• 한국염색가공학회지
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• 제6권4호
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• pp.17-26
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• 1994

Poly(ethylene terephthalate)(PET) filaments were treated in binary mixtures of organic solvents such as benzyl alcohol/perchloroethylene(BA/PER), benzyl alcohol/trichloroethylene(BA/TRI), benzyl alcohol/ethylene chloride(BA/EC), methanol/perchloroethylene (ME/PER), and methanol/trichloroethylene(ME/TRI). From the equilibrium swelling of PET, total and partial isotherms of PET for sorption of solvent mixtures and isotherms for distribution of the components between the phases were taken. Also the shrinkage and the crystallinity of PET treated with binary mixtures were investigated. The results obtained were summerized as follows: 1. All isotherms for distribution of the components between the phase deviated from the diagonal in system of PET-binary mixtures. Especially in the binary mixtures of ME/PER or ME/TRI, selectivo sorption of chlorinated hydrocarbon PER and TRI by PET occured. 2. The shrinkage of PET treated in binary mixrures was increased to compare with single solvent-treated, but the composition of binary mixtures corresponding to maximum values of shrinkage was not always agreed with the composition of binary mixtures corresponding to maximum values of shrinkage was not always agreed with the composition of binary mixtures exhibiting of the maximum swelling of PET. 3. The crystallinity of PET treated in binary mixtures generally increased than that of single solvent-treated.

• 한국신재생에너지학회:학술대회논문집
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• 한국신재생에너지학회 2011년도 추계학술대회 초록집
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• pp.55.1-55.1
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• 2011

Dye-sensitized solar cell(DSSC) have been considered one of the promising alternatives to conventional solar cells, because of their low cost, easy fabrication and relatively high energy conversion efficiency. However, although the cell offers reasonable efficiency at least 11%, the use of a liquid electrolyte placed technological challenges for achieving the desired durability and operational stability of the cell. In order to prevent or reduce electrolyte leakage considerable efforts have been made, such as p-type semiconductor or organic hole-transport material that better mechanical properties and simple fabrication processes. In this work, we synthesized solid-state electrolyte containing LiI and KI metal salt with starting materials of poly ethylene oxide to substitute liquid electrolyte enhance the ionic conductivity and solar conversion efficiency. Li+ leads to faster diffusion and higher efficiency and K+ leading to higher ionic conductivity. The efficiency of poly ethylene oxide/LiI system electrolyte is 1.47% and poly ethylene oxide/potassium electrolyte is 1.21%. An efficiency of 3.24% is achieved using solid-state electrolyte containing LiI and KI concentrations. The increased solar conversion efficiency is attributed to decreased crystallinity in the polymer that leads to enhanced charge transfer.

• Korea-Australia Rheology Journal
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• 제13권2호
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• pp.83-87
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• 2001

The morphology and mechanical properties of the blends of a syndiotactic polystyrene (SPS) and poly-styrene-block-poly(ethylene-co-butylene)-block-polystyrene copolymers (SEBS) with various polystyrene block contents are studied. Mechanical properties, especially elongation at break and impact strength (IS), of the blend depend upon the morphology and interfacial adhesion, which in rum are affected by the viscosity ratio of constituent components and the styrene block content in SEBS. The IS of a blend was affected by the combined effect of rubber content and the interfacial adhesion. A maximum IS was found for a blend with the weight fraction of the PS block in an SEBS of 0.18. The IS of blends with smaller weight fractions of the PS block exhibited lower due to poor interfacial adhesion between SPS/SEBS in spite of a larger amount of rubber block. On the other hand, the IS of blends with larger weight fraction of the PS block becomes smaller due to lower amounts of rubber block in spite of better interfacial adhesion.

• Korean Chemical Engineering Research
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• 제56권1호
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• pp.103-111
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• 2018

본 연구에서는 PET (Poly Ethylene Terephthalate)의 단량체인 BHET (bis (2-Hydroxyethyl) Terephthalate)와 1,4-BD(1,4-Butanediol)의에스테르교환반응을활용하여 PBT (Poly Butylene Terephthalate)의단량체인 BHBT (Bis (4-Hydroxybutyl Terephthate)를 생성하는 반응에 대하여 조사하였다. 이 반응의 촉매로 Zinc Acetate를 사용하였다. 회분식 반응기를 통하여 BHET, EG (Ethylene Glycol), THF (Tetrahydrofuran)의 양을 정량하여 반응 kinetics 모델을 구성하였다. 제시된 모델을 통하여 반응속도와 반응물의 조성 분포를 조사하였고, 이 모델의 예측 값과 실험 값들이 잘 일치함을 보였다.

