Accession Number : ADA308538

Title :   Development and Processing of Pyrrone Polymers.

Descriptive Note : Contract rept.,

Corporate Author : HUGHES AIRCRAFT CO CULVER CITY CA

Personal Author(s) : Karre, L. E. ; Keller, L. B. ; Miller, L. J.

PDF Url : ADA308538

Report Date : MAY 1969

Pagination or Media Count : 105

Abstract : This report describes the development and processing of Pyrrone polymers. The work was divided into three consecutive phases based upon the type of dianhydride used and the solvent media in which the reactions were conducted. In Phase I, the synthesized polymer gave disappointing strength properties which were attributed to the poor flow characteristics inherent in the polymer-solvent system. In Phase II, primary efforts included the synthesis, characterization, and subsequent fabrication of the polymer formed from the condensation of benzophenone tetracarboxylic dianhydride (BTDA) with diaminobenzidine (DAB) in the esterifying solvent ethylene glycol (EG). Fiberglass laminates formed with the Phase II polymer had room temperature flexural strengths above 70,000 psi and moduli on the order of 5 x 10 to the 6th power psi. Phase III of the program was initiated to investigate methods for improving the oxidative stability of the BTDA-DAB resin system. The most promising resin system of the three investigated, from the standpoint of both mechanical strength and thermal stability, is the polymer formed from BTDA and DAB in ethanol.

Descriptors :   *POLYMERS, *ANHYDRIDES, *AMINES, *ETHYLENE GLYCOL, FIBERGLASS, SYNTHESIS, LAMINATES, FABRICATION, THERMAL STABILITY, STRENGTH(MECHANICS), ROOM TEMPERATURE, OXIDATION, FLEXURAL STRENGTH, SOLVENTS, MEDIA, AROMATIC COMPOUNDS, FLOW, CONDENSATION.

Subject Categories : Polymer Chemistry
      Organic Chemistry
      Laminates and Composite Materials

Distribution Statement : APPROVED FOR PUBLIC RELEASE