• Title, Summary, Keyword: polyethersulfone

Search Result 147, Processing Time 0.039 seconds

Structure and Properties of Cation Exchange Membrane made of Sulfonated Polyethersulfone

  • Nah, Sung-Soon;Lee, Sung-Min;Ryul, Min-Byung;Lee, Chang-So
    • Proceedings of the Membrane Society of Korea Conference
    • /
    • /
    • pp.115-115
    • /
    • 1999
  • In this work a new process was developed for the sulfonation of the chemicallly stable engineering polymer polyethersulfone as membrane materials for electrodialysis or a flow battery applications. Commercially available polyethersulfone polymer was partially sulfonated using a CSA sulfonating agent in a dichloromethane solvent, which sulfonated polyethersulfone with various sulfonation levels have been prepared. Sulfonated polyethersulfone (SPES) membranes with different ion capacities were prepared for the purpose of identifying cation exchange membrane properties, in an attempt to find a low cost replacement for Nafion, which most of the perfluorinated membranes, known to exhibit a prolonged service life, are expensive and difficult to process. The following features were determined: the degree of sulfonation, water uptake, thermal analysis, and electrochemical properties such as ion exchange capacities, resistivity, selectivity of ion permeation. The surface of the cation exchange membranes, decomposed with the H202-treatment, were observed by using scanning electron microscope. The area resistivities of SPES mebranes in 5N-NaOH decreased from $2,150{\;}{\Omega}-cm2$ to less than $15{\Omega}-cm2$ as the ion exchange capacity (IEC) increased from 0.62 to 1.73 millieequivlants per dry gram(meq/dg).eq/dg).

  • PDF

Sulfonated Polyethersulfone 의 합성과 특성

  • 김인철;전종영;탁태문
    • Proceedings of the Membrane Society of Korea Conference
    • /
    • /
    • pp.40-41
    • /
    • 1996
  • 기존에 membrane의 소재로 사용되어 왔던 Polyethersulfone은 막 제조 특성이 우수하고 여러 가지 환경에 대한 저항성이 뛰어나서 많이 이용되어 왔지만 소수성을 띠므로 농도분극과 fouling등 많은 문제점을 안고 있다. 이런 문제점을 극복하기 위하여 친수성의 도입, 물리적, 화학적 세척등 여러 가지 방법을 사용하고 있고 본 연구에서는 hydrophobic Polyethersulfone에 hydrophilic Sulfonate group(-SO$_3$H)을 도입하여 이와같은 문제를 극복하고자 했다. 본 연구에서 사용한 sulfonating agent로는 Chlorosulfonic acid (in CCl$_4$)를 사용하였다.

  • PDF

Studies on the $N_2/SF_6$ Permeation Behaviors Using the Polyethersulfone Hollow Fiber Membranes (폴리이서설폰 중공사 막을 이용한 $N_2/SF_6$ 투과거동에 관한 연구)

  • Lee, Hyung-Keun;Kim, Dae-Hoon;An, Young-Mo;Jo, Hang-Dae;Park, Jong-Soo
    • Membrane Journal
    • /
    • v.19 no.3
    • /
    • pp.244-251
    • /
    • 2009
  • In this research the polyethersulfone hollow fiber membrane was used to separate Sulfur Hexafluoride ($SF_6$) which is the one of the six greenhouse gases from Air ($N_2$). The effects of the non-solvent (Acetone, Ethanol) type, air-gap and post-treatment (surface silicon coating) were investigated by the structure and performance of the membranes. The structure change of the membrane was examined by scanning electron microscope. The single gas permeation using $N_2$, $SF_6$ through the membrane surface coated with silicon showed maximum 7.64 perm-selectivity improved 3.4 times.

Preparation and Characteristics of Polyethersulfone Microfiltration Membranes (폴리에테르술폰 정밀여과막의 제조 및 특성 연구)

  • Kim, No-Won
    • Membrane Journal
    • /
    • v.17 no.4
    • /
    • pp.329-337
    • /
    • 2007
  • This is the research about a new method to make the internal separation layer with smallest pore size in polyethersulfone (PES) membrane by adding p-toluenesulfonic acid (TSA) and polyvinylpyrolidone (PVP) to polymeric PES solution. The preparation and morphological characterization of PES sheet membranes containing PVP as a hydrophilic swelling material and TSA as a demixing material were performed. As a result by microflow porometery, the PVP and TSA added PES membranes showed good permeabilities and narrow pore size distributions, comparable to those of the commercial membranes. The concentration of PVP affected the PES characteristics on air permeability and surface structure. The concentration of TSA influenced on pore size distribution but do not affect air permeability. The surface images of FE-SEM shows similar pore size when TSA added or not. However, the cross-section images of FE-SEM show that the TSA added PES membranes have a increase of internal layer thickness with smallest pore size.

