Nanomodified backbones of polyimides with bifunctional and mixed functional end-capping groups

Abstract

The present invention relates to nano-modified backbones of polyimides with bifunctional and mixed functional end capping groups. The present invention provides a polyimide comprising a backbone having at least one nanoparticle component and made of an oligomer having end-capping groups, wherein the end-capping groups may be bifunctional or bifunctional and Monofunctional mixture. The end capping group may be a nadic or phenethynyl group. The backbone can be entirely inorganic or made of a mixture of inorganic and organic groups. The oligomers can be formed in situ using standard monomer reactant polymerization chemistry using solvents, or can be provided as preimidized compounds that can be solid or liquid. It is believed that the nanoparticle component of the polymer backbone provides superior thermo-oxidative stability compared to the unmodified organic backbone. It is also believed that the provision of bifunctional or mixed bifunctional and monofunctional end capping groups increases crosslinking, thereby providing improved strength and stiffness compared to fully monofunctional capped oligomers of polyimides. Nanoparticles are part of the backbone of the polymer, not just pendant groups.

Description

technical field [0001] The implementations described herein relate primarily to polyimide oligomers with nano-modified backbones, and more particularly to polyimide oligomers with nano-modified backbones containing functional end-capping groups, containing nano-modified Resin systems of polyimide oligomers with a permanent backbone, composite materials formed therefrom, and methods of use thereof. Background technique [0002] Typically only a few thermoset resins commonly used in fiber reinforced composites today are available for high temperature applications (eg, aerospace applications). These high temperature thermosetting resins are undesirable in many applications because they generally form brittle composites with relatively low thermal stability. [0003] Recently, chemists have attempted to synthesize oligomers for high-performance, high-temperature advanced composites suitable for high-temperature applications. These composites should exhibit solvent resistance, ...

AI Technical Summary

Problems solved by technology

However, typical polyimides are susceptible to thermo-oxidative aging which reduces their long-term strength and stiffness

Furthermore, most formulations of high-temperature polymer-matrix composites have monofunctional endcaps that limit the degree of crosslinking that can be achieved

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