Nitramine-containing homopolymers and co-polymers and a process for the preparation thereof
First Claim
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1. A nitramine-containing polymer characterized by an advantageous combination of a low viscosity and a low glass transition temperature and represented by the following empirical structural formula:
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space="preserve" listing-type="equation">[(OOCCH.sub.2 CH.sub.2 --R--CH.sub.2 CH.sub.2 CO).sub.x (OOCCH.sub.2 CH.sub.2 --R'"'"'--CH.sub.2 CH.sub.2 CO).sub.y (OR")].sub.nwherein R and R'"'"' are the same or different moieties selected from the group consisting of --N(NO2)--, --N(NO2)CH2 CH2 N(NO2)--, and --N(NO2)ZN(NO2)--, wherein Z is a linear or branched-chain hydrocarbon having between 3 and 10 carbon atoms, with the proviso that at least one R or R'"'"' moiety on average per molecule of said polymer must be other than --N(NO2)CH2 CH2 N(NO2)--, and wherein x represents a mole fraction having a value between 0 and 1, y represents a mole fraction equal to 1 minus x and having a value between 0 and 1, R" is a linear or branched chain alkylene or alkylene ether radical having between 2 and 12 carbon atoms and having primary or secondary carbon atoms at said radical'"'"'s points of attachment in said polymer, and n has a value between 2 and 50, said polymer being prepared by reacting a nitramine-containing dicarboxylic acid with a diol, said nitramine-containing dicarboxylic acid being selected from the group consisting of 4,7-dinitraza-1,10-decanedioic acid (DNDA);
5-methyl-4,7-dinitraza-1,10-decanedioic acid (MDNDA);
4-nitraza-1,7-heptanedioic acid (NHDA);
4,8-dinitraza-1,11-undecanedioic acid, and combinations thereof; and
said diol being selected from the group consisting of ethylene glycol, propylene glycol, 1,4-butane diol, 1,6-hexane diol, diethylene glycol and combinations thereof.
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Abstract
Energetic binders, and, more specifically, a class of nitramine-containing homopolymers and co-polymers characterized by favorable viscosity and glass transition temperature are prepared.
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Citations
18 Claims
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1. A nitramine-containing polymer characterized by an advantageous combination of a low viscosity and a low glass transition temperature and represented by the following empirical structural formula:
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space="preserve" listing-type="equation">[(OOCCH.sub.2 CH.sub.2 --R--CH.sub.2 CH.sub.2 CO).sub.x (OOCCH.sub.2 CH.sub.2 --R'"'"'--CH.sub.2 CH.sub.2 CO).sub.y (OR")].sub.nwherein R and R'"'"' are the same or different moieties selected from the group consisting of --N(NO2)--, --N(NO2)CH2 CH2 N(NO2)--, and --N(NO2)ZN(NO2)--, wherein Z is a linear or branched-chain hydrocarbon having between 3 and 10 carbon atoms, with the proviso that at least one R or R'"'"' moiety on average per molecule of said polymer must be other than --N(NO2)CH2 CH2 N(NO2)--, and wherein x represents a mole fraction having a value between 0 and 1, y represents a mole fraction equal to 1 minus x and having a value between 0 and 1, R" is a linear or branched chain alkylene or alkylene ether radical having between 2 and 12 carbon atoms and having primary or secondary carbon atoms at said radical'"'"'s points of attachment in said polymer, and n has a value between 2 and 50, said polymer being prepared by reacting a nitramine-containing dicarboxylic acid with a diol, said nitramine-containing dicarboxylic acid being selected from the group consisting of 4,7-dinitraza-1,10-decanedioic acid (DNDA);
5-methyl-4,7-dinitraza-1,10-decanedioic acid (MDNDA);
4-nitraza-1,7-heptanedioic acid (NHDA);
4,8-dinitraza-1,11-undecanedioic acid, and combinations thereof; and
said diol being selected from the group consisting of ethylene glycol, propylene glycol, 1,4-butane diol, 1,6-hexane diol, diethylene glycol and combinations thereof. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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- 11. A process for producing a nitramine-containing polymer which comprises the steps of reacting a nitramine-containing dicarboxylic acid monomer with a diol monomer in the presence of an acid catalyst by a melt polymerization reaction to form said nitramine-containing polymer while removing by-product water during the course of said reaction.
Specification