Accession Number : ADA309296

Title :   Preparation and Characterization of the Pyrrones as Thermal Structural Materials.

Descriptive Note : Contract rept.,

Corporate Author : HUGHES AIRCRAFT CO CULVER CITY CA

Personal Author(s) : Kimmel, B. G. ; Karre, L. E.

PDF Url : ADA309296

Report Date : SEP 1971

Pagination or Media Count : 96

Abstract : High strength blown and syntactic foams have been made from polyimidazophyrrolones (Pyrrone) with densities ranging from 20 to 60 pounds per cubic foot. The monomers used in the polymer synthesis were 3.3'-Diaminobenzidine and 3,3',4,4'-benzophenone tetracarboxylic dianhydride that was esterified with either ethyl alcohol or ethylene glycol. By controlling the degree of esterification of the dianhydride. A prepolymer product is obtained having the proper melt flow characteristics and controlled volative generation necessary for the production of uniform foams. This prepolymer is mixed with glass microballoons or a chemical blowing agent and cured in a closed mold to form the desired foamed products. The procedures for resin synthesis and foam production are described and the physical, mechanical, and thermal properties of the pyrrone foams are detailed.

Descriptors :   *THERMAL PROPERTIES, *SYNTACTIC FOAMS, PRODUCTION, STRUCTURAL PROPERTIES, POLYMERS, SYNTHESIS(CHEMISTRY), MELTS, HIGH STRENGTH, CHEMICAL REACTIONS, ORGANIC COMPOUNDS, MONOMERS, FLOW, ESTERS, ETHYL RADICALS, ALCOHOLS, FOAM, ETHYLENE GLYCOL, MOLDS(FORMS), BENZOPHENONES.

Subject Categories : Organic Chemistry
      Polymer Chemistry
      Plastics
      Atomic and Molecular Physics and Spectroscopy
      Thermodynamics

Distribution Statement : APPROVED FOR PUBLIC RELEASE