• 한국진공학회:학술대회논문집
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• 한국진공학회 2000년도 제18회 학술발표회 논문개요집
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• pp.60-60
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• 2000

The adhesion interface formation between copper and poly(ethylene terephthalate)(PET), poly(methyl methacrylate)(PMMA) and Polyimide films was treated using Ion assisted reaction system to sequential sputter deposition by High-Frequency ion source. The ion beam modification system used a new type of low power HF ion thruster for space application as new low thruster electric propulsion system. Low power HF ion thruster with diameter 100mm gives the opportunity to obtain beams of Ar+ with currents 20~150 mA (current density 0.5~3.5 mA/cm2) and energy 200~2500eV at HF power level 10~150 W. Using Ar as a working gas it is possible to obtain thrust within 3~8 mN. Contact angles for untreated films were over 95$^{\circ}$ and 80 for Pet, 10o for PMMA and 12o for PI samples as a condition of ion assisted reaction at the ion dose of 10$\times$1016 ions/cm2, the ion beam potential of 1.2 keV and 4 ml/min for environmental gas flow rate. 900o peel tests yielded values of 15 to 35 for PET, 18 to 40 and 12 to 36 g/min. respectively. High resolution X-ray photoelectron spectrocopy is the Cls region for Cu metal on these polymer substrates showed increases in C=O-O groups for polymide, whereas PET and PMMA treated samples showed only C=O groups with increase the ion dose. Finally, unstable polymer surface can be changed from hydrophobic to hydrophilic formation such as C-O and C=O that were confirmed by the XPS analysis, conclusionally, the ion assisted reaction is very effective tools to attach reactive ion species to form functional groups on C-C bond chains of PET, PMMA and PI.

• 공업화학
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• 제27권1호
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• pp.68-73
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• 2016

1-decanoic acid와 tri-n-octylphosphine을 분산 안정제로서 사용하고, $NaBH_4$를 환원제로 사용하여 화학적 환원법으로 $AgNO_3$ 수용액으로부터 페이스트용 은 나노입자를 제조하였다. 은 나노입자의 생성, 은 나노입자의 형상 및 크기를 XRD, UV-vis, TEM 및 SEM으로 조사하였다. 합성된 은 나노입자로 페이스트를 제조하여 점도를 측정하였으며, PET 막에 코팅하여 제조된 은 박막의 표면저항을 조사하였다. $NaBH_4/AgNO_3$의 몰비는 1 : 5가 최적으로 나타났고, 최적의 몰비에서 10-200 nm의 잘 분산된 구형에 가까운 은 나노입자를 얻을 수 있었다. 최적의 조건에서 얻은 은 나노입자로 PET 막에 코팅하여 제조한 은 박막의 표면저항은 $41{\mu}{\Omega}/cm^2$의 낮은 값을 나타내었다.

• 한국식품저장유통학회지
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• 제19권1호
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• pp.1-6
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• 2012

유통현장에서 다양한 포장형태로 이용되는 어린잎 채소의 포장 방법별 선도유지 효과를 구명하고자 하였다. 현장에서 이용되는 대표적인 소포장 형태별로 다채를 $16^{\circ}C$에 저장하면서 중량변화, 수분 함유량, 가스조성, 외관품위 등을 측정하였다. 포장형태에 따른 중량변화는 밀폐 정도가 큰 PET 용기 포장(밀폐형)과 OPP 무공필름 포장에서 적었으며, 외관의 변화 정도도 적어 비교적 높은 상품성을 유지한 것으로 나타났다. 그러나 무공의 OPP 필름으로 저장한 경우 색상변화 정도가 커서, 포장 시 이에 대한 고려도 필요할 것으로 생각된다. 본 실험의 결과, 밀폐 정도가 크고, PET와 같은 경질 필름 형태로 저장하는 것이 상품성 유지에 효과적인 것으로 나타났으며, 포장 형태의 천공 정도가 큰 것은 상품성을 저하시키는 것으로 나타났다. 어린잎 채소의 포장 방법에 대한 연구는 많이 있으나 유통현장에서 활용이 많이 미흡한 실정으로 본 실험 결과를 통해 어린잎 채소를 효과적으로 상품성을 보존할 수 있는 방법 검토시 도움이 되리라 생각된다.

• 한국진공학회:학술대회논문집
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• 한국진공학회 2015년도 제49회 하계 정기학술대회 초록집
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• pp.179.1-179.1
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• 2015

Thickness-dependent electrical, structural, and optical properties of zinc oxide (ZnO) thin films on polyethylene terephthalate (PET) substrates were investigated in the very thin thickness range of 20 to 120 nm. A very unusual transition phenomenon, in which electrical resistance increases with an increase in film thickness, was observed. From structural and compositional analyses, this transition behavior was explained to arise from metallic Zn agglomerates dispersed in non-crystalline Zn-O matrix. It was unveiled that film thickness more than 80 nm is required for the development of hexagonal crystal structure of ZnO. ZnO films on PET substrates exhibited high optical transmittance and good mechanical flexibility in the thickness range. The results of this study would provide a valuable guideline for the design of ZnO thin films on organic substrates for practical applications.

