• 한국수소및신에너지학회논문집
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• 제22권1호
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• pp.42-50
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• 2011

The Montmorillonite (MMT) in the polymer matrix is expected to reduce methanol permeability due to the tortous path formed by dispersed silicate layers. However, the polymer composite membranes containing non-proton conducting inorganic particle tend to show low proton conductivity. To solve this problem, we used an ion exchange method to prepare functionalized MMT with various silane coupling agents. The modified MMT was randomly dispersed in sulfonated poly (arylene ether sulfone) (SPAES) matrix to prepare SPAES/modified MMT composite membranes. The performances of hybrid membranes for DMFCs application were investigated. The SPAES/modified composite membrane showed increased proton conductivity compared with the non-modified MMT composite membrane. However, the methanol permeability of the SPAES/modified membrane was higher than that of the non-modified MMT.

• 멤브레인
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• 제17권4호
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• pp.311-317
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• 2007

Poly(vinyl alcohol-co-ethylene) (PVA-co-PE)와 poly(styrene sulfonic acid-co-maleic acid) (PSSA-co-PMA)을 고분자 블렌딩 방법으로 50 : 50의 무게비율로써 수소이온 전도성 가교형 전해질막을 제조하였다. PSSA와 PMA이 3 : 1과 1 : 1의 몰 구성비로 되이 있는 두 가지 종류의 PSSA-co-PMA 고분자를 수소이온 전도성 고분자로 사용하였으며, PVA-co-PE 고분자는 에틸렌의 함량이 0, 27 그리고 44 mol%인 고분자를 사용하였다. 전해질 막은 PVA의 히드록실 그룹과 PMA의 카르복시릭 그룹 사이의 에스테르화 반응을 통한 열가교를 통해 제조하였고, FT-IR을 통하여 이를 확인하였다. PSSA-co-PMA의 몰비율이 3 : 1로 구성되어 제조된 전해질막은 몰비율 1 : 1로 구성되어 제조된 막보다 더 낮은 이온교환용량과 더 높은 함수율, 수소이온 전도도를 나타내었다. 또한, 전해질막에서 PE의 함량이 증가할수록 이온교환용량, 함수율, 수소이온 전도도가 계속해서 감소하는 경향성을 보였다. 전해질막의 이러한 물성들은 술폰산기의 함량과 친수성, 막의 가교구조 사이의 경쟁적인 효과로써 설명하였다.

• 공업화학
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• 제29권4호
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• pp.363-368
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• 2018

Polyoxometalates (POMs)는 뛰어난 특성과 전기 화학 응용 분야에 대한 많은 잠재력을 가지고 있다. POM은 매우 잘 녹는 성질 때문에 전기화학 소자에서 POM의 잠재력을 최대한 활용하기 위해서는 다양한 기능성 재료에 POM을 고정화하는 과정이 필수이다. 본 논문에서는 우리는 최근 개발된 고정화 방법인 나노 카본 및 전도성 고분자와 같은 전도성 나노 물질에 POM을 도입하는 기술들에 대해서 논하고자 한다. Langmuir-Blodgett 기술, 층별 자기 조립 및 전기화학 in-situ 중합을 사용하여 전도성 고분자 매트릭스 및 POM을 나노 카본으로 도입할 수 있는 다양한 고정화 전략을 소개한다. 또한 우리는 POM의 응용 분야인 물 산화용 전극 촉매, 리튬 이온 배터리, 슈퍼커패시터 및 전기화학적 바이오 센서 등의 다양한 전기 화학 응용 분야를 다룬다.

