Copolymerized bis-(ethylene oxy) methane polysulfide polymer and hydroxyl terminated poly butadiene as a solid fueled ramjet fuel
OwnerBrian McDonald, Jeremy Rice +1inventors
InventorsBrian McDonald, Jeremy Rice, John Stewart
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Abstract
The application relates to a Ramjet solid fuel having an ignition temperature of less than 400° C., the fuel comprising a bis-(ethylene oxy) methane polysulfide polymer (BMPP) and hydroxyl-terminated polybutadiene (HTPB), the copolymer having a BMPP/HTPB weight ratio of from 1/3 to 3/1; and the fuel comprising at least 85 weight % copolymer. The BMPP comprises from 5 to 8 weight percent mercaptan. Furthermore, the BMPP is selected from HS(RSS)aCH2CH((SSR)cCSH)CH2(SSR)bSH a) where R═—(CH2)2OCH2O(CH2)2— and a+b+c<7; and H(SC2H4OCH2OC2H4S)nH where n=7. b)
Claims2
A Ramjet solid fuel having an ignition temperature of less than 400° C., the fuel consisting essentially of a copolymer of bis-(ethylene oxy) methane polysulfide polymer (BMPP) and hydroxyl-terminated polybutadiene (HTPB);
- isophorone diisocyanate (IDPI);
- and butyltin;
- the copolymer having a BMPP/HTPB weight ratio of from 1/3 to 3/1;
- and the fuel thus consisting essentially of between 83 and 87 weight % copolymer, between 11 and 16 weight % IPDI (Isophorone diisocyanate), and between 0 and 2% butyltin;
- wherein the BMPP comprises from 5 to 8 weight percent mercaptan;
- and wherein BMPP is selected from
- HS(RSS)aCH2CH((SSR)cCSH)CH2(SSR)bSH a)
- Where R═—(CH2)2OCH2O(CH2)2—
- And a+b+c<7;
- and
- H(SC2H4OCH2OC2H4S)nH b)
- Where n=7.
Dependencies are inferred from the claim text.