초록 ▼

A composition of and method for making high performance imide resins that are processable by resin transfer molding (RTM) and resin infusion (RI) techniques were developed. Materials with a combination of properties, making them particularly useful for the fabrication of composite parts via RTM and/

A composition of and method for making high performance imide resins that are processable by resin transfer molding (RTM) and resin infusion (RI) techniques were developed. Materials with a combination of properties, making them particularly useful for the fabrication of composite parts via RTM and/or RI processes, were prepared, characterized and fabricated into moldings and carbon fiber reinforced composites and their mechanical properties were determined. These materials are particularly useful for the fabrication of structural composite components for aerospace applications. The method for making high performance resins for RTM and RI processes is a multi-faceted approach. It involves the preparation of a mixture of products from a combination of aromatic diamines and aromatic dianhydrides at relatively low calculated molecular weights (i.e. high stoichiometric offsets) and endcapping with latent reactive groups. The combination of these monomers results in a mixture of products, in the imide form, that exhibits a stable melt viscosity of less than approximately 60 poise below approximately 300.degree. C.

대표청구항 ▼

1. A low melt viscosity imide resin that is processable by resin transfer molding or resin infusion prepared by combining components comprising:(A) a diamine combination comprising: (i) greater than about fifty molar percent of a flexible diamine (ii) at least a second diamine (B) at least one aroma

1. A low melt viscosity imide resin that is processable by resin transfer molding or resin infusion prepared by combining components comprising:(A) a diamine combination comprising: (i) greater than about fifty molar percent of a flexible diamine (ii) at least a second diamine (B) at least one aromatic dianhydride; and (C) an endcapping agent having a phenylethynyl group wherein said components have a low stoichiometric ratio from about 0.19 to about 0.72 of dianhydride to diamine combination and wherein said imide resin has a melt viscosity of less than approximately 60 poise below approximately 300.degree. C.