Polymerization of energetic, cyclic ether monomers using boron t

Details Polymerization of energetic, cyclic ether monomers using boron t Polymerization of energetic, cyclic ether monomers using boron t

1994-04-13

1995-11-21

Krass, Frederick

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

From heterocyclic reactant containing as ring atoms oxygen,...

528417, 552 10, 564487, 564504, 568589, 568620, C08G 6522

Patent

active

054688418

ABSTRACT:
The present invention provides an improved method of carrying out cationic polymerization of cyclic ether monomers substituted with high-energy, electron-withdrawing pendant groups (e.g., BAMO and NMMO). Such cyclic ether monomers are polymerized with an initiator precursor (i.e., an alcohol) and boron trifluoride tetrahydrofuranate (BF.sub.3 .cndot.THF). It has been discovered that when boron trifluoride tetrahydrofuranate is used as a catalyst in the cationic polymerization of cyclic ether monomers substituted with high-energy, electron-withdrawing pendant groups (e.g., BAMO and NMMO), polymers are produced that have improved functionality and low poly-dispersity. The polymers formed using the method of the present invention are useful for forming cross-linked elastomers which, in turn, are useful for forming elastomeric binders for high-energy compositions, such as propellants, explosives, gasifiers or the like.

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Chemical Abstracts 93:186873, "Boron Trifluoride Etherate Catalyst", Gang Chen.
Chemical Abstracts 106:120258, "Mechanism of the Formation of Cyclic Oligomers", Grinevich et al.

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