• Title/Summary/Keyword: polyethersulfone film

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Effect of Chain Orientation on the Optical Properties and Dimensional Stability of Polyethersulfone Film (주사슬 배향이 폴리에테르설폰 필름의 광학 특성 및 치수안정성에 미치는 영향)

  • Kim, Jae-Hyun;Kim, In-Sun;Kim, Yang-Kook;Kang, Ho-Jong
    • Polymer(Korea)
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    • v.34 no.3
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    • pp.220-225
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    • 2010
  • The optical properties and dimensional stability of polyethersulfone(PES) retardation film have been studied as function of chain orientation and the temperature applied to PES retardation film. It was confirmed that the appropriate retardation values of $R_e$ and $R_{th}$ for the retardation film application were able to obtain by the chain orientation and these values could be controlled by the chain relaxation through the thermal annealing process. It was found that unstable $R_e$ and $R_{th}$ values were shown by the repeated cooling and heating applied to the retardation films but this could be stabilized by means of the annealing process after stretching of PES film. The dimensional shrinkage due to the chain orientation was found as temperature increase and the intrinsic thermal expansion of PES appeared after shrinking. The shrinkage of PES films affected by the chain orientation and thermal annealing dramatically but the effect on the coefficient of thermal expansion was found to be negligible.

Electrical Properties of PVP Gate Insulation Film on Polyethersulfone(PES) and Glass Substrates (Polyethersulfone(PES) 및 유리 기판위에 제작된 PVP 게이트 절연막의 전기적 특성)

  • Shin, Ik-Sup;Gong, Su-Cheol;Lim, Hun-Seoung;Park, Hyung-Ho;Chang, Ho-Jung
    • Journal of the Microelectronics and Packaging Society
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    • v.14 no.1
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    • pp.27-31
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    • 2007
  • The cpapcitors with MIM(metal-insulator-metal) structures using PVP gate insulation films were prepared for the application of flexible organic thin film transistors (OTFT). The co-polymer organic insulation films were synthesized by using PVP(poly-4-vinylphenol) as a solute and PGMEA(propylene glycol monomethyl ether acetate) as a solvent. The cross-linked PVP insulation films were also prepared by addition of poly(melamine-co-formaldehyde) as thermal hardener. The leakage current of the cross- linked PVP films was found to be about 1.3 nA on Al/PES(polyethersulfone) substrate, whereas, on ITO/ glass substrate was about 27.5 nA indicating improvement of the leakage current at Al/PES substrates. Also, the capacitances of all prepared samples on ITO/glass and Al/PES substrates w ere ranged from 1.0 to $1.2nF/cm^2$, showing very similar result with the calculated capacitance values.

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Alcohol Gas Sensors using Spray-coated Carbon Nanotube Thin Film (스프레이 코팅된 탄소나노튜브 박막을 이용한 알코올 가스 센서)

  • Kim, Seong-Jeen
    • Journal of the Korean Institute of Electrical and Electronic Material Engineers
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    • v.21 no.9
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    • pp.783-788
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    • 2008
  • We suggest a CNT-based gas sensor for breath alcohol measurement. The sensor was composed of single-walled carbon nanotubes (SWCNTs) thin film on flexible PES (polyethersulfone) substrate, and the SWCNTs thin film was formed by multiple spray-coating with SWCNTs solution which was well-dispersed, highly controlled and functionalized in ethanol solvent. In this work, three types of SWCNTs thin films were deposited with changes in the number of spray-coatings to 20, 40 and 60 times in order to compare electrical response properties of the SWCNTs thin films. from the fabricated sensors, conductance and capacitance responses were measured and discussed. Alcohol gas sensors have been commercialized widely as gauge for breath alcohol measurement which is applicable to checking whether car drivers are drinking-driving or not. Our alcohol gas sensors showed good sensitivity and linearity even at room temperature.

Optimized Synthesis Conditions of Polyethersulfone Support Layer for Enhanced Water Flux for Thin Film Composite Membrane

  • Son, Moon;Choi, Hyeongyu;Liu, Lei;Park, Hosik;Choi, Heechul
    • Environmental Engineering Research
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    • v.19 no.4
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    • pp.339-344
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    • 2014
  • Different types of polyethersulfone (PES) support layer for a thin film composite (TFC) membrane were synthesized under various synthesis conditions using the phase inversion method to study the combined effects of substrate, adhesive, and pore former. The permeability, selectivity, pore structure, and morphology of the prepared membranes were analyzed to evaluate the membrane performance. The combined use of substrate, adhesive, and pore former produced a thinner dense top layer, with more straight finger-like pores. The pure water permeation (PWP) of the optimized PES membrane was $27.42L/m^2hr$ (LMH), whereas that of bare PES membrane was 3.24 LMH. Moreover, membrane selectivity, represented as divalent ion ($CaSO_4$) rejection, was not sacrificed under the synthesis conditions, which produced the dramatically enhanced PWP. The high permeability and selectivity of the PES membrane produced under the optimized synthesis conditions suggest that it can be utilized as a potential support layer for TFC membranes.

