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전경용,김한성,한학수,조영일 ( Kyoung Yong Chun,Han Sung Kim,Hak Soo Han,Yung il Joe ) 한국공업화학회 1998 공업화학 Vol.9 No.2
용해성 PMDA/diamine/dianhydride 폴리이미드를 제조하여 특성을 고찰하고, 상용 알루미나 세라믹막내에 제조한 PMDA/diamine/dianhydride 용액을 코팅하여 기체투과특성을 알아보았다. Tg는 337∼358℃의 범위로 열적안정성은 우수함을 보였다. 용해성에 있어서는 NMP, DMAc, DMSO, THF, m-cresol의 극성 용매에 대해 대부분 좋은 결과를 보여 주었다. 알루미나막과 용해성 폴리이미드의 점착은 잘 이루어졌으며, 기체투과실험에 있어 6FDA를 포함한 폴리이미드의 경우 높은 투과도를 보였다. PDMA/1,3PDA/6FDA의 경우 질소투과도는 약 7.6×10^(-7) (㏖/㎡·Pa·s)의 값을 나타내었고, 질소에 대한 산소의 이상적 분리도, P(O₂/N₂)는 6.19였으며, P(H₂/N₂)의 경우는 약 70.0의 이상적 분리도를 보였다. The soluble polyimides(PMDA/diamine/dianhydride) were prepared and investigated. After coating the prepared PMDA/diamine/dianhydride solution into the commercial tubular alumina ceramic membranes, gas permeation characteristics was investigated T_g`s of the polyimides were in the range of 337∼358℃ and thermal stability was good. The polymer was soluble in NMP, DMAc, DMSO, THF, and m-cresol. The adhesion between the alumina membrane and the soluble polyimide was excellent. The soluble polyimide/alumina membranes containing 6FDA showed the highest permeability among others. The permeability of nitrogen of PMDA/1,3PDA/6FDA-alumina membrane was about 7.6×10^(-7) (㏖/㎡·Pa·s) in the gas permeation experiments. The ideal separation factor of O₂/N₂, and H₂/N₂ in PMDA/1,3PDA/6FDA-alumina membrane were 6.19, and 70.0, respectively.
전경용(Kyoung-Yong Chun),최욱(Wook Choi),한창수(Chang-Soo Han) 대한기계학회 2015 대한기계학회 춘추학술대회 Vol.2015 No.11
We demonstrate the formation of reversible thermo-responsive nanopore membrane which is constructed by using polymeric composites coated onto commercial membrane. The fabricated nanopore membrane sustains reversible thermo-responsive gating behavior in the selective temperature range. The nanopore is operated on the base of thermal expansion and contraction of composite layers. Thermo-response capability is characterized by electrochemistry method. Nanopore membrane is positioned between two glass reservoirs (0.1 M KCl) and Ag/AgCl electrodes are settled to apply potential and measure current. Current change and given potential difference provides the variation of ionic conductance. The ionic current is effectively distinguished in the nanopore composite membrane for heat-sensing.