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- 저자 : M. Jeevan Kumar Reddy (검색결과 4 건)
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Conductivity of Polypyrrole Composite Films Containing Lignosulfonic Acid
M. Jeevan Kumar Reddy,Bo Kyoung Shin(신보경),Do Sung Huh(허도성) 한국고분자학회 2017 폴리머 Vol.41 No.4
리그노술폰산(LSA)을 함유한 폴리피롤 복합체를 암모늄퍼셜페이트 개시제를 사용하여 합성하였다. 이 때 포함시키는 리그노술폰산의 양은 달리 하였다. 합성된 폴리피롤 복합체에서 LSA가 폴리피롤 속에서 강한 화학 결합을 하고 있음을 UV와 IR 스펙트럼 방법과 표면성상 분석을 통해 확인하였다. 복합체의 온도 의존성 전도도 특성이 연구되었으며, 아울러 전도도 값을 통하여 전자 이동에 관한 활성화 에너지를 계산해보았다. 전기전도도는 LSA의 양이 증가할수록 증가하였는데, 이 결과는 LSA에 의한 전자 활성에 기인하는 것으로 여겨진다. Polypyrrole (PPy) composites containing lignosulfonic acid (LSA) were prepared via the polymerization of pyrrole monomer with different concentrations (wt%) of LSA sodium salt using ammonium persulfate as an oxidant. The strong interaction of LSA with PPy to form PPy-LSA composites was supported by spectral characterization and surface morphological studies. The electrical properties of the composite films were examined through temperature-dependent direct current conductivity measurements at 300-500 K to understand the conduction behavior of the composites. The activation energy for electron transport was also calculated based on the conductivity data. The conductivity of the films was increased by increasing LSA concentration (wt%) in the PPy- LSA composites. The result can be attributed to the increased mobility of the charge carriers by the increased concentration of LSA in the composites. The incorporation of LSA in PPy can cause the cost-effective transformation of the conductive polymer of PPy into a biodegradable polymer.
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Anji Reddy Polu,이희우,Modigunta Jeevan Kumar Reddy,A.M. Shanmugharaj,류승훈,김동규 한국공업화학회 2017 Journal of Industrial and Engineering Chemistry Vol.45 No.-
For the first time, the consequences of organic-inorganic hybrid nanoparticle polyhedral oligomericsilsesquioxane-polyethylene glycol (POSS-PEG(n = 4)) on the physicochemical and electrochemicalproperties of poly(ethylene oxide) (PEO)-lithium difluoro(oxalato)borate (LiDFOB) based nanocompositesolid polymer electrolyte (NSPE) membranes were systematically prepared and utilized as an activeseparator for battery applications. The thermal stability and structural properties of the prepared NSPEmembranes were analyzed by means of differential scanning calorimetry (DSC), thermogravimetry (TG)and X-ray diffraction (XRD) analyses. The morphological changes by POSS-PEG in polymer electrolytemembranes were investigated by field emission scanning electron microscopy (FE-SEM) andtransmission electron microscopy (TEM). The incorporation of POSS-PEG greatly enhanced the ionicconductivity, mechanical integrity and compatibility. The maximum ambient temperature ionicconductivity was found to be in the range of 7.28 10 5 S/cm for 40 wt% POSS-PEG. Finally, the solidstate lithiumcell was assembled as Li/NSPE/LiCoO2. The cell delivered a maximum discharge capacity of187 mAh g 1 at 0.1C-rate with very good capacity retention up to 50 cycles. The test results indicatedthat the electrolyte is found to be a better candidate than those reported earlier.
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Polu, A.R.,Rhee, H.W.,Jeevan Kumar Reddy, M.,Shanmugharaj, A.M.,Ryu, S.H.,Kim, D.K. THE KOREAN SOCIETY OF INDUSTRIAL AND ENGINEERING 2017 JOURNAL OF INDUSTRIAL AND ENGINEERING CHEMISTRY -S Vol.45 No.-
<P>For the first time, the consequences of organic-inorganic hybrid nanoparticle polyhedral oligomeric silsesquioxane-polyethylene glycol (POSS-PEG(n = 4)) on the physicochemical and electrochemical properties of polyethylene oxide) (PEO)-lithium difluoro(oxalato)borate (LiDFOB) based nanocomposite solid polymer electrolyte (NSPE) membranes were systematically prepared and utilized as an active separator for battery applications. The thermal stability and structural properties of the prepared NSPE membranes were analyzed by means of differential scanning calorimetry (DSC), thermogravimetry (TG) and X-ray diffraction (XRD) analyses. The morphological changes by POSS-PEG in polymer electrolyte membranes were investigated by field emission scanning electron microscopy,(FE-SEM) and transmission electron microscopy (TEM). The incorporation of POSS-PEG greatly enhanced the ionic conductivity, mechanical integrity and compatibility. The maximum ambient temperature ionic conductivity was found to be in the range of 7.28 x 10(-5) S/cm for 40 wt% POSS-PEG. Finally, the solid state lithium cell was assembled as Li/NSPE/LiCoO2. The cell delivered a maximum discharge capacity of 187 mAh g(-1) at 0.1C-rate with very good capacity retention up to 50 cycles. The test results indicated that the electrolyte is found to be a better candidate than those reported earlier. (C) 2016 The Korean Society of Industrial and Engineering Chemistry. Published by Elsevier B.V. All rights reserved.</P>
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