• 한국전기전자재료학회논문지
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• 제17권6호
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• pp.608-614
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• 2004

The gel polymer electrolyte was prepared by radical polymerization using tetra(ethylene glycol) diacrylate and tri(ethylene glycol) dimethacrylate to investigate affect of the number of ethylene oxide. The gel polymer electrolyte showed good electrochemical stability up to 4.5 V vs. Li/Li and high ionic conductivity at various temperatures. The lithium-ion polymer batteries with the gel polymer electrolyte, tetra(ethylene glycol) diacrylate- and tri(ethylene glycol) dimethacrylate-based, also represented good electrochemical performances such as rate capability, low-temperature performances and cycleability. However, the cell with tri(ethylene glycol) dimethacrylate, which has three ethylene oxide, showed better electrochemical performance.

• Macromolecular Research
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• 제9권5호
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• pp.292-295
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• 2001

A cross-linked solid polymer electrolyte was prepared by copolymerizing photochemically acrylonitrile (AN), oligo(ethylene glycol ethyl ether) methacrylate, oligo(ethylene glycol) dimethacrylate in the presence of lithium perchlorate as a lithium salt, ethylene carbonate-propylene carbonate as a mixed plasticizer, and poly(ethylene oxide) as a polymer matrix. The maximum ionic conductivity of the polymer electrolyte was 2.35$\times$10$\^$-3/ S/cm. The interface resistance of the polymer electrolyte was very low compared to that of the polymer electrolyte without AN. The former electrolyte was stable up to 4.3 V and the Ah efficiency was nearly 100% during the charge-discharge cycle.

• 전기화학회지
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• 제18권4호
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• pp.150-155
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• 2015

본 연구에서는 glycerol-1,2-carbonate와 4-chloromethyl styrene을 함유하는 공중합체를 합성하고, poly(ethylene glycol) methyl ether 와의 Williamson 반응을 이용하여 poly(ethylene glycol)이 가지로 도입됨과 동시에 높은 유전상수의 에틸렌 카보네이트를 함유하는 고분자전해질을 제조하였다. 흥미롭게도 전해질의 상온 이온전도도는 7 mol%의 에틸렌 카보네이트를 포함하는 가지형 고분자에서 $1.75{\times}10^{-5}S\;cm^{-1}$으로 가장 높게 얻어졌고, 이때 [EO]:[Li] 비율의 최적화는 32:1이었다. 또한 에틸렌 카보네이트기의 존재에 의해 고분자전해질의 전기화학적 안정성을 5.5 V까지 확보할 수 있었다.

• Macromolecular Research
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• 제12권5호
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• pp.431-436
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• 2004

Cross-linked network solid polymer electrolytes were prepared by means of in situ hydrosilylation between poly[hydromethylslioxane-g-oligo(ethylene oxide)] and diallyl or triallyl group-containing poly(ethylene glycols). The conductivities of the resulting polymer electrolytes were greatly enhanced upon the addition of poly(ethylene glycol) dimethyl ether (PEGDME) as an ion-conducting plasticizer. Conductivities of the cross-linked polymer electrolytes were more dependent on the molecular weight of PEGDME than on the cross-linkers. The maximum conductivity was found to be 5.6${\times}$10$\^$-4/ S/cm at 30$^{\circ}C$ for the sample containing 75 wt% of PEGDME (M$\_$n/ =400). These electrolytes exhibited electrochemical stability up to 4.5 V against the lithium reference electrode. We observed reversible electrochemical plating/stripping of lithium on the nickel electrode.

• Macromolecular Research
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• 제9권6호
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• pp.332-338
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• 2001

Waterborne polyurethane as a new polymer electrolyte was synthesized by using relatively hydrophilic polyols. The morphology of polyurethane was changed as it was dispersed in water. In contrast to polyurethane ionomer, waterborne polyurethane did not form an ionic cluster but produced a binary system composed of hydrophilic and hydrophobic groups. In the colloidal system, the former and the latter existed at outward and inward, respectively. Waterborne polyurethane was prepared from poly(ethylene glycol) (PEG) /poly(propylene glycol) (PPG) copolymer, 4,4'-diphenylmethane diisocyanate(MDI), ethylene diamine as a chain extender, and three ionization agents, 1,3-propane sultone, sodium hydride and lithium hydroxide. PEG/PPG copolymer was used for suppressing the crystallinity of PEG and N-H bond was ionized for increasing the electrochemical stability of polyurethane. Low molecular weight poly(ethylene glycol) and poly(ethylene glycol dimethyl ether) (PEGDME) were used as plasticizers. DSC, FT-IR and $^1$H-NMR of the waterborne polyurethane were measured. Also, the ionic conductivity of solid polymer electrolytes based on waterborne polyurethane and various concentrations of low molecular weight poly(ethylene glycol) or PEGDME were measured by AC impedance.

