• Title/Summary/Keyword: 에틸렌글리콜

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Dimensional Stability of Poly(ethylene/propylene naphthalate) as a Flexible Substrate Application (유연 기판 소재로 응용을 위한 폴리(에틸렌/프로필렌 나프탈레이트)의 치수안정성 연구)

  • Kim, Jae-Hyun;Heo, Hye-Young;Jung, Tae-Houng;Han, Joon-Hee;Kang, Ho-Jong
    • Polymer(Korea)
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    • v.33 no.4
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    • pp.371-376
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    • 2009
  • The 1,3-propane diol has been introduced as a co-monomer with ethylene glycol to polymerize the poly(ethylene/propylene naphthalate) in order to improve the dimensional stability of poly(ethylene naphthalate) for a possible flexible substrate material. Based on $^1H$-NMR results, it was found that poly (ethylene/propylene naphthalate) has been synthesised successfully. Introducing 1,3-propane diol resulted in the amorphous state in polyester as well as lowering of glass transition and thermal degradation temperature. Coexisting relatively longer propylene segment compared with ethylene in synthesized polyester caused less orientation behavior and reducing thermal expansion coefficient. This is a promising result for poly (ethylene/propylene naphthalate) to apply a flexible substrate.

Preparation and Properties of Eu3+ Doped Y2O3 Nanoparticles with a Solvothermal Synthesis Using the Ethylene Glycol (에틸렌 글리콜을 이용하여 용매열 합성으로 Eu3+가 도핑된 Y2O3 나노 입자의 제조 및 특성)

  • 신수철;조태환
    • Journal of the Korean Ceramic Society
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    • v.40 no.7
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    • pp.709-714
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    • 2003
  • Eu doped $Y_2$ $O_3$ nanoparticles were prepared with the solvothermal synthesis using the ethyleneglycol solvent at 20$0^{\circ}C$ for 3-5 h and then annealed in air at 1000-140$0^{\circ}C$ for 2-4 h. The X-ray diffraction pattern of annealed crystals at 100$0^{\circ}C$ for 2 h could be indexed as pure cubic cell of $Y_2$ $O_3$ phase with lattice parameters a=10.5856 $\AA$ which is very close to the reported data (JCPDS Card File, 41-1105 a=10.6041 $\AA$). Average size of prepared phosphor particles have about 100 nm, which were spherical morphology. The phosphor particle sizes decreased and the emission intensity increased at the annealing temperature. Though PL spectrum analysis, the 3% Eu doped $Y_{2-x}$ $O_3$:E $u_{x}$ $^{3+}$(x=0.06) phosphor showed the excitation spectrum at 250 nm wavelength and the maximum emission spectrum at 611 nm wavelength.

Effects of the Additives on Etching Characteristics of Aluminum Foil (첨가제에 의한 알루미늄박의 에칭특성변화)

  • Kim, Seong-Gap;Shin, Dong-Cheol;Jang, Jae-Myeong;Lee, Jong-Ho;Oh, Han-Jun;Chi, Chung-Su
    • Korean Journal of Materials Research
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    • v.11 no.1
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    • pp.48-54
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    • 2001
  • The effects of additives in the HCI etching solution on etching behaviors of aluminum foil as dielectric film for electrolytic capacitors were investigated. The etch pits formed in 1M hydrochloric acid containing ethylene glycol as an additive contain more fine and homogeneous etch tunnels compared to those in 1 M hydrochloric acid only, which led to the increase in the effective internal surface area of aluminum foil. After anodizing of aluminum foil etched in etching solutions, the LCR meter results have shown that the capacitance of dielectric film etched in hydrochloric acid with ethylene glycol was increased remarkably compared to that etched in hydrochloric acid only.

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Synthesis of Bishydroxyethyl Ether of Bisphenol A(BHE-BPA) Through the Depolymerization of Polycarbonate (폴리카보네이트 해중합을 이용한 Bisphenol A계 Bishydroxyethyl Ether 화합물 생성 특성)

