than the pure ZnO due to decreased side reaction in the synthesis of glycerol carbonate.

• Proceedings of the KAIS Fall Conference
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• 2009.12a
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• pp.1034-1037
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• 2009

지구온난화룰 일으키는 온실가스중 하나인 이산화탄소를 제거하기 위하여 여러 가지 Epoxide와 이산화탄소를 Tetrabutylammonium bromide를 촉매로 하여 고압(900-1600psi), 고온($90^{\circ}C$)에서 반응시켜 고리형 카보네이트를 합성하였다. 합성된 고리형카보네트의 구조는 는 H-NMR, GC=MS, FT-IR을 이용하여 확인하였다.

• Journal of the Korean Chemical Society
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• v.54 no.2
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• pp.234-239
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• 2010

Carbonate derivatives were synthesized for the use of diesel additives and the derived cetane numbers of the derivatives were measured. Some carbonate ester derivatives were synthesized from 1,2-glycerol carbonate and long alkyl chain fatty acids. To improve the solubility, we introduced unsaturated groups into aliphatic carbons and alkyl group into ${\alpha}$-carbon to the carbonyl group. The derived cetane numbers obtained from ASTM method were increased up to 1.0, which means some carbonate derivatives could be potential diesel additives.

• Polymer(Korea)
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• v.25 no.6
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• pp.759-764
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• 2001

In order to obtain PEO with reduced crystallinity, novel PEO derivatives containing carbonate linkages in the main chain have been synthesized by the reaction of various molecular weight poly (ethylene glycol)s (PEGs) with dimethyl carbonate (DMC) in the presence of $H_2SO_4$ to yield methyl carbonate terminated PEGs, followed by condensation reaction under vacuum in the presence of titanium isopropoxide (TiP) catalyst. The number average molecular weight of PEGs used was in the range of 200 and 600 g/mol. The structure and compositions of the resulting polymers were characterized by $^1$H-NMR and $^{13}C-NMR$. Their thermal behavior and molecular weight were characterized by DSC/TGA and GPC, respectively.

• Korean Chemical Engineering Research
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• v.48 no.2
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• pp.164-171
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• 2010

Recently, the waste of Polycarbonate(PC) is increase with the increase in demand of a polycarbonate. It is concerned with producing a new material and diol monomer, bishydroxyethyl ether of bisphenol A(BHE-BPA) through depolymerization of the polycarbonate waste at recycling. BHE-BPA can be used as a good raw material for the synthesis of polycarbonate type polyurethane. PC particles were depolymerized with base-catalyst NaOH, solvent EG, and ethylene carbonate(EC) was formed during the PC depolymerziation. EC was added to promote the conversion from bispenol-A to BHE-BPA. The characteristics of depolymeraion of polycarbonate as well as conversion of bispenol-A to BHE-BPA were investigated. BHE-BPA yield of 92% was obtained at temperature $220^{\circ}C$, 10% catalyst/PC mole ratio, 20 mmol of EC. BHE-BPA purity of better than 99% was achieved by crystallization of BHE-BPA.

• Polymer(Korea)
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• v.32 no.5
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• pp.427-432
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• 2008

Hard coatings were deposited on a polycarbonate plate as potential substitutes for glass in cars. In this research polyphenylene derivatives were synthesized and the coatings were conducted on a polycarbonate plate. Poly(benzoylphenylene) and its phenylene copolymers were synthesized. Using poly (benzoylphenylene), the coating showed 1H class of pencil hardness. And using its copolymers, the coating showed 2H class of pencil hardness. The copolymer also showed the better abrasion resistance than homopoly (benzoylphenylene).

• Applied Chemistry for Engineering
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• v.1 no.1
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• pp.52-62
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• 1990

Cationic polycarbonate type polyurethane was prepared from the quaternization reaction of N-methyldiethanolamine(MDEA) in urethane backbone which was obtained from the reaction of polycarbonate polyol, MDI and MDEA(chain exetender). Tensile strength and modulus of the cationic urethane resins were increased sharply with increasing the ionic content in urethane backbone. But hydrolysis resistance was decreased with increasing ionic contents. The selectivity of the cationic polycabonate urethane membrane for water/ethanol separation by pervaporation was about 20. The carrier mediated transport mechanism was considered the most probable separation mechanism for these membranes.

• Polymer(Korea)
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• v.35 no.6
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• pp.537-542
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• 2011

Fracture behaviors of polycarbonate (PC)/polyestrercarbonate (PEC) blends and their miscibility have been examined to find out the mechanism of ductilie-brittle transition of fracture behavior which would be a main governing factor on the thickness sensitivity of impact strength of PC. $T_g$ measurement showed that PEC with a carbonate content higher than 30 mol% was miscible with PC. In the notched Izod impact test of PC, ductile-brittle transition occurred in the range of 4 to 5 mm thickness. The impact strength of miscible PC/PEC5 blends ductile-fractured in the thin specimens decreased with increasing PEC5 content, which was in accordance with the decrease of elongation at break in tensile test. In the brittle fracture of the thick specimens, the impact strength was well correlated with the plastic zone size in the vicinity of the notch tip.