Synthesis of α,ω-Bifunctional Fluorine-Containing Polysiloxanes by Hydrosilation Reaction

Abstract α,ω-Bis(trifluoroacetamide)-terminated polysiloxanes containing Si–H bonds were prepared by cationic equilibration reaction of the cyclic tetramers, octamethylcyclotetrasiloxane and 1,3,5,7-tetramethyl-cyclotetrasiloxane, and bis(3-aminopropyl)tetramethyldisiloxane, catalyzed by trifluoroacetic acid. The pendant Si–H silane bonds were then added quantitatively to 3,3,4,4,5,5,5-heptafluoro-1-pentene by using chloroplatinic acid catalysis. The end groups of these fluorine-containing polysiloxanes were then hydrolyzed to unprotected primary amino groups. Carboxyl- or hydroxyl-terminated polysiloxanes were also prepared by similar methods. Fluorine-containing siloxane-urea segmented copolymers were synthesized by using α,ω-diamino-terminated polysiloxanes.