Preparation and Characterization of Mixed Matrix Membrane Consisting of Polyethersulfone and ZnO Nanoparticles (Polyethersulfone과 ZnO 나노입자로 조성된 혼합기질막의 제조와 특성 평가)

  • Lee, Seung-Hun;Lee, Min-Su;Youm, Kyung-Ho
    • Membrane Journal
    • /
    • v.26 no.6
    • /
    • pp.463-469
    • /
    • 2016
  • In this research, a new expectation in enhancing the PES (polyethersulfone) polymer phase inversion membrane performances with nanoparticles is proposed by using ZnO. This paper investigated the synthesis of PES phase inversion membranes including ZnO nanoparticles and evaluates the performance of these mixed matrix membranes. The PES-ZnO mixed matrix membranes were fabricated by phase inversion method using the PES-ZnO-NMP(N-methyl-1-pyrrolidone) casting solutions with low ZnO nanoparticles content of 0.375 wt%. The influence of ZnO nanoparticles on the characteristics of PES-ZnO mixed matrix membranes was investigated with scanning electron microscope observations of membrane cross-sections, contact angle measurements, tensile strength measurements, pure water flux measurements and ultrafiltration experiments of BSA solution. Those results showed that the performance advancements in comparison with the pure PES membrane without ZnO in terms of increasing hydrophilicity as well as reducing membrane fouling by adding ZnO nanoparticles even in low concentration.

Preparation and characterization of cation exchange membrane using Sulfonated Polyethersulfone (Sulfonated Polyethersulfone을 이용한 양이온교환막의 제조와 특성화)

  • 김학경;나성순;이성민;민병렬
    • Proceedings of the Membrane Society of Korea Conference
    • /
    • /
    • pp.118-119
    • /
    • 1998
  • 이온교환막은 내부세공에 양이온이나 음이온이 막물질의 일부로서 고정된 구조를 가지고 있어 보통의 격막에서는 볼 수 없는 특징을 가지고 있으며 바닷물의 농축에 의한 소금의 제조, 탈염에 의한 공업용수 및 음료수의 제조, 도금공장의 폐수처리, 식품과 의\ulcorner품공자, 고체 고분자 전해질(solid polymer electrolyte)에 근거한 수소생성 등에서 폭넓게 응용되고 있다. 본 연구에서는 상용막에 대체가능한 이온교환막을 제조하기 위하여 내열성, 내약품성, 내산성과 우수한 기계적성질 등을 가지고 있어 membrane 소재로 널리 사용되는 polyethersulfone(PES)를 술혼화시켜 sulfonated PES를 합성한 후 양이온 교환막을 제조하여 특성을 분석하였다.

  • PDF

Preparation of cation exchange membrane by heterogeneous sulfonation of polyethersulfone and characterization (Polyethersulfone의 heterogeneous sulfonation 을 통한 양이온교환막의 제조와 특성화)

  • 오종열;나성순;김학경;민병렬
    • Proceedings of the Membrane Society of Korea Conference
    • /
    • /
    • pp.137-138
    • /
    • 1997
  • 1. 서론 : 이온교환막이란 합성 폴리머의 이온교환수지를 막상으로 만든 것으로 고분자 매트릭스에 특정 전하가 고정되어 있어 이러한 성질 때문에 보통의 격막에서는 볼 수 없는 특징을 가지고 있으며 바닷물의 농축에 의한 소금의 제조, 탈염에 의한 공업용수 및 음료수의 제조, 도금공장의 폐수처리, 식품과 의약품공업, 고체 고분자 전해질에 근거한 수소생성 등에서 폭넓게 이용되고 있다. 본 연구에서는 상용막에 대체가능한 이온교환막을 제조하기 위하여 내열성, 내약품성, 내산성과 우수한 기계적성질 등을 가지고 있어 membrane 소재로 널리 사용되는 polyethersulfone(PES)를 술폰화시켜 sulfonated PES를 합성한 후 양이온 교환막을 제조하여 특성을 분석하였다.

  • PDF

Properties of AZO/Ag/AZO Multilayer Thin Film Deposited on Polyethersulfone Substrate

  • Jung, Yu Sup;Park, Yong Seo;Kim, Kyung Hwan;Lee, Won-Jae
    • Transactions on Electrical and Electronic Materials
    • /
    • v.14 no.1
    • /
    • pp.9-11
    • /
    • 2013
  • The AZO/Ag/AZO multilayer films were deposited on polyethersulfone (PES) substrate by using facing target sputtering methods at room temperature. The AZO/Ag/AZO multilayer films with polymer substrate had advantages, such as low sheet resistance, high optical transmittance in visible range and stable mechanical properties. From the results, the AZO/Ag/AZO multilayer films (50/12/50 nm) demonstrated a sheet resistance of 11 ${\Omega}/{\square}$ and average transmittance of 87% in visible range (wavelength of 380-770 nm). Moreover, the multilayer showed stable mechanical properties compared to the single-layered AZO sample during the bending test due to the existence of the ductile Ag metal layer.

Preparation and characterization of polyethersulfone mixed matrix membranes embedded with Ti- or Zr-incorporated SBA-15 materials

  • Guo, Jing;Sotto, Arcadio;Martin, Antonio;Kim, Jeonghwan
    • Journal of Industrial and Engineering Chemistry
    • /
    • v.45
    • /
    • pp.257-265
    • /
    • 2017
  • Functionalized SBA-15 mesoporous materials were newly developed and embedded as inorganic additive into polyethersulfone (PES) membrane. Doping the SBA-15 mesoporous materials improved membrane permeability without significant change in morphological structure of PES membrane. However, low dosage of SBA-15 of 0.3 wt.% increased fouling rate of PES membrane with BSA compound. The fouling potential in PES membrane was reduced by increasing concentration of SBA-15 materials to 0.6 wt.%. Antifouling properties of PES membrane were associated with lower BSA membrane adsorption due to the improvement of membrane hydrophilicity by SBA-15 addition.