• Title/Summary/Keyword: Hydrocarbon polymer

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Preparation of pore-filling membranes for polymer electrolyte fuel cells and their cell performances (고체 알칼리 연료전지용 음이온 교환 세공충진막의 제조 및 특성)

  • Choi, Young-Woo;Park, Gu-Gon;Yim, Sung-Dae;Lee, Mi-Soon;Yang, Tae-Hyun;Kim, Chang-Soo
    • 한국신재생에너지학회:학술대회논문집
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    • 2009.11a
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    • pp.150-153
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    • 2009
  • Anion exchange polymer electrolyte pore-filling membranes consisting of the whole hydrocarbon materials were prepared by photo polymerization with various quaternary ammonium cationic monomers and characterized on the properties for applying to solid alkali fuel cell (SAFC). Hydrocarbon porous substrates such as polyethylene were used for the preparation of the pore-filling membranes. The hydroxyl ion conductivity of the polymer electrolyte membranes prepared in this research was dependent on the composition ratio of an electrolyte monomer and crosslinking agents used for polymerization. Furthermore, these pore-filling membranes have commonly excellent properties such as smaller dimensional affects when swollen in solvents, higher mechanical strength, lower fuel crossover through the membranes, and easier preparation process than those of traditional cast membranes.

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Viscoelastic and Gelation Studies of SEBS Thermoplastic Elastomer in Different Hydrocarbon Oils

  • Kim Jin-Kuk;Paglicawan Marissa A.;Balasubramanian Maridass
    • Macromolecular Research
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    • v.14 no.3
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    • pp.365-372
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    • 2006
  • Poly[styrene-b-(ethylene-co-butylene)-b-styrene](SEBS) triblock copolymer was studied by dissolving the ethylene butylene midblock in selective hydrocarbon oils. These oils differ in their aromatic, paraffinic and naphthenic content. Dynamic rheological studies showed that the storage modulus (G') exceeded the loss modulus (G') for all the gels over the entire range of frequency, thereby confirming them as physical gels. However, the behavior of G' and G' as a function of frequency depended primarily on the oil type. The gelation melting temperature decreased drastically with increased oil aromaticity. Small angle X-ray scattering studies revealed that the maximum interdomain interference shifted to a higher angle depending on the composition and type of hydrocarbon oil.

Research of Cross-linked Hydrocarbon based Polymer Electrolyte Membranes for Polymer Electrolyte Membrane Fuel Cell Applications (고분자 전해질 막 연료전지 응용을 위한 탄화수소계 기반 가교 전해질 막의 연구동향)

  • Ko, Hansol;Kim, Mijeong;Nam, Sang Yong;Kim, Kihyun
    • Membrane Journal
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    • v.30 no.6
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    • pp.395-408
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    • 2020
  • Polymer electrolyte membrane fuel cells (PEMFCs) have gained much attention as eco-friendly energy conversion devices without emission of environmental pollutant. Polymer electrolyte membrane (PEM) that can transfer proton from anode to cathode and also prevent fuel cross-over has been regarded as a key component of PEMFCs. Although perfluorinated polymer membranes such as Nafion® were already commercialized in PEMFCs, their high cost and toxic byproduct generated by degradation have still limited the wide spread of PEMFCs. To overcome these issues, development of hydrocarbon based PEMs have been studied. Incorporation of cross-linked structure into the hydrocarbon based PEM system has been reported to fabricate the PEMs showing both high proton conductivity and outstanding physicochemical stability. This study focused on the various cross-linking strategies to the preparation of cross-linked PEMs based on hydrocarbon polymers with ion conducting groups for application in PEMFCs.

