Nonpolar polymers comprising antiplasticizers

A cured composition comprising:

• a nonpolar polymer comprising the reaction product of (a) a polyene having at least two hydrosilation reactive carbon-carbon double bonds;
• and (b) a silicon compound, having at least two hydrosilation reactive .ident.SiH groups, said silicon compound comprising at least one member selected from the group consisting of cyclic polysiloxanes, tetrahedral siloxysilanes and linear polysiloxanes;
• wherein at least one member selected from the group consisting of the polyene and the silicon compound has more than two hydrosilation reactive sites and having a glass transition temperature of at least about 20.degree. C.;
• a hydrosilation catalyst;
• and
• an antiplasticizer in an amount effective to substantially increase the modulus of the polymer, wherein said antiplasticizer comprises at least one member selected from the group consisting of o-terphenyl, m-terphenyl, fluorene, fluoranthene, hexaphenylcyclotrisiloxane, 2-vinyl naphthalene, 9-vinyl anthracene, 4,4'-difluorobenzophenone, acenaphthylene, 9-vinyl carbazole, 4-vinyl biphenyl, and triphenylvinylsilane, and said antiplasticizer is present in said cured composition in an amount of from about 1 to 30 weight percent, based on the total weight of said polyene and said silicon compound.

A curable composition, comprising:

• a reactive component curable to form a polymer comprising (a) a polyene having at least two hydrosilation reactive carbon-carbon double bonds;
• and (b) a silicon compound, having at least two hydrosilation reactive .ident.SiH groups, said silicon compound comprising at least one member selected from the group consisting of cyclic polysiloxanes, tetrahedral siloxysilanes, and linear polysiloxanes;
• wherein at least one member selected from the group consisting of the polyene and the silicon compound has more than two hydrosilation reactive sites and having a glass transition temperature of at least about 20.degree. C.;
• a hydrosilation catalyst;
• and
• an antiplasticizer in an amount effective to substantially increase the modulus of the polymer and increase the T.sub.g of the polymer, wherein said antiplasticizer comprises at least one member selected from the group consisting of o-terphenyl, m-terphenyl, fluorene, fluoranthene, hexaphenylcyclotrisiloxane, 2-vinyl naphthalene, 9-vinyl anthracene 4,4'-difluorobenzophenone, acenaphthylene, 9-vinyl carbazole, 4-vinyl biphenyl, and triphenylvinylsilane, and said antiplasticizer is present in said curable composition in an amount of from about 1 to 30 weight percent, based on the weight of said reactive component.

A composite material comprising a matrix impregnated with a curable composition, said curable composition comprising:

• a reactive component curable to form a nonpolar polymer comprising (a) a polyene having at least two hydrosilation reactive carbon-carbon double bonds;
• and (b) a silicon compound, having at least two hydrosilation reactive .ident.SiH groups, said silicon compound comprising at least one member selected from the group consisting of cyclic polysiloxanes, tetrahedral siloxysilanes, and linear polysiloxanes;
• wherein at least one member selected from the group consisting of the polyene and the silicon compound has more than two hydrosilation reactive sites and having a glass transition temperature of at least 20.degree. C.;
• a hydrosilation catalyst;
• and
• an antiplasticizer in an amount effective to substantially increase the modulus of the polymer, wherein said antiplasticizer comprises at least one member selected from the group consisting of o-terphenyl, m-terphenyl, fluorene, fluoranthene, hexaphenylcyclotrisiloxane, 2-vinyl naphthalene, 9-vinyl anthracene, 4,4'-difluorobenzophenone, acenaphthylene, 9-vinyl carbazole, 4-vinyl biphenyl, and triphenylvinylsilane, and said antiplasticizer is present in said curable composition in an amount of from about 1 to 30 weight percent, based on the weight of said reactive component.