Graft polymer electrolyte

Shen M, Roy S, Kuhlmann JW, Scott K, Lovell K, Horsfall JA. 2004. Grafted polymer electrolyte membrane for direct methanol fuel cells. J Memb Sci 251 121-130. 

Chen, J., M. Asano, T. Yamaki et al. 2006. Effect of crosslinkers on the preparation and properties of ETFE-based radiation-grafted polymer electrolyte membranes. Journal of Applied Polymer Science 100 4565-4574. 

M. Shen, S. Roy, J. W. Kuhlmann, K. Scott, K. Lovell, and J. A. Horsfall, Grafted polymer electrolyte membrane for direct methanol fuel cell, J. Membr. Sci. 251(1-2), 121-130... 

Chen, J., Septiani, U., Asano, M., Maekawa, Y., Kubota, H., Yoshida, M. (2007b) Comparative study on the preparation and properties of radiation-grafted polymer electrolyte membranes based on fluoropolymer films. J. Appl. Polym. Sd. 103, 1966-1972. 

We have also undertaken research work on graft polymer electrolytes. Given that both lowering the glass transition temperature (Eg) and eliminating the crystalline tendency of polymer matrix are efficient ways to improve ion conductivity, a first goal focused on the preparation of comblike polyethers (Ye et al, 2005). TWo monomers, 3-(2-cyano ethoxy)methyl-... 

Gubler, L., S. A. Giirsel, and G. G. Scherer, Radiation-grafted membranes for polymer electrolyte fuel cells. Journal Fuel Cells, August 2005. 

Nezu, S., Seko, H., Gondo, M. and Ito, N. 1996. High performance radiation-grafted membranes and electrodes for polymer electrolyte fuel cells. Department of Energy (DOE). Fuel cell seminar, Orlando. 

Patri, M., Hande, V. R., Phadnis, S. and Deb, P. C. 2004. Radiation-grafted solid polymer electrolyte membrane thermal and mechanical properties of sulfonated fluormated ethylene propylene copolymer (FEP)-graft-acrylic acid membranes. Polymers for Advanced Technologies 15 622-627. 

Biichi, F. N., Gupta, B., Haas, O. and Scherer, G. G. 1995. Study of radiation-grafted FEP-g-polystyrene membranes as polymer electrolytes in fuel cells. Electrochimica Acta 40 345-353. 

Ding, J. F, Chuy, C. and Holdcroft, S. 2002. Solid polymer electrolytes based on ionic graft polymers Effect of graft chain length on nano-structured, ionic networks. Advanced Functional Materials 12 389-394. 

Alternative solid polymer electrolytes are also being evaluated to assess advantages in cost and performance. The Nafion 120 is an extremely stable (and thus long-lived) material under water electrolysis operating conditions. Any alternative SPE considered viable must have equivalent life stability. A radiation-grafted tri-fluorostyrene was extensively evaluated, but demonstrated insufficient operational stability to be considered as a viable alternative. The search for other alternatives is continuing. 

A publication by the Paul Scherrer Institute reports progress in preparing membrane/electrode assemblies for polymer electrolyte fuel cells based on radiation-grafted FEP PSSA membranes [95]. Hot-pressing with Nation was used to improve the interfaces. These improved MEAs showed performance data comparable to those of MEAs based on Nafion 112 (Figure 27.58) and an service-life in H2/O2 fuel cells of more than 200 h at 60°C and 500 mA cm. ... 

Ostrovskii and coworkers have also reported the application of PVDF-SPS proton conducting materials in Hj/Og polymer electrolyte fuel cells (PEFC). Proton conductivities as high as 0.13 S cm at room temperature were measured. The PVDF-SPS materials were fabricated by electron irradiation followed by grafting and sulfonation. It is well known that y rays, electrons, or... 

---