• Bulletin of the Korean Chemical Society
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• 제29권8호
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• pp.1539-1544
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• 2008

A polymeric micelle, based on the poly(benzyl-L-histidine)-b-poly(ethylene glycol) (polyBz-His-b-PEG) diblock copolymer, was designed as a tumor-specific targeting carrier. The micelles (particle size: 67-80 nm, critical micelle concentration (CMC); 2-3 $\mu$g/mL) were formed from the diafilteration method at pH 7.4, as a result of self-assembly of the polyBz-His block at the core and PEG block on the shell. Removing benzyl (Bz) group from polyBz-His block provided pH-sensitivity of the micellar core; the micelles were physically destabilized in the pH range of pH 7.4-5.5, depending on the content of the His group free from Bz group. The ionization of His group at a slightly acidic pH promoted the deformation of the interior core. These pHdependent physical changes of the micelles provide the mechanism for pH-triggering anticancer drug (e.g., doxorubicin: DOX) release from the micelle in response to the tumor’s extracellular pH range (pH 7.2-6.5).

• 한국섬유공학회:학술대회논문집
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• 한국섬유공학회 1987년도 제2차학술발표초록집
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• pp.20-20
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• 1987

• 한국의류산업학회지
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• 제15권2호
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• pp.302-308
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• 2013

This study is a preliminary investigation of the influence of surface characteristics of substrates on detergency of particulate soil. The surface of PET film was modified with NaOH and NaOH+ethylene diamine on different times. The surface morphology of the film was scanned by AFM and surface energies were calculated from measured contact angles between several solutions and film based on the geometric mean and a Lewis acid base method. The surface morphology of PET film treated with NaOH and NaOH+ethylene diamine became more etched, and the surface area, surface roughness and the coefficient of friction of film increased with treatment of NaOH and NaOH+ethylene diamine. The contact angle of film treated with NaOH and NaOH+ethylene diamine decreased in water and surfactant solution; in addition, the surface energy increased was largely attributed to the increased portion on the polar surface energy of film. However, the effect of the diamine addition to the NaOH treatment solution on surface characteristics of PET film was insignificant.

• 접착 및 계면
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• 제4권3호
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• pp.14-20
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• 2003

UV 경화에 사용되는 poly(ethylene glycol 400) dimethacrylate(PEGA400DMA)와 ethylene glycol dimethacrylate(EGDMA)를 사용하여 모노머(monomer)의 종류에 따른 경화거동과 광개시제의 양과 온도에 따른 경화 거동을 photo-DSC를 사용하여 살펴보았다. Ethylene glycol의 단위길이가 늘어날수록, 광개시제의 양이 증가할수록, 반응 온도가 높을수록 경화속도가 빠르게 일어났다. 또한 PEG400DMA의 반응속도가 EGDMA보다 느리게 나타났지만 전환률은 높게 나타남을 알 수 있었다.

• 멤브레인
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• 제14권3호
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• pp.250-257
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• 2004

이산화탄소 분리에 이용하기 위하여 PEG (Poly(ethylene glycol)diacrylate)와 PPG (Poly(propylene glycol) diacrylate)를 광학 중합반응(Photopoly merization)을 이용하여 제조하였다. PEG와 PPG는 분자량이 각각 258과 540이었다. PEG와 PPG의 질량 혼합비(wt%)를 9:1, 8:2, 7:3, 6:4, 5:5로 변화시키면서 막을 제조하였다. $25^{\circ}C$에서 PEG/PPG (9:1)의 이산화탄소 투과도는 28.9 barrel 으로 나타났으며, 선택도($PCO_2$/$PN_2$)는 57.9로 나타났다. 같은 온도에서 PEG/PPG(5:5)로 조성을 변화시켰을 때 이산화탄소 투과도는 40.4 Barrer, 기체선택도($PCO_2$/$PN_2$)는 51.8를 나타냈다 이산화탄소의 투과도는 5:5 > 6:4 > 7:3 > 8:2 > 9:1의 경향을 나타내었다. $35^{\circ}C$로 승온을 하는 경우에 PEG/PPG (9:1)는 45.4 Baller, 선택도($PCO_2$/$PN_2$)는 48.2을 나타냈으며, PEG/PPG (5:5)의 이산화탄소 투과도는 78.9 Barrer을 나타내고 선택도($PCO_2$/$PN_2$)는 33.2로 나타났다. 각각의 온도에서 이산화탄소의 기체선택도($PCO_2$/$PN_2$)는 PPG의 함량이 증가하면서 감소하는 경향을 나타내었다.

• 한국섬유공학회:학술대회논문집
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• 한국섬유공학회 2003년도 봄 학술발표회 논문집
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• pp.343-344
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• 2003

폴리에틸렌 나프탈레이트(PEN)는 열적 및 물리적 특성이 우수한 고분자로서 포장재료, 필름, tire cord 등으로 그 이용범위가 확대되고 있는 고분자이다[l]. 그러나 강직한 분자사슬을 가지고 있는 PEN은 고결정성과 소수성 둥으로 인해 흡습성, 제전성 및 염색성이 좋지 못하고 성형가공이 어려운 단점도 있다. 이미 동종계열인 PET의 경우 그러한 단점을 개선하고자 합성반응시 diol과 같은 제 3의 단량체를 사용하여 공축합하는 연구[2-3]가 시도된바 있으나 PEN의 경우 아직 이에 관한 연구보고가 없는 실정이다. (중략)