• 한국재료학회지
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• 제28권4호
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• pp.227-234
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• 2018

We investigate the effect of the modification of cellulose acetate propionate as an organic vehicle for silver paste on solar cell efficiency. For the modification of cellulose acetate propionate, poly(ethylene glycol) is introduced to the hydroxyl groups of a cellulose acetate propionate backbone via esterification reaction. The chemical structure and composition of poly(ethylene glycol) functionalized cellulose acetate propionate is characterized by Attenuated total reflectance Fourier transform infrared, $^1H$ nuclear magnetic resonance, differential scanning calorimetry and thermogravimetric analysis. Due to the effect of structural change for poly(ethylene glycol) functionalized cellulose acetate propionate on the viscosity of silver paste, the solar cell efficiency increases from 18.524 % to 18.652 %. In addition, when ethylene carbonate, which has a structure similar to poly(ethylene glycol), is introduced to cellulose acetate propionate via ring opening polymerization, we find that the efficiency of the solar cell increases from 18.524 % to 18.622 %.

• 한국정밀공학회:학술대회논문집
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• 한국정밀공학회 2012년도 춘계학술대회 논문집
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• pp.1197-1198
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• 2012

• 한국섬유공학회:학술대회논문집
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• 한국섬유공학회 2003년도 The Korea-Japan Joint Symposium
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• pp.94-94
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• 2003

Cross-linked polystyrene (PS) particles with carboxyl and/or poly(ethylene glycol) units on surface were formed by an emulsifier-free emulsion polymerization using styrene, methacrylic acid (MA), and poly(ethylene glycol) dimethacrylate (PEG-diMMA) at pH 7, and followed by freeze-drying to give the corresponding powders. Monodisperse polymer particles could be obtained at a concentration of PEG-diMMA 1 mol% relative to styrene. Zeta potential of polymer surface was measured to be 91 mV at a polymer of PEG-diMMA 1 mol% and was dropped as the content of MA increased.

• Bulletin of the Korean Chemical Society
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• 제23권5호
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• pp.683-687
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• 2002

We have investigated the effect of the number of ethylene oxide (EO) units inside poly(ethylene glycol)dimethacrylate (PEGDMA) on the ionic conductivity of its gelled polymer electrolyte, whose content ranges from 50 to 80 wt%. PEGDMA gelled polym er electrolytes, a crosslinked structure, were prepared using simple photo-induced radical polymerization by ultraviolet light. The effect of the number of EO on the ionic conductivity was clearly shown in samples of lower liquid electrolyte content. We have concluded that the ionic conductivity increased in proportion to both the number of EO units and the plasticizer content. We have also studied the electrochemical properties of 13PEGDMA (number of EO units is 13) gelled polymer electrolyte.

• 한국결정성장학회지
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• 제8권2호
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• pp.350-355
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• 1998

Ethylene glycol을 polymeric carrier로 사용한 새로운 화학적 세라믹 분말 제조 공정에 의하여 $(Dy_2TiO_5)$ 분말을 제조하였다. Chelation 공정의 생략에도 불구하고, 고순도의 미세한 입자를 갖는 세라믹 분말 제조가 가능함을 확인하였다. 열분석, 미세구조분석, 회절분석 등으로 분말특성을 평가하였다.

• 한국표면공학회:학술대회논문집
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• 한국표면공학회 2014년도 추계학술대회 논문집
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• pp.286-288
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• 2014

This study deals with the catalyst free radio frequency plasma assisted polymerization of ethylene glycol using nitrogen as reactive gas to modify the surface chemistry and morphology. The deposited film was characterized through various analysis techniques i.e. surface profilometry, Forier transform infrared spectroscopy, water contact angle and UV-visible spectroscopy to analyze film thickness, chemical structure, surface energy and optical properties respectively. The surface topography was analyzed by Atomic force microscopy. It was observed that the ethylene oxide behaviour and optical transmittance of the film were reduced with the introduction of nitrogen gas due to higher fragmentation of monomer. However the hydrophilic behavior of the film improved due to formation of new water loving functional groups suitable for biomedical applications.

