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Synthesis of New Sulfonated Polyimide and Its Photo-Crosslinking for Polymer Electrolyte Membrane Fuel Cells 원문보기

Macromolecular research, v.17 no.10, 2009년, pp.725 - 728  

Liu, Hui (Department of Polymer) ,  Lee, Myong-Hoon (Department of Hydrogen and Fuel Cells Engineering, Specialized Graduate School, Chonbuk National University) ,  Lee, Jun-Ho (Department of Hydrogen and Fuel Cells Engineering, Specialized Graduate School, Chonbuk National University)

초록이 없습니다.

AI 본문요약
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제안 방법

  • The c-SPI membranes showed drastically improved hydrolytic stability of longer than 2000, 800 and 100 h at 25, 80 and 100 ℃, respectively. To evaluate whether the crosslinked membrane can withstand a stronger oxidizing environment during the fuel cell operation, the oxidative stabilities of u-SPI and c-SPI membranes were compared for an extended time period in Fen- tone reagent (3% H2O2 containing 2 ppm FeSO4) at 25 and 80 ℃, respectively (Table I). It was also found that the c-SPI membranes had better oxidative stability.

대상 데이터

  • In this work, 1, 6-hexanedithiol (HDT) and IRGACURE 907® were chosen as a crosslinkiii응 agent and photo-initiator, respectively. After the film casting of membrane, subsequent UV irradiation was performed on a dry SPI film containing crosslinking agent (10 wt% to SPI) and photo-initiator (5 wt% to SPI) by using a conventional high pressure Hg arc light source (198 mW/cm2) for 30 min.
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참고문헌 (22)

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  20. Synthesis of SPI: Copolyimide of NTDA/SODA and NTDA/ 3DAC with 0.5:0.5 mol ratio was synthesized and used throughout the experiments. SODA (0.28 mol), TEA (0.67 mol) and 3DAC (0.28 mol) were added successively to 4,500 mL of mcresol in a 3-neck flask with stirring. After SODA and 3DAC were completely dissolved, NTDA (0.56 mol) and benzoic acid (1.12 mol) were added. The mixture was stirred at 80 $^{\circ}C$ for 20 h and 180 $^{\circ}C$ for 24 h under nitrogen atmosphere and then the reaction mixture was precipitated into ethyl acetate. The fibrous precipitate was filtered and dried at 80 $^{\circ}C$ in vacuo. Preparation of SPI membranes: Firstly, uncrosslinked membranes were prepared by pouring the m-cresol solution of 10% SPI onto a glass plate (4 cm × 10 cm) and dried at room temperature for 3 d in air, 60 ${\circ}$ for 24 h and 140 $^{\circ}C$ for 24 h invacuo, respectively. The crosslinked membranes were obtained from SPI solution in m-cresol containing 10 wt% (to SPI) of 1,6-hexanedithiol (HDT) and 5 wt% (to SPI) of IRGACURE 907 ${\circledR}$ as a crosslinking agent and photo-initiator, respectively, following the above process with subsequent UV light irradiation (198 mW/cm2) for 30 min. The uncrosslinked and crosslinked membranes were acidified by immersing the membranes of TEA salt form into 1.0 M HCl solution at room temperature for 48 h, and then soaked in methanol and deionized water successively to remove excess acid and any impurity 

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