• Title/Summary/Keyword: poly (ether ether ketone)

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Characterization of Polymer Blends of Poly(ether sulfone)/Sulfonated Poly(ether ether ketone) for DMFC (직접메탄올 연료전지용 Poly(ether sulfone)/Sulfonated Poly(ether ether ketone) 블렌드 막의 특성 연구)

  • Cheon, Hun Sang;Lee, Choong Gon;Hong, Seong Uk
    • Applied Chemistry for Engineering
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    • v.16 no.1
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    • pp.144-149
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    • 2005
  • Sulfonated poly(ether ether ketone) (SPEEK) was blended with poly(ether sulfone) (PES) at various compositions. To investigate the possibility of using the blend membranes as polymer electrolyte membranes for direct methanol fuel cell, the blend membranes were characterized in terms of methanol permeability, proton conductivity, ion exchange capacity, and water content. Both proton conductivity and methanol permeability of SPEEK were relatively high. As the amount of PES increased, methanol permeability decreased more rapidly compared to proton conductivity. The experimental results indicated that the blend membrane with 40 wt% PES was the best choice in terms of the ratio of proton conductivity to methanol permeability.

Preparation and Their Characterization of Blended Polymer Electrolyte Membranes of Polysulfone and Sulfonated Poly(ether ether ketone) (Polysulfone/SPEEK 블랜드 고분자 전해질 막 제조 및 특성 연구)

  • Cheon, Hun-Sang;Oh, Min;Hong, Seong-Uk
    • Membrane Journal
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    • v.13 no.1
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    • pp.47-53
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    • 2003
  • Poly(ether ether ketone)(PEEK) was sulfonated using sulfuric acid and blended with polysulfone with various ratios. The blended polymer electrolyte membranes were characterized in terms of methanol permeability, proton conductivity and ion exchange capacity. As the amount of sulfonated PEEK increased, both methanol permeability and proton conductivity increased. This was due to the increase of ion exchange capacity. The experimental results indicated that the blend membrane with 20% polysulfone was the best choice In terms of the ratio of proton conductivity to methanol permeability.

Performance Study of Membrane Capacitive Deionization Installed with Sulfonated Poly(ether ether ketone) and Poly(vinyl amine)/poly(vinyl alcohol) Membranes (Sulfonated Poly(ether ether ketone) 및 Poly(vinyl amine)/poly(vinyl alcohol) 혼합막이 장착된 막결합형 축전식 탈염공정의 성능 연구)

  • Kim, Ka young;Rhim, Ji Won
    • Membrane Journal
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    • v.26 no.1
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    • pp.62-69
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    • 2016
  • In this study, sulfonated poly(ether ether ketone) (SPEEK) as cation exchange membrane and blended and crosslinked poly(vinyl amine) (PVAm) with poly(vinyl alcohol) (PVA) membrane as anion exchange membrane were used and then the performance experiments of the membrane capacitive deionization (MCDI) installed with both membranes were carried out. The newly prepared anion exchange membrane were characterized through water content, ion exchange capacity and FT-IR. The crosslinking time of 3 h to 5 h indicated that the salt removal was reduced from 81.3, 65.7% to 53.8%. The effect of PVAm contents from 40, 60, to 80% on the salt removal was shown 81.3, 75.2 and 37.7%, respectively. As a result, it was concluded that the crosslinking time and the content of PVAm had an influence on the salt removal efficiency.

