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)
Claims9
A Ramjet solid fuel having an ignition temperature of less than 400° C., the fuel comprising a copolymer of 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;
- 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.
A method of making Ramjet solid fuel having an ignition temperature of less than 400° C., comprising the steps of:
- combining components to form a fuel composition, the components of the composition including a copolymer of 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;
- 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.
A method of using Ramjet solid fuel comprising LP-33 polysulfide polymer and, the method causing the Ramjet solid fuel to self-ignite at a temperature of less than 400° C., the method comprising the step of:
- forming a Ramjet solid fuel including a bis-(ethylene oxy) methane polysulfide polymer (BMPP) and hydroxyl-terminated polybutadiene (HTPB), the copolymer having a LP-33/HTPB weight ratio of from 1/3 to 3/1;
- and the fuel comprising at least 85 weight % copolymer.
- placing the Ramjet solid fuel in an ambient environment, and
- heating the Ramjet solid fuel with no external ignition source to cause the Ramjet solid fuel to self-ignite at no more than 400° C. by progressively increasing the temperature of the Ramjet solid fuel until ignition is achieved.
- 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.