화학공학소재연구정보센터
학회 한국고분자학회
학술대회 2005년 봄 (04/14 ~ 04/15, 전경련회관)
권호 30권 1호, p.403
발표분야 기능성 고분자
제목 Preparation and characterization of Nafion/base polymer composite membrane for DMFC application
초록 The most significant feature of PFSA (perfluorosulfonic acid) membrane is its high proton conductivity. This property comes from the unique structure of PFSA membrane. As water is absorbed in membrane, its hydrophilic domain size becomes bigger. Water and methanol can penetrate membrane through water channel and it can also provide the passage of proton. The main drawback of PFSA membrane is methanol permeability. Strong sulfonic acid of PFSA membrane induces considerable phase separation and thus results in big size of hydrated cluster and water passage.
Nafion is one of the PFSA membrane. Nafion 5wt% solution, the solvents are alcohol and water, is evaporated and then recast Nafion is prepared. We modified Nafion, using base polymer (PEI, P4VP). Nafion/base polymer composite membranes decreased the size of hydrated cluster. Water uptake of composite membrane was measured from the weight change before and after soaking the membrane in deionized water for a day. Water uptake decreased with increasing basic polymer.
Thermal properties were investigated using TGA. Proton conductivity of the membrane was measured using an impedance spectroscopy. Methanol permeability was measured using a diffusion cell with a refractive index (RI) detector to monitor the variation of methanol concentration in the permeated compartment. Both proton conductivity and methanol permeability decreased with increasing the concentration of the base polymer.
저자 강동훈, 김덕준
소속 성균관대
키워드 fuelcell; DMFC
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