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오창민,황택성,정민호 한국공업화학회 2014 한국공업화학회 연구논문 초록집 Vol.2014 No.1
In this study, we were synthesized poly(vinylimidazole-co-trifluoroethylmethacrylate- co-divinylbenzene)(PVTD) copolymer and introduced functional group through quaterization reaction for removing nitrate from drinking water. Also, optimizing conditions for introducing the functional group was confirmed. The basic properties such as water uptake, swelling ratio, electrical resistance, ion exchange capacity and anion permselectivity for removing nitrate from drinking water were measured. The optimal values of water uptake, electircal resistance and ion exchange capacity of synthesized anion exchange membrane were 51.2 %, 5.4 Ω/cm-1, 1.04 meq/g, respectively.
오창민(Chang Min Oh),황택성(Taek Sung Hwang) 한국고분자학회 2015 폴리머 Vol.39 No.1
본 연구에서는 수중 질산성 질소(NO3<SUP>-</SUP>) 제거용 음이온교환막 제조를 위하여 poly(vinylimidazole-co-trifluoroethylmethacrylate-co-divinylbenzene)(PVTD) 공중합체를 제조하고, quaternization 반응을 통하여 관능기를 도입하기 위한 최적화 반응온도, 반응시간, 관능화농도 조건을 규명하였다. 제조한 음이온교환막의 구조 확인과 분자량 측정을 위하여 FTIR, <SUP>1</SUP>H NMR, 스펙트럼 분석과 GPC 분석을 하였다. 또한 제조한 음이온교환막의 함수율, 팽윤율, 전기저항, 이온교환용량과 같은 기본물성을 측정하였다. 또한 수중 질산염 제거율과 선택성을 확인하기 위하여 막의 음이온 투과성을 측정하여 질산성 질소의 선택성을 확인하였다. 최적 함수율, 전기저항, 이온교환용량은 각각 51.2%, 5.4 Ω·cm<SUP>2</SUP>, 1.04 meq/g으로 측정되었다. In this study, we synthesized poly(vinylimidazole-co-trifluoroethylmethacrylate-co-divinylbenzene) (PVTD) copolymer and introduced functional group through quaternization reaction for removing nitrate from drinking water. Also, optimizing conditions (reaction time, reaction temperature and functionalized agents concentration) for introducing the functional group were confirmed. The basic properties such as water uptake, swelling ratio, electrical resistance, ion exchange capacity and anion permselectivity for removing nitrate from drinking water were measured. The optimal values of water uptake, electrical resistance and ion exchange capacity of synthesized anion exchange membrane were 51.2%, 5.4 Ω·cm<SUP>2</SUP>, and 1.04 meq/g, respectively.
Lee, S.D.,Kim, B.M.,Kim, D.W.,Kim, M.I.,Roshan, K.R.,Kim, M.K.,Won, Y.S.,Park, D.W. Elsevier 2014 Applied Catalysis A Vol.486 No.-
Polystyrene-supported quaternized ammonium salt catalysts (PS-alkyl-AX) were synthesized and characterized by various physicochemical analytic methods such as EA, FT-IR, XPS, and SEM. The reactivity of the catalysts was investigated for the synthesis of allyl glycidyl carbonate from CO<SUB>2</SUB> and allyl glycidyl ether under mild reaction conditions. The PS-alkyl-AX catalysts showed good catalytic activity without using any solvent due to the synergistic effect of NH functional group and quaternary ammonium salt structure. Theoretical studies using density functional theory (DFT) was applied to investigate the reaction mechanism. The PS-hexyl-MeI catalyst was readily recoverable and reusable in subsequent reaction cycles without a significant loss in its activity.
박희경,김재훈,정진주,최슬기,이정수 한국공업화학회 2020 한국공업화학회 연구논문 초록집 Vol.2020 No.-
We present the cross-linkable organic/inorganic hybrid polymer successfully obtained by quaternization of Poly(4-vinly-pyridine) with unique functional group containing ethoxysilane. Herein, we have synthesized breakthrough complex process (cross-linking and composite technique) to efficiently and excellently enhance the physical properties of polymer in simple one step. To characterize the improved properties of polymer prepared via cross-linking(silanol) reactions occurred by thermal annealing, the thermal properties of fabricated samples were monitored by analyzing DSC and TGA, and chemical structures were confirmed by H<sup>1</sup>-NMR and FT-IR spectroscopy. The resultant physical properties lead to the improvement in the performance of the organic/inorganic hybrid polymer composite were expected to be used as promising materials for a various of science fields.