Fabrication of Hydrocarbon Polymer Electrolyte Composite Membrane Incorporated with Pt Nanopartle for PEMFC and Its Characteristics (Pt 나노 입자가 도입된 연료전지용 탄화수소계 고분자 전해질 복합막의 제조 및 특성)

  • LEE, HONGKI
    • Transactions of the Korean hydrogen and new energy society
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    • v.28 no.3
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    • pp.246-251
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    • 2017
  • To fabricate a hydrocarbon polymer electrolyte composite membrane incorporated with Pt nanoparticle, the polymer electrolyte membrane made of a sulfonated-fluorinated hydrophilic-hydrophobic block copolymer (SFBC) and sulfonated poly (ether ether ketone) (SPEEK) blend in the wight ratio of 1 : 1 was synthesized, and a simple drying process was used in order to incorporate Pt nanoparticle into the SFBC/SPEEK film by reducing platinum (II) bis (acetylacetonate), Pt $(acac)_2$. The distribution of the Pt nanoparticles was observed by transmission electron microscopy (TEM), and mechanical and thermal properties were tested by universal testing machine (UTM) and thermogravimetry analyzer (TGA). Cation conductivity, ion exchange capacity (IEC) and I-V characteristics were estimated.

A study on composite membranes based on hydrocarbon polymers and ionic liquids for high temperature PEFCs (고온 PEFCs를 위한 탄화수소계열 고분자와 이온성 액체를 함유하는 복합막에 관한 연구)

  • Baek, Ji-Suk;Park, Jin-Soo;Kim, Kyung-Hyun;Moon, Gi-Young;Kim, Hye-Kyung;Choi, Young-Woo;Park, Go-Gun;Yang, Tae-Hyun;Kim, Chang-Soo;Shul, Young-Gun
    • 한국신재생에너지학회:학술대회논문집
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    • 2009.11a
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    • pp.147-148
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    • 2009
  • The water-like ionic liquids have been widely used to enable the proton conduction in ionic liquid based membranes at high temperature and anhydrous PEFCs. In this study, we synthesized various kinds of composite membranes based on hydrocarbon polymers having good thermal and mechanical stabilities at high temperatures and ionic liquids. The composite membrane consisting of hydrocarbon polymer and ionic liquid was characterized by thermogravimetric analyzer (TGA) and impedance spectroscopy. Consequently the non-aqueous composite membranes of a variety of hydrocarbon polymer and ionic liquids have good conductivity and thermal stability at high temperature conditions.

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An Analysis on Applicability of Geophysical Exploration Methods to Monitoring Polymer-flooding (물리탐사 기법들의 화학공법 모니터링 적용성 분석)

  • Cheon, Seiwook;Park, Chanho;Ku, Bonjin;Nam, Myung Jin;Son, Jeong-Sul
    • Geophysics and Geophysical Exploration
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    • v.18 no.3
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    • pp.143-153
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    • 2015
  • Polymer flooding for enhancing hydrocarbon production injects into a reservoir polymer solution that is viscous. It is very important to monitor the behavior pattern of the polymer solution in order to evaluate the effectiveness of polymer flooding. To monitor the distribution of polymer solution and thus fluid substitution within the reservoir, we first construct seismic and resistivity rock physics models (RPMs), which are functions of reservoir parameters such as rocks and type of fluid, fluid saturation. For the seismic and resistivity RPMs, responses of seismic and electromagnetic (EM) tomography are numerically simulated as polymer injection, using two dimensional (2D) staggered-grid finite difference elastic modeling and 2.5D finite element EM modeling algorithms, respectively. In constructing RPM for EM tomography, three different reservoir rocks are considered: clean-sand, dispersed shale-sand, and sand-shale lamination rocks. The polymer solution is assumed to have 2 wt% of polymer as normally generated, while water is freshwater or saltwater. Further, neutron logging is also considered to check its sensitivity to polymer flooding. The techniques discussed in the paper are important in monitoring not only hydrocarbon but also geothermal reservoirs.

