Effect of mixed monomers on the synthesis of ion-exchange membranes by radiation-induced grafting

1985 ◽  
Vol 30 (3) ◽  
pp. 1277-1284 ◽  
Author(s):  
Hideki Omichi ◽  
Jiro Okamoto
Keyword(s):  
Ion Exchange ◽  
Ion Exchange Membranes ◽  
Radiation Induced ◽  
Radiation Induced Grafting

scholarly journals CHARACTERIZATION OF AMPHOTERIC ION EXCHANGE RESIN PREPARED BY RADIATION-INDUCED GRAFTING POLYMERIZATION

2012 ◽  
Vol 012 (11) ◽  
pp. 1276-1282 ◽  
Author(s):  
Jun Ma ◽  
Hu Guo-wen ◽  
Jing Peng ◽  
Yu Wang ◽  
Li Jiu-qiang ◽  
...  
Keyword(s):  
Ion Exchange ◽  
Exchange Resin ◽  
Ion Exchange Resin ◽  
Grafting Polymerization ◽  
Radiation Induced ◽  
Radiation Induced Grafting

Preparation of Highly Stable Ion Exchange Membranes by Radiation-Induced Graft Copolymerization of Styrene and Bis(vinyl phenyl)ethane Into Crosslinked Polytetrafluoroethylene Films

2006 ◽  
Vol 4 (1) ◽  
pp. 56-64 ◽  
Author(s):  
Tetsuya Yamaki ◽  
Junichi Tsukada ◽  
Masaharu Asano ◽  
Ryoichi Katakai ◽  
Masaru Yoshida
Keyword(s):  
Ion Exchange ◽  
Proton Conductivity ◽  
Water Uptake ◽  
Graft Copolymerization ◽  
Exchange Capacity ◽  
Polymer Electrolyte Fuel Cells ◽  
Ion Exchange Membranes ◽  
Aromatic Rings ◽  
Ion Exchange Capacity ◽  
Radiation Induced

We prepared novel ion exchange membranes for possible use in polymer electrolyte fuel cells (PEFCs) by the radiation-induced graft copolymerization of styrene and new crosslinker bis(vinyl phenyl)ethane (BVPE) into crosslinked polytetrafluoroethylene (cPTFE) films and subsequent sulfonation and then investigated their water uptake, proton conductivity, and stability in an oxidizing environment. In contrast to the conventional crosslinker, divinylbenzene (DVB), the degree of grafting of styrene∕BVPE increased in spite of high crosslinker concentrations in the reacting solution (up to 70mol%). Quantitative sulfonation of the aromatic rings in the crosslinked graft chains resulted in the preparation of membranes with a high ion exchange capacity that reached 2.9meq∕g. The bulk properties of the membranes were found to exceed those of Nafion membranes except for chemical stability. The emphasis was on the fact that the BVPE-crosslinked membranes exhibited the higher stability in the H2O2 solution at 60°C compared to the noncrosslinked and DVB-crosslinked ones, as well as decreased water uptake and reasonable proton conductivity. These results are rationalized by considering the reactivity between styrene and the crosslinker, which is an important factor determining the distribution of the crosslinks in the graft component. In the case of BVPE, the crosslinks at a high density were homogeneously incorporated even into the interior of the membrane because of its compatibility with styrene while the far too reactive DVB led to a crosslink formation only near the surface. The combination of both the cPTFE main chain and BVPE-based grafts, i.e., a perfect “double” crosslinking structure, is likely to effectively improve the membrane performances for PEFC applications.

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