• Polymer(Korea)
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• v.25 no.1
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• pp.90-97
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• 2001

Dispersions are prepared from poly(ethylene-co-acrylic acid) (PEAA) ionomer with two different counter-ions, ammonium and sodium. The diffusional characteristic of urea aqueous solution are measured for the films prepared from the above mentioned dispersions. It is attempted to find the relationship between diffusional behavior and various chemical and physical characteristics of films. DSC is employed to characterize glass transition temperature and degree of crystallinity and the structural features of crystal phase and ionic clusters are examined by WAXD and FTIR. The diffusional characteristics of ionomer is found to be dependent on various parameters such as the size of initial dispersion as well as the kind of counter ion and the degree of neutralization.

• Membrane Journal
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• v.33 no.5
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• pp.248-256
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• 2023

Indium tin oxide (ITO) transparent electrode film has been widely adopted for the various applications such as display and electric vehicle. In this paper, we studied how to enhance the thermoforming stability of ITO film by applying the highly conductive Poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS) thin layer. Based on the change of sheet resistance value, the influence of the additional solvent with different boiling point was investigated for the PEDOT:PSS coating solution. In addition, by analyzing optical transmittance and Raman spectrum, we confirmed the key mechanism which determine the final electrical conductivity of the PEDOT:PSS on ITO film using an ethylene glycol solvent. The final ITO transparent electrode coated with PEDOT:PSS performed the outstanding endurance of electrical conduction even in 126% stretching condition.

• Polymer(Korea)
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• v.37 no.3
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• pp.316-322
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• 2013

In this study, poly(ethylene terephthalate) (PET) was treated with fluorination and ultrasonic washing treatment for hydrophilic modification of PET film. We measured the change of surface modified PET film surface characteristics using contact angle, surface free energy, FE-SEM, AFM and XPS. After direct fluorination and ultrasonic washing treatment, the water contact angle was measured to be $10.81^{\circ}$, 85% reduction compared to the untreated PET film. Total surface free energy has been measured to be $42.25mNm^{-1}$, 650% increase compared to the untreated PET film. Also RMS roughness has been measured to be 1.965 nm, 348% increase compared to the untreated PET film. Hydrophilic functional group C-OH bond concentration has increased approximately 3 times. These results are attributed to the hydrophilic functional group and cavitation due to chemical etching. From this result, it was suggested that the fluorination-ultrasonic washing treatment method could be useful to make PET film surface hydrophilic.

• Polymer(Korea)
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• v.39 no.3
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• pp.461-467
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• 2015

This paper reports the combined effects of the triblock copolymer surfactant poly(ethylene glycol)-poly(propylene glycol)-poly(ethylene glycol) (PEG-PPG-PEG) and imidazole on the opto-electrical and mechanical properties of poly(3,4-ethylenedioxythiophene) (PEDOT)-based thin films prepared via vapor phase polymerization (VPP) using ferric p-toluenesulfonate as a catalyst. Various PEDOT-based thin films were synthesized using PEG-PPG-PEG and imidazole alone and in combination to compare and correlate their effects on film properties. The improved conductivity of the PEDOT films was higher than $1300S{\cdot}cm^{-1}$ when the surfactant and imidazole were used together. The PEG-PPG-PEG chain length was also varied to identify the best conditions for the VPP-based preparation of PEDOT thin films.

• The Transactions of The Korean Institute of Electrical Engineers
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• v.59 no.12
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• pp.2230-2234
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• 2010

This paper deals with the change of surface potential decay, surface resistivity, contact angle and XPS of ultraviolet-treated PET films. From the experimental results on the surface potential decay of UV degraded-samples, it was found that the accumulation of charge is decreased and the surface potential decay time is shortened. Also, from the result of XPS, it was found that the changes affected by the surface degradation of PET film were caused by the generation of carboxyl groups through the chain decomposition and recombination with oxygen molecules in the air.

• Journal of the Korean Institute of Electrical and Electronic Material Engineers
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• v.16 no.12
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• pp.1125-1130
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• 2003

The electrophoretic deposition method using the suspension solution with additives under the electric potential was applied for the fabrication of YBCO superconductor wire. This method was able to simplify the fabrication facilities, and produce an uniform and dense thick film. To improve the critical current density of deposited films, the additive PEGs(Poly Ethylene Glycole) with the molecular weight of 600, 1000 and 3400 were used as chemical binders for the suspension solution. The organic additive (PEG) showed better effects to the properties of YBCO superconductor wire. The PEG improved the adhesion between superconductor particles and suppressed the crack on the surface, which enhanced the surface uniformity and density of YBCO deposited film. It was found that acetone suspension solution showed better deposition properties than the others. The samples fabricated in the solution with the additive, 8 vol.% of 1% PEG(1000), showed the highest critical current density measured as 2300∼2400 A/$\textrm{cm}^2$ at 77 K, 0 T.

• Journal of the Korean Society of Safety
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• v.16 no.3
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• pp.61-67
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• 2001

In this study the electrical and mechanical characteristics of PET films ore analyzed after plasma surface treatment. After plasma treatment, the surface potential decay, surface potential and dielectric property were evaluated to analyze the electrical insulating property, and the tensile strength was measured as the mechanical characteristic. When plasma treatment was conducted for less than 10 minutes, it was found that the electrical insulating property was improved through evaporation of low molecular weight materials md cleaning of surface. However, for more than 10 minutes, the insulating property of plasma treated PET films was decreased due to excessive discharge energy. The tensile strength was hardly changed by Plasma treatment.

• Proceedings of the KIEE Conference
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• 2000.07c
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• pp.1587-1589
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• 2000

In this paper the weight loss, surface potential decay, surface resistivity and dielectric constant are measured to investigate the surface properties, insulation characteristic changes of PET film according to the discharge treatment. As a result of the test, up to the 10[min] the surface potential decay and surface resistivity have increased. Also, from the result of dielectric constant has decreased. On the other hand, the insulation characteristic of PET film have decreased after 10[min] in the discharge treatment.

• Proceedings of the Korean Society for Bio-Environment Control Conference
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• 1998.10a
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• pp.99-102
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• 1998

우리나라 윈예생산 시설의 피복에 사용되는 피복자재는 값이 싸고 설치가 쉬우며 비교적 광투과율이 높고 시설에 피복할 경우 긴밀도가 뛰어나 보온력이 우수한 플라스틱 필름이 99 % 이상을 차지하고 있다. 최근에 플라스틱 필름의 종류는 다양하게 발전하여 소재는 PE(polyethylene), EVA(ethylene vinylacetate), PVC(polyvinylchloride), 등의 연질필름과 PET(poly ethylene terephthalate) 그리고 ETFE(ethylene tetrafluoride ethylene) 등의 반경질핌름으로 되어 있다. (중략)

• Journal of Pharmaceutical Investigation
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• v.33 no.3
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• pp.163-169
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• 2003

In order to develop a film-forming transdermal drug delivery system, polyurethane (PU) based on poly(ethylene glycol) and poly(tetramethylene oxide) was synthesized and characterized. The synthesized PU was blended with Gantrez ES 225 (GT) to improve the adhesion property of film-forming agent to the skin. When film-forming gel formulation containing 3% ketoprofen (KP) was applied, transparent thin film was obtained within 5 minutes and adhered to the skin for 8 hours. In vitro percutaneous absortion studies were performed to determine the rate of ketoprofen absorption through guinea pig skin. A prominent effect of limonene on the skin permeability of ketoprofen was observed among the various skin permeation enhancers investigated. Considering mechanica properties of film and skin permeability of ketoprofen, 2% of limonene was optimal content in the film forming transdermal formulation.