• Bulletin of the Korean Chemical Society
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• 제32권4호
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• pp.1341-1345
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• 2011

A novel ruthenium(II) complex, [$RuCl_2(DMSO)_2$(PhenTPy)] has been synthesized by the condensation of $RuCl_2(DMSO)_4$ with (1-(1,10-phenanthrolinyl)-2,5-di(2-thienyl)-1H-pyrrole)[PhenTPy] in $CHCl_3$ solution. The [$RuCl_2(DMSO)_2$(PhenTPy)] complex modified electrode was fabricated through the electropolymerization of the monomer in a 0.1 M tetrabutylammonium perchlorate (TBAP)/$CH_2Cl_2$ solution, to take advantage of the electronic communication between metal ion center by the conjugated backbone. The UV-visible spectroscopy (UV), mass spectrometry (MS), and cyclic voltammetry (CV) were employed to characterize the [$RuCl_2(DMSO)_2$(PhenTPy)] complex and its polymer (poly-Ru(II)Phen complex). The poly-Ru(II)Phen complex modified electrode exhibited an electrocatalytic activity to the oxidation of acetaminophen and the catalytic property was used for the analysis of acetaminophen at the concentration range between 0.09 and 0.01 mM in a phosphate buffer solution (pH 7.0).

• 한국소음진동공학회:학술대회논문집
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• 한국소음진동공학회 2005년도 춘계학술대회논문집
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• pp.360-363
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• 2005

Biomimetic actuators composed of cellophane with an electrically conducting polyaniline(PANI) film have been fabricated and tested in air ambience conditions doped with two different counter ions such as perchlorate (${ClO_4}^-$) and tetrafluoroborate (${BF_4}^-$). Fabrication of the trilayer CP//CELLOPHANE//CP substantially enhanced the tip displacement (13.2mm) compared to the small displacement (8.3mm) of the bilaye. CP//CELLOPHANE. The ion migration among layers is the main factor behind the expansion of cellophane, while the expansion/contraction of PANI are dependent on the redox reaction of the polymer. The displacement of the composite is dominated by the humidity content. This implies that the actuation principle is possibly due to the assistance of water existing.

• 한국전기전자재료학회:학술대회논문집
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• 한국전기전자재료학회 1998년도 추계학술대회 논문집
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• pp.223-226
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• 1998

Organic conducting N-methyl phenazinium TCNQ (7,7,8,8-tetracyanoquinonedimethane) ion radical salt was synthesized and characterized by FTIR, EA. After blending this material with PMMA using NMP/DMF, the solution was bar-coated on a PET film and dried at 40$^{\circ}C$. The optical micrograph showed the fibril crystals. The surface resistivity was 10$\^$5/ $\Omega$/$\square$. The conductivity decreased considerably at temperatures above 80$^{\circ}C$, although it decreased slightly at RT and 4$^{\circ}C$.

• Fibers and Polymers
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• 제7권2호
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• pp.105-111
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• 2006

Coating the fibre surface by in situ oxidative chemical polymerisation of polypyrrole (using $FeCl_3$ as oxidant) is a readily industrial applicable way to give electrical properties to wool with good ageing stability [1], although pre-treatments are required to avoid damage of the cuticle surface due to the acidic condition of the process. FT-IR and EDX analysis reveal that organic sulphonates and sulphates, used as dopants, are absorbed by wool, while chlorine ions are preferably embedded on the polypyrrole layer. The resulting electrical conductivity seems mainly due to the presence of chlorine as counter-ion of polypyrrole; nevertheless, the presence of arylsulphonate in the polymerisation bath increases the electrical conductivity of the coating layer.

• Bulletin of the Korean Chemical Society
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• 제34권6호
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• pp.1763-1770
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• 2013

