• 한국표면공학회지
• /
• 제32권3호
• /
• pp.401-405
• /
• 1999

Reflective silver films with high quality were prepared on polyester substrate by using sputter deposit on techniques. Best reflectivity thin films of silver were produced with process parameters of $10^{-6}$ Torr as base pressure, 50 W as R.F. power, 5 mTorr as working pressure, and 10 sccm as Ar flow rate. Being deposited with an R.F. power of 50 W, Ag films revealed the highest 96.3 % reflectance as illuminated with a light of 700 nm wavelength. The adhesion of sample films showed as high as 14 to $20{\;}kg/\textrm{cm}^2$, which is suitable for industrial purposes. Their film crystallinity and orientation resulted in the planes of (111) and (200) for the growth with a preferred orientation of <111>, in general. The cross-sections of thin film specimens showed columnar structures. It is noted that columns became coarsened and less dense as R.F. power increased, resulting in a low reflectivity for the product film.

• 한국표면공학회지
• /
• 제32권3호
• /
• pp.406-409
• /
• 1999

Thin films of silver with high reflectance of 95% and above were fabricated successfully on polyester substrate by using e-beam evaporation processes. The optimum process condition was investigated by varying the current values applied while keeping the substrate temperature at room temperature by circulating the cooling water around it during deposition. Thin films of silver deposited with 30 mA as current revealed the highest reflectance of 96.4%, while being illuminated with a light of 700nm wave-length. But their adhesion showed unsatisfactory results. Though the films showed a condensation type in the cross-sectional views, they revealed crystallinity in the planes of (111) and (200) and growth orientation in <100> direction.

• 한국재료학회:학술대회논문집
• /
• 한국재료학회 1997년도 한국재료학회 추계학술발표회
• /
• pp.119-119
• /
• 1997

• 한국정보디스플레이학회:학술대회논문집
• /
• 한국정보디스플레이학회 2006년도 6th International Meeting on Information Display
• /
• pp.637-640
• /
• 2006

DuPont Teijin Films (DTF) have developed engineered substrates specifically for the flexible electronics market. $Teonex^{(R)}Q65$ is a biaxially oriented crystalline polyester with a tailored surface and it is emerging as a competitive material for the base substrate in OLED displays and active matrix backplanes. Given the dimensional reproducibility requirements in the display applications, uncontrolled moisture absorption during the processing cycle could potentially be far more significant than the inherent shrinkage of the base substrate. Understanding these effects and optimising the processing steps involved in device manufacture will be critical to achieving the ultimate performance that can be achieved with the base substrate.

• 대한전기학회:학술대회논문집
• /
• 대한전기학회 2002년도 하계학술대회 논문집 C
• /
• pp.1590-1592
• /
• 2002

In this work the electrical characteristics of organic TFTs using organic insulator and flexible polyester substrate have been investigated. Pentacene and PVP(polyvinylphenol) are used as an active semiconducting layer and dielectric layer respectively. Pentacene was thermally evaporated in vacuum at a pressure of about $1{\times}10^{-6}$ Torr and at a deposition rate of $0.5{\AA}$/sec, and PVP was spin-coated. Aluminium and gold were used for gate and source/drain electrodes. 0.1mm thick flexible polyester substrate was used instead of glass or silicon wafer.

• 한국표면공학회지
• /
• 제32권3호
• /
• pp.257-264
• /
• 1999

Thin reflective films are synthesized by using PVD methods with a bright metal of Al or Ag. For purposes of improving the reflectance and adhesion of such films particularly, substrate bias was applied during sputtering (namely, ion-plating) to enhance the deposition process with higher energy. And we succeeded in fabricating a quality silver film which possesses an adhesion of $85{\;}Kg/\textrm{cm}^2$ and a high reflectivity of more than 96%. Both of reflectivity and adhesion are better in case of bias sputtering as controlled than nonbias sputtering, particularly the bias of 50-100 V showed most effective. The microstructures of sample films were examined by using various equipments and the XRD spectrum in particular showed that <111> direction is the preferred growth orientation.

