Multiblock copolymer sequence of dihydroxytelechelics comprising at least one polytetrahydrofuran block and at least two polymer diol blocks, useful for preparing polyurethanes, which is useful as a binder for energetic materials

摘要

Multiblock copolymer sequence of dihydroxytelechelics (A) comprising at least one polytetrahydrofuran block and at least two polymer diol blocks, where the polymer diol contains primary hydroxyl function, is claimed. Multiblock copolymer sequence of dihydroxytelechelics (A) comprising at least one polytetrahydrofuran block and at least two polymer diol blocks, where the copolymer has polytetrahydrofuran-polyethylene oxide structure of formula (HO-pOE-b-pTHF-b-pOE-OH) (I); and the polymer diol contains primary hydroxyl function, is claimed. pTHF : polytetrahydrofuran block; and pOE : poly(ethylene oxide) block. An independent claim is included for a process for preparing (A) comprising: cationic polymerization of tetrahydrofuran under anhydrous inert atmosphere, in the presence of at least one primer that generates two reactive ends to the macromolecule, to obtain a polytetrahydrofuran difunctional oxonium (a); and reaction of at least one polymer diol having primary hydroxyl functions with (a).