High performance compositions and composites

A composition comprising:

• from 50% (w/w of the total composition) to 60% (w/w of the total composition) polysiloxane consisting essentially of polyphenylmethylsiloxane and α,ω-methoxy-terminated polydimethylsiloxane;
• wherein the polyphenylmethylsiloxane comprises a mixture compound having formula (CH3SiO1.5)x(C6H5SiO1.5)y, wherein each x and y are greater than 1, and
• wherein x and y are each between 5 and 25;
• and wherein the α,ω-methoxy-terminated polydimethylsiloxane has the formula
• from 40% (w/w of the total composition) to 50% (w/w of the total composition) isopropanol;
• from 2% (w/w of the total composition) to 4% (w/w of the total composition) polydimethylsilazane comprising the formula (CH3)3Si—NH—[(CH3)2Si—NH]n—Si(CH3)3, wherein n greater than 1;
• from 0.1% (w/w of the total composition) to 2% (w/w of the total composition) of an enhancer selected from butyltitanate and aminoethylaminopropyltrimethoxysilane (H2NC2H4NHC3H6—Si(OCH3)3);
• and
• polydimethylsilane having the formula
• wherein n is greater than 1;
• which composition, after curing, is a flame resistant binder for forming a composition-fiber composite that withstands repeated temperatures over 1800° F.

A composite, comprising:

• a composition-fiber mixture comprising fibers and a composition, the composition comprising from 50% (w/w of the total composition) to 60% (w/w of the total composition) polysiloxane consisting essentially of polyphenylmethylsiloxane and α,ω-methoxy-terminated polydimethylsiloxane;
• from 40% (w/w of the total composition) to 50% (w/w of the total composition) organic solvent;
• from 2% (w/w of the total composition) to 4% (w/w of the total composition) polysilazane;
• and
• polysilane of a formula (R1R2Si)n, wherein n is greater than 1, and wherein R1 and R2 are the same or different and are alkyl, alkenyl, cycloalkyl, alkylamino, aryl, aralkyl, or alkylsilyl;
• wherein the composition-fiber mixture is cured under vacuum at a temperature of 200° F. to 450° F. for 30 minutes to 180 minutes to form the composite, which is flame resistant and withstands repeated temperatures over 1800° F.

A method for forming a composite, comprising:

• providing a composition comprising from 50% (w/w of the total composition) to 60% (w/w of the total composition) polysiloxane consisting essentially of polyphenylmethylsiloxane and α,ω-methoxy-terminated polydimethylsiloxane;
• from 40% (w/w of the total composition) to 50% (w/w of the total composition) organic solvent;
• from 2% (w/w of the total composition) to 4% (w/w of the total composition) polysilazane;
• and
• polysilane of a formula (R1R2Si)n, wherein n is greater than 1, and wherein R1 and R2 are the same or different and are alkyl, alkenyl, cycloalkyl, alkylamino, aryl, aralkyl, or alkylsilyl;
• mixing the composition with fibers in a ratio of 35:65 to 45:55 (w/w);
• and
• curing the composition-fiber mixture under vacuum at a temperature of 200° F. to 450° F. for 30 minutes to 180 minutes to form a composite, which is a flame resistant and withstands repeated temperatures over 1800° F.