Water-entrained-polyimide chemical compositions for use in high-performance composite fabrication

摘要

Water-entrained compositions comprising colloidal or suspensoidal solutions comprising polyimide pre-polymers/oligomers are described. These compositions are obtained in water by initial dispersion of the resin constituents in water to from colloids or suspensoids. The water-entrained polyimide compositions can be applied to numerous surfaces or more beneficially used for composite fabrication. The coated surfaces or polyimide-pre-polymer impregnated reinforcing materials are subsequently cured and are ideal for providing thermal protection.

主权项

1. A method of forming a pre-polymer-impregnated preform, comprising:
(i) impregnating reinforcing materials with an aqueous-based composition to form a pre-impregnated preform, said aqueous-based composition comprising (a) polyamide acids or (b) monomeric reactants including at least one polyamine, at least one polyanhydride, and at least one endcap monomer; and (ii) drying the pre-impregnated preform to remove excess water; (iii) heating the pre-impregnated preform, subsequent to step (ii), to form a pre-polymer-impregnated preform comprising polyimide pre-polymers impregnated therein.