• 폴리머
• /
• 제35권6호
• /
• pp.599-604
• /
• 2011

폴리에스테르 유연기판 제조를 위하여 PET-PEN 공중합체를 합성하고 이들의 형태학적 변화가 유연기판 특성에 미치는 영향을 살펴보았다. 합성된 PET-PEN 공중합체는 DMT/NDC의 조성비에 따라 공중합체 block sequence가 달라짐을 확인하였다. 공중합체에 PET-PEN과 PEN의 block sequence가 증가할수록 유리전이온도가 증가하며 이에 따라 유연기판의 치수안정성이 증가됨을 확인하였으며 DMT/NDC의 조성비가 50/50인 경우, 열팽창계수(CTE)가 최소가 됨을 확인하였다. 합성된 PET-PEN 공중합체는 광투과 특성이 80% 이상을 유지하며 1시간 동안 $280^{\circ}C$에서의 열안정성도 0.4 wt% 이내를 유지하여 유연기판으로 적용이 가능함을 알 수 있었다.

• 한국염색가공학회지
• /
• 제11권4호
• /
• pp.50-56
• /
• 1999

The adhesive properties of polyester cord in rubber matrix were investigated according to the surface modification. The polyester cord was oxidized in sodium hypochlorite solution, and graft-polymerized with acrylic acid under the irradiation with ultraviolet light, and then coated with resorcinol-formaldehyde latex (RFL). The modified surface was checked with scanning electron microscope. The adhesive properties were measured by the full-Out method, and evaluated with regard to the energy of adhesion and the maximum load. The polyester was not oxidized in sodium hypochlorite solution, so the surface was not able to etch to produce the coarse topology. As the concentration of acrylic acid and the reaction time were increased, the graft yields were also increased. It was considered that the acrylic acid would swell the polyester and diffuse easily to the inner side of substrate. The adhesive properties of polyeser to rubber matrix were affected by the surface condition. Namely, the maximum load was almost same, but the energy of adhesion was rather higher In the polyester grafted with acrylic acid than in control one. We concluded that the flexible aliphatic chains of polyacrylic acid situated in the interface of cord and rubber matrix were distributed well the stress and strain all over the filler resulting the high energy of adhesion.

• 유체기계공업학회:학술대회논문집
• /
• 유체기계공업학회 2000년도 유체기계 연구개발 발표회 논문집
• /
• pp.359-365
• /
• 2000

Port facilities and marine structures used in marine environment were encountered to corrosion damages because of the influence of $Cl^-$. Generally, to protect these accidents, mainly applied anti-corrosion paint and epoxy coating. But it was still remained erosion-corrosion damage such as impingement erosion, cavitation erosion, deposit attack. There was needs to develope the new coating materials to protective those corrosion damages. This paper, polyester glass flake, vinylester glass flake lining and epoxy coating for SS were investigated electrochemical tests and cavitation erosion test for corrosion behaviour under sea water. The main results obtained are as follows, 1) Surface of epoxy coating appear erosion pin hole but surface of polyester glass flake and vinylester glass flake lining do not appear erosion pin hole after impingement-cavitation erosion test in sea water. 2) Weight loss of polyester glass flake and vinylester glass flake lining do not occur after impingement-cavitation erosion test in sea water. 3) Corrosion current density of polyester glass flake lining less drained than epoxy coating and substrate under corrosion potential.. 4) Corrosion current density of vinylester glass flake lining with three coating less drained than that of polyester glass flake lining with two coating.

• 접착 및 계면
• /
• 제19권3호
• /
• pp.118-122
• /
• 2018

본 연구에서는 에스터기를 함유하는 직물 접착용 폴리우레탄 핫멜트 접착제를 합성하였다. 분자량 증가를 위하여 서로 다른 3종의 사슬 연장제를 사용하였고, 사슬연장제의 종류에 따른 분자량 변화와 접착물성 변화를 비교하였다. 사슬연장제로써1,4-부탄디올을 사용한 경우 다른 사슬연장제를 사용했을 때 보다 더 높은 박리강도를 나타내었으며, 높은 박리강도를 발휘하는 최적의 분자량이 존재함을 알게 되었다. 또한, 핫멜트 접착제를 다양한 직물 즉, 면, 폴리에스터 그리고 우레탄이 코팅된 폴리에스터에 대하여 접착시킨 후 접착력 측정과 $60^{\circ}C$ 물에 대한 내수성 실험을 수행한 결과 면직물에 대한 박리강도가 가장 큼을 보였고 우레탄 코팅된 폴리에스터 직물에 대해 가장 큰 내수성을 보였다.