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Sol-gel-derived potassium-based di-ureasils for "smart windows"

Sol-gel derived KCF3SO3-doped di-urea cross-linked poly(oxyethylene) (POE)/siloxane (di-ureasil) ormolytes with ∞ > n ≥ 1 (n is the number of oxyethylene units per K+ ion) have been analysed. Samples with n > 40 are thermally stable up to 310 ºC. At n ≥ 100, POE crystallites are present. At n = 5 a crystalline POE/KCF3SO3 complex with stoichiometry 1:1 is formed. In the xerogel with n =1 this complex coexists w...