Fabrication and Electrochemical Characterization of Ion-selective Composite Carbon Electrode Coated with Sulfonated Poly(Ether Ether Ketone) (Sulfonated Poly(Ether Ether Ketone)을 코팅한 이온선택성 복합탄소전극의 제조 및 전기화학적 특성 분석)

  • Choi, Jae-Hwan;Park, Chan-Mi
    • Applied Chemistry for Engineering
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    • v.24 no.3
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    • pp.247-252
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    • 2013
  • Sulfonated poly(ether ether ketone) (SPEEK) with a certain degree of sulfonation were synthesized by reacting PEEK and sulfuric acid at different reaction time. Then ion-selective composite carbon electrodes (ISCCE) were fabricated by coating the prepared SPEEK on the surface of carbon electrodes. The specific capacitance and resistance of the ISCCE were analyzed by electrical impedance spectroscopy. The ion exchange capacities (IEC) of the SPEEKs were measured in the range of 1.60~2.57 meq/g depending on the sulfonation time. The SPEEK more than 2.5 meq/g of IEC was considered unsuitable for fabricating the ISCCE because it was dissolved in water. The specific capacitance of the prepared ISCCE increased with increasing the IEC of coated SPEEKs and the capacitance was improved up to about 20% compared to that of uncoated carbon electrode. In addition, the electrical resistance of coating layer decreased significantly with increasing the IEC of coated SPEEKs. It is expected that the desalination efficiency of conventional capacitive deionization process can be improved by using the prepared ISCCE coated with SPEEK.

Enhanced Interfacial Adhesion between Polymers and Metals(Cu) by Low Energy Ion-beam Irradiation with Reactive Gases (반응성 기체를 첨가한 저 에너지 이온빔 처리에 의한 고분자와 금속 간의 계면 접착력 증가에 관한 연구)

  • Lee, Ji-Seok;Seo, Yong-Sok;Kim, Han-Seong;Gang, Tae-Jin
    • Proceedings of the Korean Society For Composite Materials Conference
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    • pp.75-78
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    • 2005
  • Using a low-energy Ar+ ion-beam with and without reactive gases, polymers such as chemically stable poly(ether ether ketone) (PTFE) and poly(ether ether ketone) (PEEK) films were modified to have special surface features. The adhesion strength between the polymers and the copper was significantly improved because of both changes in the surface topography and chemical interactions due to polymer surface functionalization (oxidation and amination). The surface modification altered the failure mode from adhesive failure for the unmodified polymer/Cu interface to cohesive failure for the surface-modified polymer/Cu layer interface..

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Titanium Dioxide Nanoparticles filled Sulfonated Poly(ether ether ketone) Proton Conducting Nanocomposites Membranes for Fuel Cell

  • Kalappa, Prashantha;Hong, Chang-Eui;Kim, Sung-Kwan;Lee, Joong-Hee
    • Proceedings of the Korean Society For Composite Materials Conference
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    • pp.87-90
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    • 2005
  • This paper presents an evaluation of the effect of titanium dioxide nanoparticles in sulfonated poly(ether ether ketone) (SPEEK) with sulfonation degree of 57%. A series of inorganic-organic hybrid membranes were prepared with a systematic variation of titanium dioxide nanoparticles content. Their water uptake, methanol permeability and proton conductivity as a function of temperature were investigated. The results obtained show that the inorganic oxide network decreases the proton conductivity and water swelling. It is also found that increase in inorganic oxide content leads to decrease of methanol permeability. In terms of morphology, membranes are homogeneous and exhibit a good adhesion between inorganic domains and the polymer matrix. The properties of the composite membranes are compared with standard nafion membrane.

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Facilitated Transport Membrane for Ethylene/Ethane and Propylene/Propane Separation (SPEEK-Ag 촉진 수송 분리막을 이용한 $C_2,\;C_3$ 계 올레핀/파라핀 분리)

  • Kim, Ji-Yeon;Lee, Hyun-Joo;Kim, Hoon-Sik;Jung, Hyun-Wook;Choi, Dae-Ki
    • Clean Technology
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    • v.13 no.1
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    • pp.79-84
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    • 2007
  • Separation of ethylene from ethane and propylene from propane have been conducted using facilitated olefin transport membrane with SPEEK-Ag (Ag substituted sulfonated poly(ether ether ketone)). SPEEK was prepared by the sulfonation of PEEK using cone. $H_2SO_4$ and the reaction time affected the degree of sulfonation (DS) of the resulting SPEEK. SPEEK-Ag composite membrane was formed by soaking SPEEK in the polyester support into the Ag salt solution. With increasing the concentration of SPEEK in MeOH, the thickness of SPEEK on the polyester increased. The selectivity and the flux of SPEEK-Ag membrane for the separation of ethylene/ethane and propylene/propane were changed by the thickness of SPEEK layer on the top of polyester support. The anion of silver salt also affects the membrane performance.

