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The effect of molecular weight on the composite properties of cured phenylethynyl terminated imide oligomers
| Content Provider | NASA Technical Reports Server (NTRS) |
|---|---|
| Author | Hergenrother, P. M. Connell, J. W. Smith Jr., J. G. |
| Copyright Year | 1997 |
| Description | As part of a program to develop high temperature/high performance structural resins for aeronautical applications, imide oligomers containing terminal phenylethynyl groups with calculated number average molecular weights of 1250, 2500 and 5000 g/mol were prepared, characterized, and evaluated as adhesives and composite matrix resins. The goal of this work was to develop resin systems that are processable using conventional processing equipment into void free composites that exhibit high mechanical properties with long term high temperature durability, and are not affected by exposure to common aircraft fluids. The imide oligomers containing terminal phenylethynyl groups were fabricated into titanium adhesive specimens and IM-7 carbon fiber laminates under 0.1 - 1.4 MPa for 1 hr at 350-371 C. The lower molecular weight oligomers exhibited higher cured Tg, better processability, and better retention of mechanical properties at elevated temperature without significantly sacrificing toughness or damage tolerance than the higher molecular weight oligomer. The neat resin, adhesive and composite properties of the cured polymers will be presented. |
| File Size | 137436 |
| Page Count | 13 |
| File Format | |
| Alternate Webpage(s) | http://archive.org/details/NASA_NTRS_Archive_20040110273 |
| Archival Resource Key | ark:/13960/t6062gz9z |
| Language | English |
| Publisher Date | 1997-01-01 |
| Access Restriction | Open |
| Subject Keyword | Inorganic, Organic And Physical Chemistry Resin Transfer Molding Mechanical Properties Durability Laminates Molecular Weight Imides Thin Films Oligomers Fabrication Toughness Carbon Fibers Phenyls Composite Materials Adhesives Tensile Properties 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 | Technical Report |
