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Dukjoon Kim(김덕준) 한국고분자학회 2021 한국고분자학회 학술대회 연구논문 초록집 Vol.46 No.1
Solid polymer electrolyte (SPE) was prepared from PAEK-g-PEG and PYR14-TFSI IL. Interfacial compatibility, lithium ion conductivity and transference number, thermal, mechanical and dimensional stability for lithium battery applications were investigated and correlated to ion cluster dimension examined by SAXS. The synthesized SPE illustrated thermal degradation temperature over 200 ℃, elongation at break of 250% and negligible dimensional change at 120 ℃. This flexible SPE exhibited the highest ion conductivity of ~ 1×10<sup>-3</sup> S cm<sup>-1</sup> at room temperature. As the active electrode materials such as LCO and NMC622 were quite compatible with SPE, the battery cells fabricated by binding the SPE and cathode layer showed excellent cell performance of 139.01 mAh g<sup>-1</sup> (LCO) and 158.15 mAh g<sup>-1</sup> (NMC 622) at 0.1 C. When this multi-functional SPE was applied to the lithium sulfur battery system, the cell discharge capacity was even higher than 925 mAh g<sup>-1</sup> at 0.1C with cyclic stability (>50 cycles).
Metal-ion Adsorption by Hybrid Gel based on Polyaspartamide and Alginate
Quang Tri Bui(쾅트리뷰),Young Sil Jeon(전영실),Dukjoon Kim(김덕준),Ji-Heung Kim(김지흥) 한국고분자학회 2016 폴리머 Vol.40 No.2
폴리(2-히드록시에틸 아스팔트아미드)(PHEA)와 알지네이트(Alg) 유도체로부터 클릭반응에 의한 가교젤을 제조하고, 이 하이드로젤을 수용액상의 중금속이온 제거를 위한 흡착제로 사용하였다. PHEA/Alg 하이브리드젤은 중금속이온 Cu(II)와 Ni(II)에 대해 각각 75 mg/g과 60 mg/g의 높은 흡착능을 보였다. 하이드로젤은 이온함유 수용액에서 약 60~80 g/g의 수팽윤비를 나타내었다. 흡착 거동에 미치는 접촉시간, pH, 온도, 및 농도의 영향을 조사하였다. SEM과 FTIR을 통해 젤의 다공성 모폴로지 및 금속이온과 고분자 구조간의 상호작용을 고찰하였으며, 또한 농도에 따른 흡착량 데이터로부터 흡착등온선(isotherm)을 이론식에 적용하여 분석하였다. 그 결과로 Cu(II)와 Ni(II)의 흡착거동은 Freundlich보다는 Langmuir 모델에 잘 부합하였으며, 동력학적으로는 유사 2차 동역학적 모델(pseudosecond-order kinetic model)로 더 정확하게 묘사할 수 있음을 알았다. A hydrogel based on poly(2-hydroxyethyl aspartamide) (PHEA) and alginate (Alg) derivatives, prepared by the ‘click’ reaction, has been utilized as a sorbent for the removal of metal-ions from aqueous media. PHEA/Alg hybrid gel exhibited high adsorption capacity for Cu(II) and Ni(II) with 75 and 60 mg/g, respectively. The hybrid gel possessed swelling degrees in the range of 60~80 g/g in ion-containing (2 wt/v%) water. The effects of pH, initial metal-ion concentration, temperature, and contact time, on the adsorption were investigated. The gel morphology and interaction between polymer and metal-ion were characterized by using SEM and FTIR spectroscopy. The kinetics and adsorption isotherms were better fitted to Langmuir model than Freundlich model, and pseudo-second-order adsorption kinetics described well the adsorption process.
Kim, Dukjoon 成均館大學校 科學技術硏究所 1995 論文集 Vol.46 No.2
유리기판에 코팅되어져 아세톤에 의해 팽윤되어지는 poly(dimethyl siloxane) (PDMS)필름에 아세톤과 함께 침투되는 dye의 확산거동을 total internal reflection fluorescence(TIRE) 방법을 이용하여 살펴보았다. Dye의 확산에 따른 fluorescence 강도분율과 dye의 확산 질량분율을 Fick의 확산 모델을 이용해 예측하였다. 확산모델에 의해 예측된 TIRF 거동을 실제의 TIRF 실험데이테와 일치시킴으로써 PDMS 필름내에서의 dye 확산계수를 얻을 수 있었다. TIRF 실험데이터 중 fluorescence의 강도변화는 I) 필름내에서의 감쇄파와 ii) 산란이 그 원인이 되었다. Dye의 확산계수는 2.8 x 10 exp(-8)㎠/s 이었다. The dye diffusion behavior in the acetone induced swelling poly (dimethyl siloxane) (PDMS) film coated on the glass slide was investigated using total internal reflection fluorescence (TIRF) technnique. The fractional fluorescence intensity and fractional dye mass uptake were predicted from the Fickian diffusion approximates. The dye diffusion coefficient inside the PDMS sample was determined from the best curve fits of the predictive fluorescent intensities founded on the Fickian model to the experimental TIRF data. The fluorescent intensity in the experimental TIRF was influenced by i.) the evanescence wave and ii) the scattering inside the film. The resulting dye diffusion coefficient was 2.8 x 10 exp(-8) ㎠/s.