• Title/Summary/Keyword: poly(styrene sulfonate)

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Preparation and Structure of the Synthetic Polymeric Membranes based on Polystyrene and Poly(sodium 4-styrene sulfonate) (Polystyrene과 Poly(sodium 4-styrene sulfonate)를 이용한 합성 고분자 분리막의 제막 및 구조)

  • 변홍식;탁태문
    • Membrane Journal
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    • v.6 no.4
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    • pp.273-283
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    • 1996
  • A cation-exchange membranes were prepared by polystyrene and poly(sodium 4-styrene sulfonate). The degree of crosslinking of polystyrene membranes was controlled by DVB. At the same time, the structure of PS membranes was changed from RO to MF by varying the concentration of PSS in the casting solution. Water flux increased with PS-PSS membranes due to the sulfonate groups, and final membrane cast from the solution containing 5% of DVB and 3% of PSS showed MF structure.

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Study on Binders for Preparing Antistatic Films of PEDOT/PSS (대전방지 PEDOT/PSS 필름 제조를 위한 바인더에 관한 연구)

  • Kim, Seok Jun;Park, Wan-Su;Hwang, Jung Seok;Pak, Na Young;Choi, Young Ju;Chung, Dae-won
    • Applied Chemistry for Engineering
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    • v.26 no.4
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    • pp.458-462
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    • 2015
  • It is essential to employ a binder to prepare transparent films from conductive polymer such as poly(3,4-ethylenedioxythiophene)-poly(styrene sulfonate) (PEDOT/PSS). In this paper, poly(vinyl alcohol) (PVA), poly(vinyl pyrrolidone) (PVP), and PSS were selected as a binder, and their effects were investigated. The formation of the film was found to be primarily dependent on the surface tension of coating solution including PEDOT/PSS and a binder. When PSS was used as a binder, the film was not formed. In case of using PVP, it was easily peeled off from the substrate. However, when using the PVA or the mixtures of PVA and PSS or PVA and PVP as a binder, films with good transparency and uniform surface resistances were produced. Based on adhesion and long-term stability tests, we concluded that the mixture of PVA and PSS is the best binder for preparing antistatic films of PEDOT/PSS.

Preparation and Characterization of PEDOT/PSS Hybrid with Graphene Derivative Wrapped by Water-soluble Polymer (수용성 고분자로 Wrapping된 그래핀 치환체와 PEDOT/PSS 복합체의 합성 및 특성)

  • Park, No Il;Lee, Seul Bi;Lee, Seong Min;Chung, Dae-Won
    • Applied Chemistry for Engineering
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    • v.25 no.6
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    • pp.581-585
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    • 2014
  • We conducted investigation on the hybridization of poly(3,4-ethylenedioxythiophene)/poly(styrene sulfonate) (PEDOT : PSS) with graphene derivative (G-PSS), which has been prepared by wrapping reduced graphene oxide (RGO) with PSS. In situ polymerization of PEDOT/PSS in the presence of G-PSS afforded the PEDOT/PSS and graphene hybrid (GP). The analysis of XPS, IR and Raman spectroscopies for GP showed that PEDOT/PSS was successfully synthesized and hybridized with graphene. Compared to the G-PSS, GP showed an enhanced electrical conductivity of $4.46{\times}10^2S/m$ with a good wter-dispersity.

Preparation and Application Characteristics of Carboxylated Styrene Butadiene Latex for Latex Modified Concrete (라텍스 개질 콘크리트용 Carboxylated Styrene Butadiene 라텍스의 제조와 적용 특성)

  • Lee, Bong-Kyu;Ju, Chang-Sik
    • Korean Chemical Engineering Research
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    • v.50 no.6
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    • pp.1076-1081
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    • 2012
  • For the purpose of development of the latex suitable for latex modified concrete, experimental researches on the preparation of carboxylated styrene butadiene latex by the method of the two-step emulsion polymerization and application to concrete were performed. Sodium dodecylbenzene sulfonate and sodium salt of lauryl sulfonate were selected as anionic emulsifiers, and nonylphenoxy poly(ethyleneoxy) ethanols (n=10, 20, 40) as latex stabilizer. Potassium persulfate and sodium bisulfite were used as redox initiator, besides $Na_2HPO_4$ and $K_2CO_3$ as electrolytes. Polymerization recipe of latex suitable for latex modified concrete were suggested from the experimental researches on the effects of anionic emulsifiers and their concentration on the polymerization stability, and the effect of electrolytes concentration on the particle size of latex. Physical properties, such as slump, air contents, compressive and flexural strength, of latex prepared by suggested polymerization recipe were examined. The experimental results showed that latex modified concrete satisfied the quality standards in slump and air contents. Furthermore, it was turned out that the compressive and the flexural strength of latex modified concrete with 28 days curing time showed appreciably improvements.

The Preparation of Poly(N-methylpyrrole) Bilayers with Entrapped Anthraquinone-2-sulfonate

  • 표명호;김현수
    • Bulletin of the Korean Chemical Society
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    • v.18 no.11
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    • pp.1195-1199
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    • 1997
  • Anthraquinone-2-sulfonate (AQS) release from poly(N-methylpyrrole anthraquinone-2-sulfonate) (PNMP-AQS) was investigated at open circuit and compared with electrochemically stimulated release during potential cycling. It was found that the fast AQS release from PNMP-AQS single layers is substantially retarded and the amounts of spontaneously and electrochemically releasable AQS can be reduced by constructing bilayers, consisting of PNMP-AQS inner layers and PNMP outer layers. PNMP-Cl outer layers exhibited higher effectiveness for entrapping AQS within inner layers than PNMP/poly(styrene slfonate). The effects of outer layer thicknesses on AQS release were also examined with PNMP-AQS:PMP-Cl. The electroactivity enhancement of PNMP-AQS:PNMP-Cl bilayers due to entrapped AQS was confirmed by chronocoulometry.

