Accession Number : ADA302053

Title :   Polyarylacetylene-Matrix Composites for Solid Rocket Motor Components.

Descriptive Note : Technical rept.,

Corporate Author : AEROSPACE CORP EL SEGUNDO CA TECHNOLOGY OPERATIONS

Personal Author(s) : Katzman, H. A. ; Mallon, J. J. ; Barry, W. T.

PDF Url : ADA302053

Report Date : 01 SEP 1995

Pagination or Media Count : 11

Abstract : The fabrication process for an ablative material for solid rocket motor applications, carbon-fabric-reinforced polyarylacetylene (PAA) resin composite, is detailed. Data concerning the physical, mechanical, and ablative performance of this material are presented. PAA is a highly cross-linked aromatic polymer that contains only carbon and hydrogen. Its principal advantage is its high char yield (approx. 90 percent). For the resin synthesis, a controllable, low-temperature technique that produces a soluble, easy-to-process prepolymer was developed. Polymer chain modifications incorporated during prepolymer synthesis to improve ductility and toughness of the resin were demonstrated. Utilizing these modifications, T300/PAA composites with high char yield and good mechanical properties were fabricated using standard prepregging techniques. Comparative ablation tests of T300/PAA and the standard phenolic ablative insulator material (FM 5055) were performed with a CO2 plasma jet at NASA Marshall Space Flight Center. The results indicate that T300/PAA undergoes less weight loss and erosion than FM 5055. Also, whereas many of the FM 5055 samples exhibited unstable ablation resulting in pocketing, there was no pocketing in any of the T300/PAA samples. jg p.3

Descriptors :   *POLYMERS, *COMPOSITE MATERIALS, *MATRIX MATERIALS, *SOLID PROPELLANT ROCKET ENGINES, *ABLATIVE MATERIALS, *ROCKET COMPONENTS, REPRINTS, LOW TEMPERATURE, MECHANICAL PROPERTIES, HIGH RATE, SYNTHESIS, MODIFICATION, FABRICATION, TOUGHNESS, CARBON, HYDROGEN, EROSION, CROSSLINKING(CHEMISTRY), CHAINS, ARYL RADICALS, ACETYLENE, AROMATIC COMPOUNDS, DUCTILITY, ROCKET ENGINES, WEIGHT REDUCTION, CHARRING.

Subject Categories : Polymer Chemistry
      Laminates and Composite Materials
      Solid Propellant Rocket Engines

Distribution Statement : APPROVED FOR PUBLIC RELEASE