Preparation of pore-filling membranes for polymer electrolyte fuel cells and their cell performances (고분자 연료전지용 세공충진막의 제조 및 연료전지 특성)

  • Choi, Young-Woo;Park, Jin-Soo;Lee, Mi-Soon;Park, Seok-Hee;Yang, Tae-Hyun;Kim, Chang-Soo
    • 한국신재생에너지학회:학술대회논문집
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    • 2009.06a
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    • pp.278-281
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    • 2009
  • Proton exchange membrane is the key material for proton exchange membrane fuel cells (PEMFC). Currently widely-used perfluorosulfonic acid membranes have some disadvantages, such as low thermal stability, easy swelling, excessive crossover of methanol and high price etc. Other membranes, including sulfonated polymer, radiation grafted membranes, organic-inorganic hybrids and acid-base blends, do not satisfy the criteria for PEMFC, which set a barrier to the development and commercialization of PEMFC. Pore-filling type proton exchange membrane is a new proton exchange membrane, which is formed by filling porous substrate with electrolytes. Compared with traditional perfluorosulfonic acid membranes, pore-filling type proton exchange membranes have many advantages, such as non- swelling, low methanol permeation, high proton conductivity, low cost and a wide range of materials to choose. In this research, preparation methodology of pore-filling membranes by particularly using all hydrocarbon polymers and fuel cell performances with the membranes are evaluated.

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Robust Polymeric Membranes for the Separation of Petrochemicals using Pervaporation

  • Nam, Sang-Yong
    • Proceedings of the Membrane Society of Korea Conference
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    • 2004.05a
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    • pp.51-54
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    • 2004
  • Utilization of membranes offers the promise of extraordinary energy savings if successfully applied to hydrocarbon-hydrocarbon and other organic separations. Membranes are bound to enter into refining and petrochemical operations involving liquid separations once appropriate materials and modules are developed. Hybrid processes such as utilizing membrane modules to break azeotropes formed during distillation are particularly attractive because they offer less process complexity and reduced capital investment[1,2].(omitted)

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Synthetic Strategies for High Performance Hydrocarbon Polymer Electrolyte Membranes (PEMs) for Fuel Cells (고성능 탄화수소계 고분자 전해질막의 합성 전략)

  • Lee, So Young;Kim, Hyoung-Juhn;Nam, Sang Yong;Park, Chi Hoon
    • Membrane Journal
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    • v.26 no.1
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    • pp.1-13
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    • 2016
  • Fuel cells are regarded as a representative energy source expected to replace fossil fuels particularly used in internal combustion engines. One of the most important components is polymer electrolyte membranes (PEMs) acting as a proton conducting barrier to prevent fuel gas crossover. Since water channels act as proton pathways through PEMs, many researchers have been focused on the 'good phase-separation of hydrophilic moiety' which ensures high water retention under low humidity enough to keep the water channel for good proton conduction. Here, we summarized the strategies which have been adopted to synthesize sulfonated PEMs having high proton conductivities even under low humidified conditions, and hope this review will be helpful to design high performance hydrocarbon PEMs.

Synthesis of Polymers in Supercritical Carbon Dioxide (초임계 유체를 이용한 고분자 합성 연구)

  • Lee, Hyun-Suk;Kim, Jin-Woong
    • Journal of the Society of Cosmetic Scientists of Korea
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    • v.36 no.1
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    • pp.17-32
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    • 2010
  • This review shows the design and the development of new $CO_2$-soluble hydrocarbon copolymers which can be used as effective stabilizers for successful dispersion polymerizations of bio-compatible materials in supercritical carbon dioxide ($scCO_2$). The basic concepts of supercritical fluid including its solvent properties and applications in polymer synthesis are described. We report the facile synthesis of highly soluble hydrocarbon based copolymers, prepared with good control via controlled free radical polymerization from readily accessible and commercially available monomers. The phase behaviour of these materials was monitored in pure $CO_2$ to investigate how the molecular weights and the composition of the copolymers affect their solubility in $CO_2$. Their activity as a stabilizer was then tested in dispersion polymerization of N-vinyl pyrrolidone in $CO_2$ at various reaction conditions to identify the key parameters required for a successful dispersion stabilization of growing PVP particles. Some prospective potentials of this research which can be applied in developing new polymer materials in an environmentally-friendly fashion for use in cosmetics are also discussed.