  • Heo, Miseon;Kim, Beomsik;Park, Youin;Han, Myungwan
    • Korean Chemical Engineering Research
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    • v.48 no.2
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    • pp.164-171
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    • 2010
  • Recently, the waste of Polycarbonate(PC) is increase with the increase in demand of a polycarbonate. It is concerned with producing a new material and diol monomer, bishydroxyethyl ether of bisphenol A(BHE-BPA) through depolymerization of the polycarbonate waste at recycling. BHE-BPA can be used as a good raw material for the synthesis of polycarbonate type polyurethane. PC particles were depolymerized with base-catalyst NaOH, solvent EG, and ethylene carbonate(EC) was formed during the PC depolymerziation. EC was added to promote the conversion from bispenol-A to BHE-BPA. The characteristics of depolymeraion of polycarbonate as well as conversion of bispenol-A to BHE-BPA were investigated. BHE-BPA yield of 92% was obtained at temperature $220^{\circ}C$, 10% catalyst/PC mole ratio, 20 mmol of EC. BHE-BPA purity of better than 99% was achieved by crystallization of BHE-BPA.

Synthesis of Methoxy Poly(ethylene glycol)-b-poly($\varepsilon$-caprolactone) Diblock Copolymers and Release Behavior of Albumin for Implantable Protein Carriers (이식형 단백질 전달체로서 메톡시 폴리(에틸렌 글리콜)/폴리카프로락톤 블록 공중합체의 합성 및 알부민의 방출 거동)

  • 서광수;전세강;김문석;조선행;이해방;강길선
    • Polymer(Korea)
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    • v.28 no.3
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    • pp.232-238
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    • 2004
  • MPEG-PCL diblock copolymers consisting of methoxy poly(ethylene glycol) (MPEG) and $\varepsilon$-caprolactone (CL) as drug carriers were synthesized by ring-opening polymerization MPEG-PCL diblock copolymers were characterized by X-ray diffraction and differential scanning calorimetry. After freeze milling of block copolymers and albumin bovine-fluorescein isothiocyanate (FITC-BSA) as model protein, the wafers loaded FITC-BSA were fabricated by direct compression method. The release profiles of FITC-BSA were examined using pH 7.4 PBS for 14 days at 37$^{\circ}C$. The release amount was determined by fluorescence intensity by using the fluorescence spectrophotometer. The morphological change of wafers was observed by digital camera and scanning electron microscope. The release rate and initial burst of BSA increased with increasing PEG molecular weights and decreasing PCL molecular weights in the segments of MPEG -PCL diblock copolymers.

Effect of additives of non aqueous solution on the elelctrolytic polishing behaviors of austenitc stainless steel 316 (비수용성용액을 이용한 SUS316 전해연마시 첨가제 영향 고찰)

  • Kim, Seong-Wan;Kim, Gyeong-Tae;Lee, Jong-Seok;Kim, Hak-Seong
    • Proceedings of the Korean Institute of Surface Engineering Conference
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    • 2012.05a
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    • pp.303-304
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    • 2012
  • 공업적으로 널리 사용되는 내식강의 전해연마는 주로 고농도의 인산염 전해액 기반에 황산과 질산 첨가된 용액에서 $70^{\circ}C$ 이상의 고온에서 행해지다 보니 폐액 처리와 작업 환경이 좋지 않아 기피 기술로 인식 되어 있다. 본 연구에서는 환경 친화적인 상온 공정을 개발 하고자 에틸렌 글리콜 용액에 여러 가지 첨가제를 첨가하여 그 효과를 살펴보고 최적 조성과 공정 조건을 확립 하고자 하였다. 틸렌 글리콜에 물과 질산 암모니움을 첨가하여 점도와 pH, 전류 전압 특성을 구하고 여기에 첨가제인 설파메이트와 암모니움 클로라이드 첨가량을 정하고 각각의 효과를 확인 하였다. 이러한 결과를 바탕으로 SUS 316 재질에 대한 최적 연마조건을 설정하기 위해 조도 변화, 광택도 및 표면 조직 변화와 전해연마기구를 비교 검토하였다.

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Purification of p-Dioxanone from p-Dioxanone and Diethylene Glycol Mixture by a Layer Melt Crystallization (경막형 용융결정화에 의한 파라디옥사논과 디에틸렌글리콜 혼합물로부터 파라디옥사논의 정제)