• 한국산학기술학회논문지
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• 제20권7호
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• pp.265-271
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• 2019

본 논문의 목적은 기존의 에틸렌기반 폴리머 사용 배합인 투수 콘크리트 단점을 개선하고자, 아크릴 폴리머를 적용함으로써 개선된 도로 포장 재료로써 활용하기 위한 기초자료를 제시하고 한다. 기존의 에틸렌 폴리머 기반 투수 콘크리트 재료를 선정하고, 아크릴 폴리머를 혼입하여 배합 설계하여 비교 평가하였다. 시험결과, 기존 에틸렌 기반 폴리머 투수 콘크리트 배합 경우 큰 공극률이 발생하여 압축강도 증진이 미약한 결과를 나타냈었고, 아크릴 폴리머 기반 투수 콘크리트 배합 경우 KS에서 규정하고 있는 차도용 28일 압축강도 24MPa을 만족하였다. 휨강도인 경우, 아크릴 폴리머 기반 투수 콘크리트 배합 강도가 우수하였으며, 투수 계수는 모든 변수에서 기준인 0.1(mm/s) 이상으로 측정되었다. 흡수율의 경우 모든 변수에서 1% 이하로 측정되었고, 동탄성계수 측정결과, 아크릴 폴리머배합특성의 경우 120 Cycle 이상 측정을 유지할 수 있었고, 다른 배합의 경우 80 Cycle 이상 유지하지 못하였다. 따라서 기존의 에틸렌 폴리머 기반보다 아크릴 폴리머를 적용함으로써, 내구성 향상에 효과적인 것으로 판단된다.

• Fibers and Polymers
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• 제7권2호
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• pp.89-94
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• 2006

Ionic conductivity and mechanical properties of a mixed polymer matrix consisting of poly(ethylene glycol) (PEG) and cyanoresin type M (CRM) with various lithium salts and plasticizer were examined. The CRM used was a copolymer of cyanoethyl pullulan and cyanoethyl poly(vinyl alcohol) with a molar ratio of 1:1, mixed plasticizer was ethylene carbonate (EC) and propylene carbonate (PC) at a volume ratio of 1:1. The conductive behavior of polymer electrolytes in the temperature range of $298{\sim}338\;K$ was investigated. The $PEG/LiClO_4$ complexes exhibited the highest ionic conductivity of ${\sim}10^{-5}S/cm$ at $25^{\circ}C$ with the salt concentration of 1.5 M. In addition, the plasticized $PEG/LiClO_4$ complexes exhibited improvement of ionic conductivity. However, their complexes showed decreased mechanical properties. The improvement of ionic conductivity and mechanical properties could be obtained from the polymer electrolytes by using CRM. The highest ionic conductivity of PEG/CRM/$LiClO_4$/(EC-PC) was $5.33{\time}10^{-4}S/cm$ at $25^{\circ}C$.

• 폴리머
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• 제25권6호
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• pp.848-854
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• 2001

무정형 고분자인 ethylene-methyl acrlate-glycidyl methacrylate 공중합체 (E-MeA-GMA)와 결정성 고분자인 poly(ethylene terephthalate) (PET)와의 블렌드에서 그라프트 반응에 따른 PET의 결정화 거동을 조사하였다. PET와 E-MeA-GMA간의 그라프트 반응 수준을 torque-rheometer, FT-IR, SEM을 이용하여 확인하였으며, 반응시간에 따른 결정화 거동 변화를 DSC와 광산란 방법을 이용하여 관찰하였다. 또한 라멜라 수준의 결정구조를 소각 X선 산란법을 이용하여 조사하였다.

• Macromolecular Research
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• 제11권1호
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• pp.62-68
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• 2003

Thermotropic liquid crystalline polymer (TLCP)/poly(ethylene 2,6-naphthalate) (PEN)/poly(ethylene terephthalate) (PET) ternary blends were prepared by melt blending, and were melt-spun to fibers at various spinning speeds in an effort to improve fiber performance and processability. Structure and property relationship of TLCP/PEN/PET ternary blend fibers and effects of annealing on those were investigated. The mechanical properties of ternary blend fibers could be significantly improved by annealing, which were attributed to the development of more ordered crystallites and the formation of more perfect crystalline structures. TLCP/PEN/PET ternary blend fibers that annealed at 18$0^{\circ}C$ for 2 h, exhibited the highest values of tensile strength and modulus. The double melting behaviors observed in the annealed ternary blend fibers depended on annealing temperature and time, which might be caused by different lamellae thickness distribution as a result of the melting-reorganization process during the DSC scans.

• 폴리머
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• 제33권2호
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• pp.137-143
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• 2009

이 연구에서 norfloxacin(NFX)이 담지된 poly($\varepsilon$-caprolactone)/poly(ethylene glycol)(PCL/PEG, abbreviated as CE) 이중블록공중합체로 구성된 고분자 미셀을 제조하였다. 입자크기는 PCL블록길이에 따라 60$\sim$200 nm사이였다. 임계회합농도는 소수성 PCL 블록길이가 증가함에 따라 감소하는 경향을 보였다. $^1H$-NMR 연구에서 PCL 블록은 내핵, PEG는 외피를 형성한 미셀구조로 형성되었음을 확인하였다. 약물의 방출은 약 2일간 지속되었으며 PCL블록길이와 약물함량이 증가함에 따라 감소하는 경향을 보였다. 항미생물 성능 실험에서 고분자 미셀은 기존의 NFX와 비슷한 독성을 보였다.