4차 염화 가교화된 Vinylbenzyl chloride 공중합체를 감습막으로 이용한 습도센서의 감습 특성
이성수,공명선,Lee, Seong-Su,Gong, Myeong-Seon 한국재료학회 2000 한국재료학회지 Vol.10 No.12
고분자막 습도센서의 감습재료로 사용하기 위하여 vinylbenzyl chloride (VBC), methyl methacrylate (MMA) 그리고 2-hydroxyethyl methacrylate (HPMA)의 여러 가지 조성의 공중합체를 합성하여, 이를 전극에 도포하고 N, N, N', N'-tetraethylene diamine으로 4차 암모늄화 시켜 최종 습도센서를 제조하였다. 상대습도에 따른 저항 변화를 측정한 결과, 공중합체에서 MMA의 조성이 증가하면 저항이 증가하였으며, HEMA의 도입은 친수성기의 작용으로 저항의 증가는 크지 않았으며 강습막의 기판과의 접착성은 크게 향상되었다 또한 VBC/MMA/HEMA=80/10/10의 경우 히스테리시스는 $\pm$2%RH 안에서 나타났으며, 온도의존성 계수는 -0.42~-0.46%RH/$^{\circ}C$이었다. 30%RH, 60%RH 그리고 90%RH에서의 저항 값은 각각 3.0M$\Omega$,,200k$\Omega$ 그리고 9k$\Omega$ 이었다. The copolymers with various composition of vinylbenzyl chloride (VBC), methyl methacrylate (MMA), and 2-hydroxyethyl methacrylate(HEMA) were synthesized as a humidity sensitive material and quaternized with N, N, N', N'-tetraethylene diamine.. Resistance versus relative humidity decreased with increase in the content of MMA in the copolymer. The introduction of HPMA increased the resistance of the humidity sensor as well as enhanced the adherence to the alumina substrate. In the case of VBC/MMA/HEMA=80/10/10, the hysteresis and temperature dependency coefficient were $\pm$2%RH and -0.46~0.42%RH/$^{\circ}C$. The average resistance at 30%RH, 60%RH and 90%RH were 3.0M$\Omega$ ,200k$\Omega$ and 9k$\Omega$, respectively.
황성연,김정주,박은지,황택성 한국고분자학회 2020 Macromolecular Research Vol.28 No.5
In this study, polyketone anion exchange fibers were synthesized by the amination of polyketone via a Paal-Knorr reaction and a quaternization reaction. The amination reaction proceeded at different reaction times and amine N,N-dimethylethylene diamine (DME) concentrations. The ion exchange capacity (IEC) and water uptake (W.U.) increased with increasing amination reaction time and DME concentration, and the maximum IEC and W.U. were 1.03 meq/g and 19.2%, respectively. The tensile strength decreased signiicantly with increasing amination time and amine concentration. TGA showed that the thermal decomposition temperature of the fibers was 220°C. The HCl gas adsorption properties of the aminated polyketone ion exchange fibers were evaluated, and the HCl gas removal efficiency remained at 100% in 40 min at 300 ppm.
Md. Awlad Hossain,Young Don Lim,Ho-Hyoun Jang,Young-Tae Jeon,Jin-Sung Lim,Soon Ho Lee,김환기,전흥석 대한금속·재료학회 2013 ELECTRONIC MATERIALS LETTERS Vol.9 No.6
Novel anion-exchange membranes with high conductivities have been prepared for application to alkaline fuel cells. A quaternary ammonium poly(dibenzoylbenzene ether sulfone) membrane was synthesized by chloromethylation,followed by substitution with trimethylamine with an ion-exchange reaction. The quaternary ammonium groups were selectively substituted in the para-position of the pendant phenyl groups of the dibenzoylbenzene unit. The di-quaternary ammonium hydroxide polymers showed an elevated molecular weight and exhibited excellent solubility in polar aprotic solvents. Quaternization and the subsequent ion-exchange reactions were quantitative such that the obtained ionomer membranes had a high ion-exchange capacity (IEC) of up to 1.69 mmolg−1. The resultant polymer membranes were studied by 1H NMR, FT-IR, thermogravimetric analysis (TGA), IEC, water uptake analysis, and ion conductivity analysis.
정경석,정민호,황택성 한국공업화학회 2015 한국공업화학회 연구논문 초록집 Vol.2015 No.1
The poly(vinylimidazole-co-trifluoroethylmethacrylate-co-divinylbenzene)( QPVTD) copolymers were synthesized by solution polymerization. The quaternization of PVTD copolymers were carried with functionalizing reagents such as 1-bromo-2-methylpropane, 1-bromobutane, 1-bromo-3-methylbutane, 1-bromopentane. The QPVTD anion exchange membranes were prepared by the casting method. The chemical structure of the membranes were confirmed by FT-IR, <sup>1</sup>H-NMR spectrometer. The membrane properties such as water content, ion exchange capacity, electrical resistance and ion permselectivity for nitrate were measured. The maximum water uptake, electrical resistance and ion exchange capacity were 60.85%, 8.0 Ω/cm<sup>2</sup> and 1.25 meq/g, respectively.
Tomáš Faukner,Libor Slaný,Ivana Šloufová,Jiří Vohlídal,Jiří Zedník 한국고분자학회 2016 Macromolecular Research Vol.24 No.5
The reaction of 2-ethynylpyridine (2EP) with stoichiometric equivalent of an alkyl halide RX (R is ethyl, nonyl, or hexadecyl and X is Br or I) gives a poly(N-alkyl-2-ethynylpyridinium halide) type ionic polymer that belongs to the family of π-conjugated polyelectrolytes (CPEs). Reaction conditions significantly influence configuration of the polymer main chains: polymerization in acetonitrile solution gives polymers with high content of cis units while bulk polymerization provides irregular cis/trans polymers. Increased regularity of the high-cis polymers is documented by the NMR and IR as well as SERS (surface enhanced Raman scattering) spectra measured on Ag-nanoparticles/ CPE systems. Both polymerization processes give polymers in which 2EP monomeric units are ionized only from ca one half, which exhibit good stability in air and good solubility in polar solvents such as MeOH, DMF, and DMSO and those with N-ethylpyridinium groups even in water.