Indium Tin Oxide-Free Large-Area Flexible Organic Light-Emitting Diodes Utilizing Highly Conductive poly(3,4-ethylene dioxythiophene):poly(styrene sulfonate) Anode Fabricated by the Knife Coating Method (나이프 코팅 법으로 제작한 ITO-Free 고전도성 PEDOT:PSS 양극 대면적 유연 OLED 소자 제작에 관한 연구)

  • Seok, JaeYoung;Lee, Jaehak;Yang, MinYang
    • Journal of the Korean Society of Manufacturing Technology Engineers
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    • v.24 no.1
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    • pp.49-55
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    • 2015
  • This paper reports solution-processed, high-efficiency organic light-emitting diodes (OLEDs) fabricated by a knife coating method under ambient air conditions. In addition, indium tin oxide (ITO), traditionally used as the anode, was substituted by optimizing the conductivity enhancement treatment of poly(3,4-ethylene dioxythiophene):poly(styrene sulfonate) (PEDOT:PSS) films on a polyethylene terephthalate (PET) substrate. The transmittance and sheet resistance of the optimized PEDOT:PSS anode were 83.4% and $27.8{\Omega}/sq$., respectively. The root mean square surface roughness of the PEDOT:PSS anode, measured by atomic force microscopy, was only 2.95 nm. The optimized OLED device showed a maximum current efficiency and maximum luminous density of 5.44 cd/A and $8,356cd/m^2$, respectively. As a result, the OLEDs created using the PEDOT:PSS anode possessed highly comparable characteristics to those created using ITO anodes.

Part 1 : Soap-Free Emulsion Copolymerization of Styrene with COPS-I (Part 1 : Styrene과 COPS-I의 무유화공중합)

  • Lee, KiChang;Choo, HunSeung;Ha, JeongMi
    • Journal of Adhesion and Interface
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    • v.15 no.3
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    • pp.93-99
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    • 2014
  • Monodisperse poly[styrene-co-(COPS-I)] latices in the size range of 165~550nm were successfully prepared by soap-free emulsion polymerization with various polymerization conditions (Styrene, COPS-I, KPS, DVB concentrations and polymerization temperature). In general, the COPS-I and KPS, DVB concentrations and polymerization temperature were closely related to the polymerization rate and the number of particles, molecular weight, and zeta potential. The polymerization rate and zeta potential increased, but molecular weight decreased, with increasing in the number of particles.

Preparation and Application Characteristics of Carboxylated Styrene Butadiene Latex for Polymer Cement Mortar (폴리머 시멘트 몰타르 포장재용 Carboxylated Styrene Butadiene 라텍스의 제조와 적용 특성)

  • Lee, Bong-Kyu;Ju, Chang-Sik
    • Korean Chemical Engineering Research
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    • v.50 no.5
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    • pp.789-794
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    • 2012
  • For the purpose of development of the latex suitable for polymer cement mortar, experiments on the preparation of carboxylated styrene butadiene latex by the method of the two-step emulsion polymerization were performed. Methyl methacrylate, methacrylic acid and acrylic acid were selected as carboxylic co-monomer, styrene and butadiene as monomer, sodium dodecylbenzene sulfonate and sodium salt of lauryl sulfonate as anionic emulsifiers, and nonylphenoxy poly (ethyleneoxy) ethanol (n=10, 20, 40) as latex stabilizer. Potassium persulfate and sodium bisulfite were also used as redox initiator, and sodium monohydrogen phosphate and potassium carbonate as electrolytes. The effects of categories and concentration of carboxylic co-monomer, molecular weight control agent, crosslinking agent, and styrene/butadiene monomer ratio on the characteristics of latex were investigated. Polymerization recipes for preparation of polymer cement mortar could be proposed. The prepared latexes were tested for the physical properties such as compressive and flexural strength when latexes were mixed with cement mortar. The results showed that the latex could be adapted to polymer cement mortar. Also, it was recognized that the compressive and flexural strength were exhibited 25.4% and 45.3% respectively higher improvement than the quality standards at 28 days curing time.

A Study on Improving Electrical Conductivity for Conducting Polymers and their Applications to Transparent Electrodes (전도성 고분자의 전기전도도 향상 연구 및 이를 이용한 투명전극 응용)

  • Im, Soeun;Kim, Soyeon;Kim, Seyul;Kim, Felix Sunjoo;Kim, Jung Hyun
    • Applied Chemistry for Engineering
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    • v.26 no.6
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    • pp.640-647
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    • 2015
  • As the need for next-generation flexible electronics grows, novel materials and technologies that can replace conventional indium tin oxide (ITO) for transparent electrodes have been of great interest. Among them, a conducting polymer, especially poly(3,4-ethylenedioxythiophene) : poly(styrene sulfonate) (PEDOT : PSS) is one of the most promising candidates because it is mechanically flexible, inexpensive, and capable of being processed in solution. Currently, there are a lot of research efforts on enhancing its electrical conductivity to the level of ITO or metal electrodes through chemical and/or physical processing. In this review article, we present various additives and pre-/post-deposition processing methods for improving the electrical conductivity of PEDOT : PSS. Some of representative reports are also introduced, which demonstrated the use of conductivity-enhanced PEDOT : PSS as transparent electrodes in electronics and energy conversion.