Polyolefin elastomers are widely employed commodity polymers. There remains a desire to expand the structural diversity of polyolefin elastomers to facilitate their use in additional applications. Polyolefin elastomers may be graft copolymers that comprise: a first polymer chain comprising at least a first olefinic monomer comprising isobutylene and a second olefinic monomer bearing a benzylic carbon atom or an allylic carbon atom, and a second polymer chain bonded to the benzylic carbon atom or the allylic carbon atom of the first polymer chain. The second polymer chain comprises at least one monomer that is not present in the first polymer chain. The second polymer chain may be bonded to the first polymer chain by generating a carbanion upon the benzylic carbon atom or the allylic carbon atom and growing the second polymer chain by anionic polymerization.

Polyolefin elastomers are widely employed commodity polymers. There remains a desire to expand the structural diversity of polyolefin elastomers to facilitate their use in additional applications. Polyolefin elastomers may be graft copolymers that comprise: a first polymer chain comprising at least a first olefinic monomer comprising isobutylene and a second olefinic monomer bearing a benzylic carbon atom or an allylic carbon atom, and a second polymer chain bonded to the benzylic carbon atom or the allylic carbon atom of the first polymer chain. The second polymer chain comprises at least one monomer that is not present in the first polymer chain. The second polymer chain may be bonded to the first polymer chain by generating a carbanion upon the benzylic carbon atom or the allylic carbon atom and growing the second polymer chain by anionic polymerization.

An insulation precursor composition comprises ethylene propylene diene monomer, an aramid, and a bromine-containing flame retardant. Rocket motors comprising a case, an energetic material within the case, and an insulation material comprising a reaction produce of ethylene propylene diene monomer, an aramid, and a flame retardant comprising bromine are also disclosed. Related precursor compositions are also disclosed.

An insulation precursor composition comprises ethylene propylene diene monomer, an aramid, and a bromine-containing flame retardant. Rocket motors comprising a case, an energetic material within the case, and an insulation material comprising a reaction produce of ethylene propylene diene monomer, an aramid, and a flame retardant comprising bromine are also disclosed. Related precursor compositions are also disclosed.

The present disclosure provides an elastomer composition, comprising, based on the total weight 100 wt. % of the elastomer composition: 1-50 wt. % of a modified ethylene propylene copolymer; 5-60 wt. % of a first silicone resin, the first silicone resin comprising at least one selected from the group consisting of the following: a hydroxyl-terminated silicone resin and an alkoxy-terminated silicone resin; 0.1-15 wt. % of a first crosslinking agent; 0.1-15 wt. % of a catalyst; and 10-85 wt. % of a filler. The elastomer composition provided by the present disclosure at least can be co-crosslinked in low temperature (approximately −20° C. to 60° C.) conditions. An elastomer prepared from the elastomer composition provided by the present disclosure has good mechanical properties and electrical insulation properties.

The present disclosure provides an elastomer composition, comprising, based on the total weight 100 wt. % of the elastomer composition: 1-50 wt. % of a modified ethylene propylene copolymer; 5-60 wt. % of a first silicone resin, the first silicone resin comprising at least one selected from the group consisting of the following: a hydroxyl-terminated silicone resin and an alkoxy-terminated silicone resin; 0.1-15 wt. % of a first crosslinking agent; 0.1-15 wt. % of a catalyst; and 10-85 wt. % of a filler. The elastomer composition provided by the present disclosure at least can be co-crosslinked in low temperature (approximately −20° C. to 60° C.) conditions. An elastomer prepared from the elastomer composition provided by the present disclosure has good mechanical properties and electrical insulation properties.

A precursor composition comprising, before curing, ethylene propylene diene monomer (EPDM), zinc oxide, silica, polymerized 1,2-dihydro-2,2,4-trimethylquinoline, a solid chlorinated paraffin, stearic acid, a five carbon petroleum hydrocarbon, trimethylolpropane trimethacrylate, and a peroxide. A rocket motor including a reaction product of the precursor composition and a method of insulating a rocket motor.

A precursor composition comprising, before curing, ethylene propylene diene monomer (EPDM), zinc oxide, silica, polymerized 1,2-dihydro-2,2,4-trimethylquinoline, a solid chlorinated paraffin, stearic acid, a five carbon petroleum hydrocarbon, trimethylolpropane trimethacrylate, and a peroxide. A rocket motor including a reaction product of the precursor composition and a method of insulating a rocket motor.

A precursor composition comprising, before curing, ethylene propylene diene monomer (EPDM), zinc oxide, silica, polymerized 1,2-dihydro-2,2,4-trimethylquinoline, a solid chlorinated paraffin, stearic acid, a five carbon petroleum hydrocarbon, trimethylolpropane trimethacrylate, and a peroxide. A rocket motor including a reaction product of the precursor composition and a method of insulating a rocket motor.

Provided is a method of modifying a blend of polycarbonate and acrylonitrile/butadiene/styrene copolymer comprising adding composite particles to the blend, wherein the composite particles comprise (I) a partially crosslinked polyolefin core and (II) a full or partial shell comprising polymerized units of one or more vinyl monomer, and the resulting modified blend.