Sulfonated fluorinated block copolymers having diphenyl units were
mixed with the sulfonated cationic conductive polymers at an optimum mixing ratio
to form hybrid membranes for fuel cells and their characteristics were studied.
2D and 3D AFM topology analysis confirmed that the number of hydrophilic units
in the hybrid membrane was improved. Through the FE-SEM, the microstructure
of the hybrid membrane implied hydrogen bonding and pi-pi interactions, and
EDAX confirmed carbon, oxygen, sulfur, and fluorine. The thermogravimetric
analysis showed that the hybrid membrane was thermally stable and the hydrophilicity
of the hybrid membrane was increased by the contact angle of water
droplets. As a result, it was confirmed that the cation conductivity increased by
a factor of 1.8 times as the number of acidic domains in the hybrid film increased.