Accession Number : ADA308018

Title :   An Experimental Feasibility Study for the Preparation of Thermo-Oxidatively Stable Pyrrone Laminates.

Descriptive Note : Final rept. 2 Aug-2 Dec 68,

Corporate Author : TRW SYSTEMS GROUP REDONDO BEACH CA

Personal Author(s) : Lubowitz, H. R. ; Jones, R. J. ; Cassey, H. N. ; Vaughan, R. W. ; Burns, E. A.

PDF Url : ADA308018

Report Date : JUL 1969

Pagination or Media Count : 39

Abstract : This report describes the preparation of Pyrrone laminates, from a sulfone dianhydride, which would be suitable for long-term exposure to extreme thermal and oxidative environments. The work was divided into three principal tasks: (1) monomer synthesis, (2) polymer synthesis and characterization, and (3) laminate processing and evaluation. Pyrrone resins were prepared from bis (3, 4-dicarboxyphenoxyphenyl) sulfone dianhydride and 3, 3'-diaminobenzidine. Suitable conditions were determined for preparing laminates from completely soluble Pyrrone precursors. The laminates, which were made under relatively mild processing conditions, had medium void content and had mechanical properties similar to other state of the art condensation polymers. Laminates were subjected to long term exposure in forced air environments representing extreme end use thermo-oxidative conditions. The Pyrrone composites demonstrated resistance to the oxidative environment, but gradually succumbed under the conditions employed. The aging data were used to predict useful life durations for specimens tested. The experimental feasibility study has given results that demonstrate several interesting features of the Pyrrone films and laminates prepared from bis(3, 4-dicarboxyphenoxyphenyl) sulfone dianhydride and 3, 3'-diaminobenzidine. This resin gave neat resin and composite properties similar to or exceeding those published for state of the art Pyrrone polymer systems.

Descriptors :   *LAMINATES, THERMAL PROPERTIES, MECHANICAL PROPERTIES, EXPERIMENTAL DATA, ENVIRONMENTS, AGING(MATERIALS), EXPOSURE(GENERAL), AIR, POLYMERS, PROCESSING, SYNTHESIS(CHEMISTRY), ANHYDRIDES, VOIDS, FEASIBILITY STUDIES, OXIDATION, MONOMERS, HEAT, CONDENSATION, SULFONES.

Subject Categories : Polymer Chemistry
      Organic Chemistry
      Laminates and Composite Materials
      Thermodynamics

Distribution Statement : APPROVED FOR PUBLIC RELEASE