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Isoprene/n-pentane separation using facilitated transport membranes with SPEEK-AgNO3 (SPEEK-AgNO3로 이루어진 촉진 수송 분리 막을 사용한 isoprene/n-pentane 혼합물 분리)

  • Choi, Hyun Woo;Kim, Dong Bum;Kim, Hoon Sik;Lee, Chang Ha;Choi, Dae Ki
    • Clean Technology
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    • v.10 no.3
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    • pp.169-176
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    • 2004
  • Sulfonated ionomer membranes, sulfonated poly(ether ether)ketone (SPEEK)-$AgNO_3$, were prepared and tested for separation of the isoprene/n-pentane mixtures. The facilitated transport membranes showed good selectivity and permeance of isoprene over n-pentane and long-term stability. Depending on various reaction conditions, the degree of sulfonation (DS) of SPEEK was measured by 1H NMR spectroscopy and the performance of the membranes was affected by the DS of SPEEK as a whole. As the DS of SPEEK was increased, the selectivity of isoprene over n-pentane increased and eventually reached a maximum selectivity of 850 ~ 900 and the stability of that was continued more than 100 h.

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Characteristics of Proton Exchange Membrane Fuel Cells(PEMFC) Membrane and Electrode Assembly(MEA) Using Sulfonated Poly(ether ether ketone) Membrane (sPEEK 막으로 제조한 고분자전해질 연료전지(PEMFC) 막전극합체(MEA)의 특성)

  • Lee, Hye-Ri;Lee, Se-Hoon;Hwang, Byung-Chan;Na, Il-Chai;Lee, Jung-Hun;Oh, Sung-June;Park, Kwon-Pil
    • Korean Chemical Engineering Research
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    • v.54 no.2
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    • pp.181-186
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    • 2016
  • Recently, there are many efforts focused on development of more economical non-fluorinated membranes for use in PEMFCs (Proton Exchange Membrane Fuel Cells). In this study, characteristics of sulfonated Poly(ether ether ketone) (sPEEK) were compared according to degrees of sulfonation (DS), relative humidity, cell temperatures at PEMFC operation condition. I-V polarization curve, hydrogen crossover, electrochemical surface area, membrane resistance and charge transfer resistance were measured. sPEEK membrane showed high performance at high DS, high temperature and high relative humidity, in particular, performance of sPEEK membrane decreased largely due to low ionic conductivity at low DS and low relative humidity.

Development and Characterization of Polymer Electrolyte Membranes Containing Polysilsesquioxane Spheres (Polysilsesquioxane 구를 함유하는 고분자 전해질 막 제조 및 특성 연구)

  • Hong Seong Uk;Cheon Hun Sang;Kim Young Baik;Park Hun Hwee
    • Membrane Journal
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    • v.15 no.1
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    • pp.1-7
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    • 2005
  • Polymer electrolyte membranes containing polysilsesquioxane (PSQ) spheres were prepared with the blend of sulfonated poly(ether ether ketone) (SPEEK) (60%) and poly(ether sulfone) (PES) (40%). The amount of PSQ spheres was fixed at 10 wt%. The prepared polymer electrolyte membranes were characterized in terms of methanol permeability, proton conductivity, and ion exchange capacity. In all cases, both methanol permeability and proton conductivity of the polymer electrolyte membranes containing PSQ spheres were lower than the values of Nafion 117 and higher than those of SPEEK/PES (6:4) blend without PSQ spheres. The experimental results indicated that the polymer electrolyte membranes containing MS64 and VTMOS spheres were the best choice in terms of the ratio of proton conductivity to methanol permeability.