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Development of critical molecular weight-property specifications for high performance polymers used as adhesives and composites
| Content Provider | NASA Technical Reports Server (NTRS) |
|---|---|
| Author | Kranbuehl, D. E. |
| Copyright Year | 1982 |
| Description | The polyimide resin, LARC-160, was prepared from diethyl-3, 3', 4,4'-benzophenone tetracarboxylate, ethyl-5-norbornene-2,3-dicarboxylate and Jeffamine AP-22. The imidization reactions of NE and BTDE were studied by HPLC, C-13-NMR and IR. NE imidizes slowly at 12 C; BTDE imidizes when the resin is heated above 100 C. Both imidization reactions proceed directly to the imide. Neither amic acid is present in significant quantities at any stage of the imidization reactions. The monomer mixture was stored at 12 C for periods up to 14 months. The effects of resin aging at this temperature on the chemical composition of the resin monomer mixture and the imidized polymer formed on curing were investigated. Aging the resin monomer mixture has the effect of partially advancing the imidization reaction. The average size of the cured polymer increases slightly with resin age. |
| File Size | 1532399 |
| Page Count | 60 |
| File Format | |
| Alternate Webpage(s) | http://archive.org/details/NASA_NTRS_Archive_19820014489 |
| Archival Resource Key | ark:/13960/t0dv6c79f |
| Language | English |
| Publisher Date | 1982-02-18 |
| Access Restriction | Open |
| Subject Keyword | Nonmetallic Materials Adhesives Refractivity Curing Aging Materials Nuclear Magnetic Resonance Infrared Spectra Monomers Carbon 13 Imides Molecular Weight Polyimide Resins 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 |
