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Polyimide composites based on asymmetric dianhydrides (a-odpa vs a-bpda)
| Content Provider | NASA Technical Reports Server (NTRS) |
|---|---|
| Author | Criss Jr., Jim M. Mintz, Eric A. Chuang, Kathy C. |
| Copyright Year | 2009 |
| Description | Two series of low-melt viscosity imide resins (2-15 poise at 260-280 C) were formulated from either asymmetric oxydiphthalic anhydride (a-ODPA) or asymmetric biphenyl dianhydride (a- BPDA) with 4-phenylethynyl endcap (PEPA), along with 3,4'-oxydianiline, 3,4 - methylenedianiline, 3,3 -methylenedianiline or 3,3 -diaminobenzophenone, using a solvent-free melt process. These low-melt viscosity imide resins were fabricated into polyimide/T650-35 carbon fabric composites by resin transfer molding (RTM). Composites from a-ODPA based resins display better open-hole compression strength and short beam shear strength from room temperature to 288 C than that of the corresponding a-BPDA based resins. However, due to the lower Tg s of a-ODPA based resins (265-330 C), their corresponding composites do not possess 315 C use capability while the a-BPDA based composites do. In essence, RTM 370 (T g = 370 C), derived from a-BPDA and 3,4 -ODA and PEPA, exhibits the best overall property performance at 315 C (600 F). |
| File Size | 2477566 |
| Page Count | 10 |
| File Format | |
| Alternate Webpage(s) | http://archive.org/details/NASA_NTRS_Archive_20090042957 |
| Archival Resource Key | ark:/13960/t1wd8v578 |
| Language | English |
| Publisher Date | 2009-05-18 |
| Access Restriction | Open |
| Subject Keyword | Composite Materials Anhydrides Resin Transfer Molding Rheology Photomicrographs Shear Strength Synthesis Chemistry Bismaleimide Oligomers Fabrication Asymmetry Polyimides Room Temperature Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science |
| Content Type | Text |
| Resource Type | Article |
