The present disclosure discloses a low-water-vapor-permeability polyolefin-elastomer film and its preparation method. The film comprises: 50-100 mass parts of a matrix resin, 0-40 mass parts of a modified resin, 0.001-2 mass parts of an activator, 0.1-3 mass parts of an organic peroxide, 0.02-5 mass parts of an assistant cross-linker, 0.02-2 mass parts of a silane coupling agent, 0.005-2 mass parts of a light stabilizer, and 0-20 mass parts of a water blocking filler. In the present disclosure, by adding the modified resin and the activator that have an active group, a cross-linking degree and a cross-linking density of the film are improved, and a water-vapor permeability is reduced; by adding the water blocking filler, the water blocking property of the film is further improved, thereby ensuring reliability of the assembly, and prolonging service life of the assembly.

Electrolytes and polymers for a lithium battery can include a fluorinated aryl sulfonimide salt or fluorinated aryl sulfonimide polymer.

Electrolytes and polymers for a lithium battery can include a fluorinated aryl sulfonimide salt or fluorinated aryl sulfonimide polymer.

A shaped article is formed from a cured rubber composition comprising EPDM and a diene rubber. The shaped article exhibits a coefficient of friction greater than 0.1.

A method for making a vulcanizable rubber composition comprises heating while mixing a first composition comprising EPDM elastomer and alkylphenol disulfide polymer to make a first pass intermediate. The first pass intermediate is combined with a second composition comprising a sulfur crosslinkable natural or synthetic rubber to make a second pass intermediate. The second pass intermediate is combined with a curing package by mixing at a temperature below a curing temperature to make the vulcanizable rubber composition.

A method for making a vulcanizable rubber composition comprises heating while mixing a first composition comprising EPDM elastomer and alkylphenol disulfide polymer to make a first pass intermediate. The first pass intermediate is combined with a second composition comprising a sulfur crosslinkable natural or synthetic rubber to make a second pass intermediate. The second pass intermediate is combined with a curing package by mixing at a temperature below a curing temperature to make the vulcanizable rubber composition.

In an embodiment, a thermoplastic vulcanizate (TPV) composition is provided. The TPV composition includes a thermoplastic polyolefin; and an ethylene based copolymer rubber, wherein the ethylene based copolymer rubber has: a Mw of from 500,000 g/mol to 3,000,000 g/mol, a Mw/Mn of 4.0 or lower, and a g.sub.vis of 0.90 or greater. In another embodiment, a TPV composition includes a thermoplastic phase and an ethylene-propylene-diene terpolymer, wherein the thermoplastic vulcanizate composition has: a hardness of from 20 Shore A to 60 Shore D; and a stress relaxation slope of 1 to 5 (l/min) as measured by an Elastocon stress relaxation instrument.

In an embodiment, a thermoplastic vulcanizate (TPV) composition is provided. The TPV composition includes a thermoplastic polyolefin; and an ethylene based copolymer rubber, wherein the ethylene based copolymer rubber has: a Mw of from 500,000 g/mol to 3,000,000 g/mol, a Mw/Mn of 4.0 or lower, and a g.sub.vis of 0.90 or greater. In another embodiment, a TPV composition includes a thermoplastic phase and an ethylene-propylene-diene terpolymer, wherein the thermoplastic vulcanizate composition has: a hardness of from 20 Shore A to 60 Shore D; and a stress relaxation slope of 1 to 5 (l/min) as measured by an Elastocon stress relaxation instrument.

A rubber composition is provided which exhibits a high level of flex fatigue resistance, ozone resistance, building tack, bondability to diene based rubbers, and low temperature resistance. The rubber composition contains EPDM rubber, natural rubber, high cis-1,4-polybutadiene rubber, and from 5 phr to 30 phr of a butyl ionomer.

A rubber composition is provided which exhibits a high level of flex fatigue resistance, ozone resistance, building tack, bondability to diene based rubbers, and low temperature resistance. The rubber composition contains EPDM rubber, natural rubber, high cis-1,4-polybutadiene rubber, and from 5 phr to 30 phr of a butyl ionomer.