A Study on Characteristics of Tin-doped Indium Oxide Film for Polyethersulfone Flexible Substrate by Low Temperature E Beam Deposition Process (저온 E Beam 증착 공정으로 제조된 폴리에테르설폰 유연기판용 ITO 필름 특성 연구)

  • Rhew, Ju-Min;Kang, Ho-Jong
    • Polymer(Korea)
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    • v.36 no.3
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    • pp.393-400
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    • 2012
  • The characteristics of indium tin oxide (ITO) thin film deposited on polyethersulfone (PES) film by low temperature E beam has been studied for the flexible photovoltaic devices. It was found that the substrate temperature in the deposition process affected the crystallization behavior of ITO during the post low temperature annealing process. Higher substrate temperature resulted in the increase of crystallinity of annealed ITO. Consequently, the lowering of sheet resistivity and better transmittance were obtained. Crystallization of ITO during the annealing process was facilitated by using oxygen gas in the deposition process and resulted in the enhancement on sheet resistivity and transmittance of ITO. The surface roughness of PES film prohibited the crystallization of ITO during the annealing process and it caused the increase of sheet resistivity and the decrease of transmittance of ITO.

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
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    • v.14 no.1
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    • pp.9-11
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    • 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.

A Study on the Preparation of Thin-Film Composite Membrane with Polyethersulfone Supporting Membrane (역삼투 복합막 제조(II) 폴리에테르설폰막의 제조와 복합막 제조에 관한 연구)

  • 이동진;민병렬;이병철;송희열
    • Membrane Journal
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    • v.4 no.1
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    • pp.46-56
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    • 1994
  • The performane of prepared Thin-Film Composite membrane depends on supporting membrane, concentration of monomers, dipping time of supporting membrane into monomer solution, reachon time between monomers, curing temperature and time and posttreatment. This study was conducted for searching the optimal condition for making the composite membrane. For this purpose, supporting membrane and composite membrane was made under various condition and at each step were tested.

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The PL Characteristics of ZnO Thin Film on Flexible Polymer by Pulse Laser Deposition

  • Choi, Young-Jin;Lee, Cheon
    • Transactions on Electrical and Electronic Materials
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    • v.13 no.5
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    • pp.245-247
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    • 2012
  • In this study, ZnO films have been grown on PES (polyethersulfone) of flexible polymer substrate by PLD (pulsed laser deposition) and characterized for crystalline and optical properties. Growing conditions were changed with substrate temperatures ranging from 50 to $200^{\circ}C$ and laser power density ranging from 0.2 to $0.4J/cm^2$. When ZnO thin films are deposited at low temperature with a small laser power density, the (002) peaks of XRD to signify the crystal quality of ZnO thin films appear to be very weak and the (101) peaks to signify the chemical composition of oxygen and zinc are strong. The (002) peaks increase with the substrate temperature and laser power density because the energy needed for the supply of the combination regarding zinc and oxygen has increased. In this study, the best condition for growing ZnO thin film on PES is at a substrate temperature of $200^{\circ}C$ and with a laser density of $0.3J/cm^2$. The characteristics of PL were measured by UV and green luminescence.

Solvent Filtration Performance of Thin Film Composite Membranes based on Polyethersulfone Support (폴리이터설폰 지지체를 활용한 박막복합막의 용매투과특성 연구)

  • Kim, SeungHwan;Kim, YooShin;Kim, DoYong;Kim, SooMin;Kim, Jeong F.
    • Membrane Journal
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    • v.29 no.6
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    • pp.348-354
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    • 2019
  • Recently, the application range of organic solvent nanofiltration (OSN) technology has been expanding, requiring membranes with better performance. In this work, thin film composite (TFC) OSN membrane was fabricated. First, ultrafiltration support membrane was prepared via nonsolvent-induced phase separation (NIPS) technique using polysulfone (PSf) and polyethersulfone (PES). Then, the effect of pore forming additives such as polyvinylpyrrolidone (PVP) and pluronic F-127 were employed to improve the membrane permeance. The well-known interfacial polymerization technique was employed using MPD-TMC chemistry to form a thin film on top of the fabricated support, and its solvent permeance and nanofiltration performance was characterized. It was found that polyethersulfone support exhibited more reliable performance compared to polysulfone, and PVP additive was more effective compared to Pluronic F-127. As for the oSN performance, polar aprotic solvents like acetonitrile show significantly higher flux (986.5 L·m-2·h-1·bar-1) compared to water and EtOH (9.5 L·m-2·h-1·bar-1).

Effect of the Structure of the Smallest Poresize Layer on the Permeability of PES Microfiltration Membranes (최소 기공층 구조가 PES계 정밀여과막 투과 성능에 미치는 영향)

  • Kim, No-Won
    • Membrane Journal
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    • v.19 no.1
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    • pp.25-33
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    • 2009
  • PES (polyethersulfone) membranes with highly enhanced their asymmetry were prepared by phase inversion process. The membranes were prepared by using PES/DMF (N,N-dimethylformamide)/TSA (p-toluenesulfonic acid)/PVP (polyvinylpyrrolidone) casting solution and water coagulant. The pre-coagulation of membrane surface which was induced by an addition of TSA as a demixing agent and PVP as a swelling polymer in the PES solution and humid exposure time, played a crucial role in determining morphological properties and the PWP (pure water permeation) performance. The PES solution was coated on polyester film under condition of 80% humidity for a while ($72{\sim}144$ sec) before immersing in a coagulation bath. The characterization of membranes was carried out by a capillary flow porometer, a FE-SEM and a permeation test apparatus. As the thickness of the smallest pore size layer (SPL) decreased, the asymmetry of membrane increased under conditions of 20 wt% of TSA and 10 wt% of PVP in 11 wt% of PES solution during longer humid contact time. As a result, the membranes showed a remarkable increase of PWP.