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In a first step, a film of 100 cm2 with a thickness of 100 μm, dried beforehand at 110° C. under vacuum (10 mbar), was immersed in 200 ml of dichloroethane (DCE) and the whole mixture is brought to 60° C. In parallel, an anhydrous solution of trimethylsilyl chlorosulfonate was prepared by dissolving 47.2 g (0.434 moles) of trimethylsilane chloride and 42.2 g (0.36 moles) of ClSO3H, both the constituents being anhydrous, in 50 ml of dry DCE with magnetic stirring and under argon, for a duration of 30 minutes, with HCl formed being trapped.

1. customIn a first step, a film of 100 cm2 with a thickness of 100 μm, dried beforehand at 110° C. under vacuum (10 mbar)
2. customis brought to 60° C
3. customformed