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Synthesis and development of low cost, high temperature n-arylene polybenzimidazole foam material
| Content Provider | NASA Technical Reports Server (NTRS) |
|---|---|
| Author | Harrison, E. S. |
| Copyright Year | 1975 |
| Description | Polymer (and foam) studies followed two basic routes: (1) formation of high molecular weight uncyclized polyamide followed by subsequent fusion and cyclodehydration to yield NABI (foam) and (2) polymer and foam formation by reaction of diphenyl esters (or anhydrides) with the tetramine. The latter route was found much more attractive since considerable versatility in both basic polymer structure and crosslinkability is achievable. Preliminary studies on BAB, phthalic anhydride (PA), and 3, 3 (prime), 4, 4(prime) benzo pheno netetracarboxylic acid dianhydride (BTDA) as crosslinked polymer precursors were conducted. Nonmelting rigid char forming foams with densities as low as 2.7 lb/cubic ft. were achieved. The program was successful in the preparation of a potentially low cost, low density, high char yield, high temperature foam material. |
| File Size | 2442624 |
| Page Count | 66 |
| File Format | |
| Alternate Webpage(s) | http://archive.org/details/NASA_NTRS_Archive_19760021332 |
| Archival Resource Key | ark:/13960/t54f6k44x |
| Language | English |
| Publisher Date | 1975-06-01 |
| Access Restriction | Open |
| Subject Keyword | Nonmetallic Materials Foams Synthetic Fibers Chemical Reactions Stoichiometry Polybenzimidazole Aromatic Compounds 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 |
