Abstract:Three different kinds of crosslinked proton exchange membranes were prepared based on sulfonated poly (ether ether ketone) (SPEEK) and three types siloxane diamine. The crosslinked structure was confirmed by Fourier transform infrared spectroscopy. Mechanical properties, thermal stability, and proton conductivity of the crosslinked proton exchange membranes were conducted by universal material testing machine, thermogravimetric analyzer (TG), and electrochemical workstation. Dimensional stability in water, methanol resistance performance, water uptake and ion exchange capacity were studied in detail. The results show that mechanical properties, methanol resistance performance and dimensional stability of proton exchange membranes are enhanced obviously due to crosslinking modification. The crosslinked proton membranes prepared with phenyl containing siloxane diamine (PMS) have better comprehensive performance compared to SPEEK. The methanol permeability of SPEEK modified with PMS is 1.89×10-7 cm2/s, which is much lower than that of SPEEK 2.28×10-6 cm2/s. Moreover, the effective selectivity of SPEEK/PMS crosslinked proton exchange membrane is 5.6 times of that of SPEEK and the swelling ratio decreases by 59.7%.