• 전기학회논문지
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• 제59권12호
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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.

• 한국레이저가공학회:학술대회논문집
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• 한국레이저가공학회 2006년도 춘계학술발표대회 논문집
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• pp.60-65
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• 2006

Previous studies demonstrated that laser ablation under transparent liquid can result in ablation enhacement and particle removal from the surface. In this work, the liquid-assisted excimer laser ablation process is examined fer polyethylene terephthalate (PET), polymethyl methacrylate (PMMA), Si, and alumina with emphasis on ablation enhacement, surface topography, and debris formation. In the case of PET and PMMA, the effect of liquid is analyzed both fer thin water film and bulk water. As the ablation enhanement by liquid is already known for Si and alumina, the analysis focuses on surface topography and debris formation resulting from the liquid-assisted laser ablation process. The results show that application of liquid increases the ablation rate of PMMA while that of PET remains unchanged even in the liquid-assisted process. It is also revealed that the liquid can significantly improve the surface quality by reducing the debris deposition. However, the surface roughness is generally deteriorated in the liquid-assisted process. The surface toporaphy is found to be strongly dependent on the method of liquid application, i.e., thin film or bulk liquid.

• 한국섬유공학회:학술대회논문집
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• 한국섬유공학회 2003년도 가을 학술발표회 논문집
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• pp.199-200
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• 2003

PEN (Polyethylene 2,6-dicarboxyl naphthalate)은 PET와 화학적 구조가 유사한 polyester 이다. PEN은 PET 의 benzene ring 대신 naphthalene ring이 있는 구조로서 rigid 한 구조를 바탕으로 PET 보다 훨씬 우수한 기계적 물성과 기체 차단성 및 전기 절연성을 가지고 있기 때문에, 현재 PEN에 대해서는 많은 연구가 진행되었고, 상업용으로도 생산되고 있다. 현재까지 진행된 PEN에 대한 연구 중 X-ray를 이용한 배향 거동에 대한 연구보고는 많았으나, 아직까지 FTIR-ATR 을 통해서 시료의 Machine Direction (MD), Transverse Direction (TD), Normal Direction (ND)의 세 방향으로 필름의 3차원적 분자 배향의 거동에 대한 연구보고는 없다. (중략)

• 한국안전학회지
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• 제16권3호
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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.

• Nuclear Engineering and Technology
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• 제54권7호
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• pp.2592-2598
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• 2022

Research groups in the field of PET instrumentation are studying time-of-flight(TOF) technology to improve the signal-to-noise ratio of PET images. Scintillation light transport and collection plays an important role in improving the coincidence resolving time(CRT) of PET detector based on a pixelated crystal array. Four crystal arrays were designed by the different optical reflection configuration such as external reflectors and surface treatment on the CRT and compared with the light output, energy resolution and CRT. The design proposed in the study was composed of 8 × 8 LYSO crystal array consisted of 3 × 3 × 15 mm³ pixels. The entrance side was roughened while the other five surfaces were polished. Four sides of all crystal pixels were wrapped with ESR-film, and the entrance surface was covered by Teflon-tape. The design provided an excellent timing resolution of 210 ps and improved the CRT by 16% compared to the conventional method using a polishing treatment and ESR-film. This study provided a method for improving the light output and CRT of a pixelated scintillation crystal-based brain TOF PET detector. The proposed configuration might be an attractive detector design for TOF brain PET requiring fast timing performance with high cost-effectiveness.

• 월간포장계
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• 제8호통권184호
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• pp.66-69
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• 2008

원자재 가격상승과 유가 폭등으로 인해 국내 폴리에스터 업계는 중국 제품에 가격 경쟁력이 밀리는 범용 제품 비중을 줄이고 부가가치가 높은 광학 및 특수용도 제품 비중을 높여나가는 등의 노력에 주력하고 있다. 유가 인상과 단가 하락 압력, 경쟁 격화 등으로 포장재 등에 쓰이는 범용 PET 필름은 물론 확산필름 등 일반 LCD용 광학필름의 수익성이 낮아지면서 수익성이 좋은 분야의 비중을 확대하려는 움직임에 따라 올해 폴리에스터(PET) 필름 업계의 화두는 광학 및 태양전지에의 PET 필름의 적용 및 응용이었다. SKC가 먼저 광학필름의 원자재로 쓰이는 고순도 후막 베이스필름이나 태양전지나 하이브리드 자동차 부품용 필름 분야로 진출을 계획중이며 코오롱도 후막 필름 라인을 1기 증설하고 기존 포장재 라인도 전환키로 했다. 또한 도레이새한도 후막 필름을 주력제품으로 끌어올릴 계획을 갖고 있다. 본 고에서는 PET 필름 및 나일론 필름 수급동향을 살펴보고, 업체별 상황 및 전망을 살펴보도록 한다.