http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
Preparation of flexible PLA/PEG-POSS nanocomposites by melt blending and radiation crosslinking
Jung, C.H.,Hwang, I.T.,Jung, C.H.,Choi, J.H. Pergamon 2014 Radiation physics and chemistry Vol.102 No.-
In this study, poly(lactic acid) (PLA)/poly(ethylene glycol)-functionalized polyhedral oligomeric silsesquioxane (PEG-POSS) nanocomposites with or without triallyl isocyanurate (TAIC) were investigated by melt blending and electron beam irradiation to enhance the flexibility of PLA. Based on the results of the crosslinking degree measurements, the PLA/PEG-POSS nanocomposites were crosslinked by electron beam irradiation in the presence of triallyl isocyanurate (TAIC) and their crosslinking degree reached up to 80% based on the absorbed dose and their compositions. From the results of the FE-SEM and EDX Si-mapping, the crosslinked PLA/PEG-POSS nanocomposites were homogenous without a micro-phase separation or radiation-induced morphological change. Based on the results of the tensile test, the PLA/PEG-POSS nanocomposites containing 15wt% PEG-POSS exhibited the highest flexibility, and their tensile strength showed a maximum value of 44.5MPa after electron beam irradiation at an absorbed dose of 100kGy in the presence of TAIC, which is comparable to non-biodegradable polypropylene. The results of the dynamic mechanical analysis revealed that the crosslinked PLA/PEG-POSS nanocomposites exhibited a higher thermal resistance above their melting temperature in comparison to that of the neat PLA, although their glass transition temperature was lower than that of the neat PLA. The enzymatic biodegradation test revealed that the PLA/PEG-POSS nanocomposites were biodegradable even though their biodegradability was deteriorated in comparison to that of the neat PLA.
Polu, A.R.,Rhee, H.W. Korean Society of Industrial and Engineering Chemi 2015 Journal of industrial and engineering chemistry Vol.31 No.-
We successfully prepared the nanocomposite solid polymer electrolytes based on poly(ethylene oxide) (PEO)/polyhedral oligomeric silsesquioxane-polyethylene glycol (POSS-PEG) complexed with LiN(SO<SUB>2</SUB>CF<SUB>3</SUB>)<SUB>2</SUB> (LiTFSI) salt and studied the effect of POSS-PEG (n=13.3) hybrid nanoparticles on structural, thermal, mechanical and ionic conductivity properties. The crystallinity of the nanocomposite solid polymer electrolytes has been characterized by X-ray diffraction (XRD). FTIR studies showed the evidence of the complexation between PEO, LiTFSI and POSS-PEG. Differential scanning calorimetry (DSC) was used to study their glass transition and melting behaviors and to measure their respective degrees of crystallinity. The degree of crystallinity reduced with POSS-PEG content, indicating restricted segmental motion of the polymer chains. The Young's modulus increased from 0.076 to 0.19MPa with the addition of POSS-PEG. Ionic conductivity studies reveal that solid polymer electrolyte with 30wt% of POSS-PEG has the highest ionic conductivity of 5.05x10<SUP>-5</SUP>S/cm at room temperature (23<SUP>o</SUP>C). The temperature dependence conductivity studies showed that the samples seemed to obey the Arrhenius behavior.
Anji Reddy Polu,이희우 한국공업화학회 2015 Journal of Industrial and Engineering Chemistry Vol.31 No.-
We successfully prepared the nanocomposite solid polymer electrolytes based on poly(ethylene oxide)(PEO)/polyhedral oligomeric silsesquioxane-polyethylene glycol (POSS-PEG) complexed with LiN(-SO2CF3)2 (LiTFSI) salt and studied the effect of POSS-PEG (n = 13.3) hybrid nanoparticles on structural,thermal, mechanical and ionic conductivity properties. The crystallinity of the nanocomposite solidpolymer electrolytes has been characterized by X-ray diffraction (XRD). FTIR studies showed theevidence of the complexation between PEO, LiTFSI and POSS-PEG. Differential scanning calorimetry(DSC) was used to study their glass transition and melting behaviors and to measure their respectivedegrees of crystallinity. The degree of crystallinity reduced with POSS-PEG content, indicating restrictedsegmental motion of the polymer chains. The Young’s modulus increased from 0.076 to 0.19 MPa withthe addition of POSS-PEG. Ionic conductivity studies reveal that solid polymer electrolyte with 30 wt% ofPOSS-PEG has the highest ionic conductivity of 5.05 10 5 S/cm at room temperature (23 8C). Thetemperature dependence conductivity studies showed that the samples seemed to obey the Arrheniusbehavior.
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>
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.
2LO-15 이산화탄소 포집을 위한 POSS-PEG 합성 및 복합막 제조와 특성평가
김지현,조진우,남상용 한국공업화학회 2017 한국공업화학회 연구논문 초록집 Vol.2017 No.1
최근 전세계적으로 이산화탄소 분리기술에 관한 연구가 활발하게 이루어지고 있다. 그 중 특히 분리막을 이용한 이산화탄소 분리는 타 방식에 비해 다양한 장점으로 광범위하게 연구되고 있다. 본 연구에서는 고선택성을 지닌 Polyhedral oligomeric silsesquioxane(POSS)과 고투과성을 지닌 Poly(ethylene glycol)으로 이산화탄소 포집에 우수한 성능을 나타내는 POSS-PEG를 합성하고 특성평가하는 것에 중점을 두었다. 1H-NMR 스펙트럼과 FT-IR 스펙트럼을 활용하여 합성의 유무를 확인하였고 PAN지지체에 코팅하는 방식으로 복합막을 제조하였다. 기체 특성평가를 실시하기 위해 기체투과에 필요한 실험모듈을 이용하여 이산화탄소 투과특성을 평가하였다.
Silisesquioxane-Poly(ethylene glycol) 분리막의 제조 및 기체 투과 성능
김지현,임광섭,남상용 한국공업화학회 2019 한국공업화학회 연구논문 초록집 Vol.2019 No.0
최근 전 세계적으로 지구온난화 및 기후변화에 대응할 기술에 대한 관심이 증가하고 있다. 그에 따라 오랜 기후변화와 관련하여 지구온난화를 늦추고자 온실가스 중 대부분의 비율을 차지하고 있는 이산화탄소를 분리 및 저장 할 수 있는 연구가 활발하다. 본 연구에서는 고 투과성을 지닌 Polyhedral oligomeric silsesquioxane (POSS)와 이산화탄소에 대한 선택도를 지닌 Poly(ethylene glycol)을 이용하여 POSS-PEG 공중합체를 합성하였고 이를 다공성 지지체 위에 코팅하여 복합막을 제조하였다. 특성평가로는 NMR과 FT-IR 스펙트럼으로 합성의 유무를 확인한 뒤 복합막에 N<sub>2</sub>, O<sub>2</sub>, CO<sub>2</sub> 세 종류의 기체를 투과함으로써 성능을 확인하였다. single gas를 투과시켰을 때 CO<sub>2</sub>/N<sub>2</sub> 선택도 24, Mixture gas를 투과시켰을 때 최대 70%의 CO<sub>2</sub> 분리성능을 나타내었다.