Fiber Reinforced PMR Polyimide Composites.
TRW EQUIPMENT GROUP CLEVELAND OH
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The major objectives of the program were to characterize commercially obtained PMR-15 polyimide prepreg on several reinforcements develop process cycles for these materials as well as PMR II polyimide prepreg prepared in-house and investigate long term composite performance on several of the above materials. The excellent performance exhibited by the PMR-15 matrix system, previously well established in the laboratory, has triggered the production of commercial materials now beginning to be used in significant quantities. For this reason, an evaluation of vendor supplied cloth and tape prepreg, as opposed to materials prepared under laboratory conditions, was timely. The PMR II matrix, a second generation PMR, utilizes the same reaction chemistry as the PMR-15 system. PMR II resins have been identified as conferring superior thermo-oxidative stability while retaining the processability of PMR-15. At this time, PMR II is not a commercially available prepreg material. PMR II monomer solutions are available on an experimental basis. Problems associated with the storage and handling of these solutions were investigated. jg p8
- Polymer Chemistry