  • Kim, Sung-Il;Kim, Chul-Ung;Park, So-Jin
    • Korean Chemical Engineering Research
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    • v.43 no.5
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    • pp.595-602
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    • 2005
  • In order to purify diethylene glycol as main impurity included in p-dioxanone, SLE (solid-liquid equilibria) and mixture density on two components system of p-dioxanone and diethylene glycol were measured and a layered melt crystallization with seed has been applied. The SLE of p-dioxanone and diethylene glycol were a simple eutectic system and the temperature and PDX concentration at eutectic point were 0.08 and 246 K, respectively. Densities of their binary mixtures were well fitted by the best correlation equation, ${\rho}_l=0.405+1.361x+0.002T-0.004xT$. In the melt crystallization, the growth rate (G) was proportional to the 1.5th power of the subcooling degree. The effective distribution coefficient ($K_{eff}$) as the degree of impurity removal was observed to increase with increasing the growth rate and initial p-dioxanone concentration. And also, $K_{eff}$ was correlated with Z function using Wintermantel's model such as $K_{eef}=-0.0604+6.392{\times}Z$. Finally, PDX purity through the optimization of this process can be obtained over 99%.

Electro-conductive polymer by $\gamma$-ray irradiation ($\gamma$-선 조사방식에 의한 전도성 폴리머 제작 특성)

  • ;;;G.A. Mun;V.A. Kovtunets;Z.S. Nurkeeva;V.V. Khutoryanskiy
    • Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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    • 2003.05a
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    • pp.762-765
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    • 2003
  • 에틸렌글리콜(ethyleneglycol)을 이용한 폴리비닐에테르(polyvinyl ether)와 같은 고분자물질을 활용하여 Co$^{30}$ 방사선원으로부터 ${\gamma}$선을 조사시켜, 고분자 물질의 성질을 변화시킴으로써 화학, 전기전자, 환경 및 기타 여러 가지 응용분야에 적용하여 이용할 수 있는 기술을 개발하였다. 이를 바탕으로 관련재료의 단량체(monomer)로부터 중합체(polymer)를 합성하여 water swelling을 시키는 과정에서 각종 (금속) 이온을 흡입-제거하는 방법의 환경복원기술, 흡입 금속이온을 표면에 밀집시켜 금속막을 형성하는 응용기술, 생체조직의 대용물질로 활용하는 의용공학 및 열감지특성(thermal sensitive property) 또는 pH 감지특성(pH sensitive property)을 이용하여 의용기술에 적용하는 polymer 응용기술 등의 폭넓은 활용을 위하여 그 일환으로 전도성 고분자 제조기술로의 활용가능성을 연구하였다.

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Synthesis of Two-Component Titanate Powders Using Ethylene Glycol Solution (에틸렌글리콜 용액을 이용한 2성분계 Titanate 분말의 합성)

  • 이상진;권명도
    • Journal of Powder Materials
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    • v.9 no.5
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    • pp.346-351
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    • 2002
  • Pure and fine, two-component titanate powders (barium titanate, calcium titanate etc.) were synthesized by an ethylene glycol method. Titanium isopropoxide and other metal ionic salts were dissolved in liquid-type ethylene glycol without any precipitation. In non-aqueous system, the amount of ethylene glycol affected the solubility and homogeneity of metal cation sources in the solution. At the optimum amount of the polymer, the metal ions were dispersed effectively in solution and a homogeneous polymeric network was formed. Most of the synthesized powders had sub-micron or nano-size primary particles after calcination and the agglomerated calcined powders were easily ground by ball milling process. All synthesized titanate powders had stable crystallization behavior at low temperature and high specific surface area after ball milling. The crystallization behavior and the microstructures of the calcined powders were affected on the ethylene glycol content.

The Effect of Nitrate Catalysts in Transesterification Reaction between Dimethyl Phthalate and Ethylene Glycol (디메틸프탈레이트와 에틸렌글리콜의 에스테르 교환반응에서 질산염 촉매의 영향)

  • Park, Keun-Ho;Sohn, Byoung-Chung
    • Journal of the Korean Applied Science and Technology
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    • v.10 no.1
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    • pp.23-29
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    • 1993
  • Transesterification reaction between dimethyl phthalate and ethylene glycol was kinetically investigated in the presense of various metal nitrate catalysts at $170^{\circ}C$. The reaction rates measured by the amount of distilled methanol from the reaction vessel. The transesterification reaction was carried out under the first order conditions respect to the concentration of dimethyl phthalate and catalyst, respectively. The over all order was 2nd. By Arrhenius plot, the activation energy was calculated as 17.4kcal/mole and 17.2kcal/mole on the transesterification reaction with zinc nitrate and lead nitrate, respectively. Apparent rate constant, k' was appeared linear about concentration of catalyst.