Chung, T. C., Chalkova, E., Zhang, Z., Wang, C., Fedkin, M. V., Komarneni, S., … & Lvov, S. N. (2008, August). FUEL 109-New proton conductive composite materials with inorganic and styrene grafted and sulfonated vdf/ctfe fluoropolymers. In Abstracts of Papers of the American Chemical Society (Vol. 236). 1155 16TH ST, NW, WASHINGTON, DC 20036 USA: AMER CHEMICAL SOC.
A new functionalized and crosslinkable P(VDF-CTFE) (vinylidene fluoride/chlorotrifluoroethylene copolymer) was synthesized using functional borane/oxygen initiator. and grafted with styrene (St) via atom transfer radical polymerization followed by partial or the whole sulfonation of phenyl groups. Materials with different composition and level of sulfonation were prepared and tested to balance proton conductivity, water swelling, and flexibility. The addition of hexafluoropropylene (HFP) to copolymer improved plasticity and swelling without compromising the conductivity. To understand the effect of different membrane components on its properties, thermal properties of composites have been investigated. It was found that the content of CTFE units, St and sulfonic groups effected membrane flexibility and swelling. Several classes of inorganic proton conductors with high water retention capability, including mesoporous materials (sulfonated alumina, zirconia, titania) were synthesized and tested for conductivity to introduce into polymeric material to improve membrane mechanical properties and conductivity.