English to French Tech/Engineering Chemistry; Chem Sci/Eng a polymer electrolyte fuel cell

After drying at 100°C for 4 hours and heating to 300°C over 30 minutes under nitrogen, a heat treatment was carried out at 300°C for 10 minutes to obtain a polyketal ketone membrane (membrane thickness 30 mm).

"In the same manner as in Example 1, except for charging 17.46 g (40 mmol) of the prepolymer a2 in place of the prepolymer a1, a polyketal ketone polymer and a polymer electrolyte membrane were prepared. The polyketal ketone polymer had a weight average molecular weight of 280,000.
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