A series of the block copolymers were successfully synthesized from post-sulfonated hydrophilic and hydrophobic macromers via three-step copolymerization. The degrees of sulfonation (DS) of the copolymers (10%, 30%, or 50%) were controlled by changing the molar ratio of the hydrophilic and hydrophobic parts. The resulting block copolymers were characterized by $^1H$ NMR and other technologies. The membranes were successfully cast using dimethyl sulfoxide (DMSO) solution at $100^{\circ}C$. The copolymers were characterized to confirm chemical structure by $^1H$ NMR and FT-IR. Thermogravimetric analysis (TGA) and differential scanning calorimetry (DSC) demonstrated that all sulfonated block copolymers exhibited good thermal stability with an initial weight loss at temperatures above $240^{\circ}C$. The membranes showed acceptable ion exchange capacity (IEC) and water uptake values in accordance with DS. The maximum proton conductivity was 184 mS $cm^{-1}$ in block copolymer-50 at $60^{\circ}C$ and 100% relative humidity, while the conductivity of Nifion-115 was 160 mS $cm^{-1}$ under the same measurement conditions. AFM images of the block copolymer membranes showed well separated the hydrophilic and hydrophobic domains. From the observed results it is that the prepared block membranes can be considered as suitable polymer electrolyte membranes for the application of polymer electrolyte membrane fuel cells (PEMFC).

• 한국수소및신에너지학회논문집
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• 제16권2호
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• pp.103-110
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• 2005

Proton conducting solid polymer electrolyte (SPE) membranes have been used in many energy technological applications such as water electolysis, fuel cells, redox-flow battery, and other electrochemical devices. The availability of stable membranes with good electrochemical characteristics as proton conductivity at high temperatures above 80 $^{\circ}C$ and low cost are very important for its applications. However, the presently available perfluorinated ionomers are not applicable because of high manufacturing cost and high temperature use to the decrease in the proton conductivity and mechanical strength. In order to make up for the weak points, the block copolymer (BPSf) of polysulfone and poly (phenylene sulfide sulfone) were synthesized and sulfonated. The electrolyte membranes were prepared with phosphotungstic acid (HPA)/sulfonated BPSf via solution blending. This study would be desirable to investigate the interaction between the HPA and sulfonated polysulfone. The results showed that the characteristics of SPSf/HPA blend membrane was a better than Nafion at high temperature, 100 $^{\circ}C$. These membranes proved to have a high proton conductivity, $6.29{\times}10-2$ S/cm, a water content, 23.9%, and a ion exchange capacity, 1.97 meq./g dry membrane. Moreover, some of the membranes kept their high thermal and mechanical stability.

• 멤브레인
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• 제27권5호
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• pp.389-398
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• 2017

연료전지용 고분자 전해질막에 있어서 가장 중요한 특성인 수소이온 전달 능력은 내부에서 형성되는 수화채널의 분포 및 형상에 큰 영향을 받게 된다. 비과불화탄소계인 탄화수소계 전해질막의 경우, 과불화탄소계 전해질막인 나피온에 비하여 이러한 수화채널이 약하게 형성되는 것으로 알려져 있으며 따라서 상대적으로 낮은 이온전달 성능을 나타내는 것으로 보고되고 있다. 본 연구에서는 컴퓨터를 이용한 전산모사 기술의 하나인 메조스케일 전산모사 기술을 이용하여 탄화수소계 연료전지용 전해질막인 술폰화 폴리이미드의 가습조건에서의 수화채널 형성 및 상분리 현상을 관찰하였다. 이를 통하여 술폰화 폴리이미드 내부에서 물분자 비드는 친수성 영역 전체에 걸쳐서 고르게 분포되며 명확한 수화 클러스터는 높은 술폰화도에서만 형성되는 것이 관찰되었다. 또한, 술폰화 폴리이미드 모델은 저가습 상태에서 수화 채널을 형성하는데에 나피온 모델에 비하여 더 어렵다는 것이 관찰되었다. 이러한 결과들은 비과불화불소계인 탄화수소계 전해질막의 수화채널 형성에 대한 기존 이론을 명확하게 뒷받침하고 있으며, 술폰화 폴리이미드의 전도도 경향도 잘 설명을 하고 있다. 따라서 메조스케일 전산 모사 기술은 연료전지용 전해질막의 상분리 현상 및 수화채널을 분석하고 이온전도 특성을 규명하는 데에 있어서 매우 효과적인 기술이 될 수 있다는 것을 확인하였다.