NDLI: Low toxicity high temperature pmr polyimide

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Low toxicity high temperature pmr polyimide

Content Provider	NASA Technical Reports Server (NTRS)
Copyright Year	1992
Description	In-situ polymerization of monomer reactants (PMR) type polyimides constitute an important class of ultra high performance composite matrix resins. PMR-15 is the best known and most widely used PMR polyimide. An object of the present invention is to provide a substantially improved high temperature PMR-15 system that exhibits better processability, toughness, and thermo-oxidative stability than PMR-15, as well as having a low toxicity. Another object is to provide new PMR polyimides that are useful as adhesives, moldings, and composite matrices. By the present invention, a new PMR polyimide comprises a mixture of the following compounds: 3,4'-oxydianiline (3,4'-ODA), NE, and BTDE which are then treated with heat. This PMR was designated LaRC-RP46 and has a broader processing window, better reproducibility of high quality composite parts, better elevated temperature mechanical properties, and higher retention of mechanical properties at an elevated temperature, particularly, at 371 C.
File Size	850341
Page Count	18
File Format	PDF
Alternate Webpage(s)	http://archive.org/details/NASA_NTRS_Archive_19930005520
Archival Resource Key	ark:/13960/t0kt1m785
Language	English
Publisher Date	1992-12-15
Access Restriction	Open
Subject Keyword	Nonmetallic Materials Toughness Heat Treatment Adhesives Toxicity Polyimides Polymerization Mechanical Properties Oxidation High Temperature Monomers Matrix Materials Resin Matrix Composites Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science
Content Type	Text
Resource Type	Patent

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