• 한국추진공학회:학술대회논문집
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• 한국추진공학회 2006년도 제26회 춘계학술대회논문집
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• pp.229-232
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• 2006

Tetrahydrofuran(THF)과 Ethylene oxide(EO) 또는 EO를 단량체로 하여 양이온 개환중합을 이용한 새로운 합성방법으로 random 또는 tri-block HTPE(Hydroxyl-terminated polyether)를 합성할 수 있었다. 합성된 random과 tri-block HTPE를 IPDI/N-100혼합 디이소시아네이트 경화제와 촉매로 TPB(triphenylbismuth)를 사용하여 폴리우레탄을 제조하였으며, 혼합 이소시아네이트 화합물의 비율에 따른 폴리우레탄의 기계적 특성을 연구하였다. 그리고 폴리 우레탄 추진제 바인더 제조를 위한 prepolymer인 합성된 HTPE의 최적 경화 조건을 찾기 위해 HTPE의 후처리 과정, 우레탄 합성시 사용되는 촉매의 양 등의 영향에 대해 알아보았다.

• 한국고분자학회:학술대회논문집
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• 한국고분자학회 2006년도 IUPAC International Symposium on Advanced Polymers for Emerging Technologies
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• pp.156-157
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• 2006

Quasi-living polymerization conditions for the copolymerization of ethylene and functionalized norbornenes can be achieved by using an initiator system comprising $[N-(2,6-diisopropylphenyl)-2-(2,6-diisopropylphenylimino)-propanamidato-{\kappa}^2N,O]Ni({\Box}^1-CH_2Ph)(PMe_3)\;and\;Ni(COD)_2$. It is possible with this polymerization system to obtain block-copolymer and tapered structures. The latter form microdomains similar to those of standard block co-polymers. The mechanism of the reaction will also be discussed.

• Macromolecular Research
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• 제13권1호
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• pp.39-44
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• 2005

Ion-exchange polymeric stationary phases presenting amino acid and amino groups were prepared by the surface grafting of glycidyl methacrylate onto a silica gel surface and subsequent amination. Three kinds of amino acids-L-arginine (Arg), D-lysine (Lys), and D-histine (His)-were used in this study. An ion-exchange polymeric stationary phase presenting ethylene diamine (EDA) was also prepared by surface graft polymerization. Separation of the model proteins bovine serum albumin (BSA), chick egg albumin (CEA), and hemoglobin (Hb) was performed using the amino acid- and amine-derived columns. In separating the CEA/BSA mixture, the resolution time of BSA was longer than that of CEA when using the EDA column, whereas the resolution time of BSA was shorter than that of CEA when using the Arg, Lys, and His columns. In the separation of the Hb/BSA mixture, the resolution time of BSA was longer than that of Hb in the EDA column, whereas the resolution time of BSA was shorter than that of Hb in the amino acid columns (D-Lys, L-Arg, and D-His).

• 공업화학
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• 제10권4호
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• pp.523-530
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• 1999

아클릴계 점착제는 주로 용제를 사용하여 제조되어 왔으나 용제의 사용에 따른 화재의 위험성과 환경적인 부작용으로 인해 점차 법률적으로 규제의 대상이 되고 있음에 따라 용제를 사용하지 않는 수계 에멀젼 중합을 이용한 제조 방법이 중요하게 대두되고 있다. 따라서 본 연구에서는 $40^{\circ}C$의 반응기에 methacrylic acid(MAA), n-butyl acrylate(n-BA), 그리고 2-ethylhexyl acrylate(2-EHA) 등 3가지 종류의 단량체를 사용하여 유화 중합을 수행하였으며, 실험에 사용된 계면활성제는 음이온 계면활성제로 sodium dodecyl sulfate(SDS), 비이온 계면활성제로 ethylene oxide 계통을 사용하였다. 실험 결과 혼합 계면활성제 시스템에서의 전환율이 단일 계면활성제 시스템에서의 전환율보다 더 높게 나왔으며, 비이온 계면활성제만을 사용한 유화중합은 안정성이 떨어져 상 분리가 일어났다. 반면에 음이온 계면활성제 또는 혼합 계면활성제를 사용한 유화 중합 시스템은 매우 안정한 상태를 유지하여 12주 이상의 저장 안정성을 보였다. 혼합 계면활성제 시스템에서 에멀젼 입자는 비이온 계면활성제 시스템 비해 작은 크기를 가지며, 계면활성제의 양이 증가할수록 입자 크기는 감소하였다. 계면활성제의 형태와 사용량, 그리고 혼합 비율 등은 에멀젼 입자의 Tg와 분자량에 거의 영향을 미치지 않았다. 실험 결과를 종합하여 보면, 50개의 침수성기를 가지고 소수성 chain의 탄소수가 16~18인 비인온 계면활성제를 40~60% 정도 사용한 약 4 g 정도의 혼합 계면활성제 시스템이 에멀젼의 안정성과 접착력에서 가장 최적의 제조 조건임을 알 수 있었다.