Development of Pyrrone Structural Foams For Honeycomb Filler.

Abstract

The development of techniques for the preparation of pyrrone structural foams for use as honeycomb filler is described. The feasibility of preparing foams from polymers formed by the condensation of 3,3'-diaminobenzidine (DAB), or 3,3' ,4,4'-tetraaminobenzophenone (TABP), with 3,3' ,4,4'-benzophenone tetracarboxylic dianhydride (BTDA) was investigated. Initially, most of the effort was devoted to preparing pyrrone prepolymers with improved and more reproducible foaming properties for making chemically blown foams. When it became apparent that very high curing shrinkages would not allow the use of unfilled pyrrone prepolymers in a 'foam-in-place' process, emphasis was shifted from chemically blown foams to syntactic foams. Syntactic foam formulations containing hollow carbon microspheres were developed. Syntactic foams made from selected formulations were found to have very low coefficients of thermal expansion. A technique was developed for the emplacement of pyrrone syntactic foam formulations in honeycomb core structures.

Open PDF

Document Details

Document Type
Technical Report
Publication Date
Mar 01, 1973
Accession Number
ADA305868

Entities

People

  • B. G. Kimmel

Organizations

  • Hughes Aircraft Company

Tags

Communities of Interest

  • Air Platforms
  • Energy and Power Technologies

DTIC Thesaurus Topics

  • Carboxylic Acids
  • Cell Structure
  • Chemical Synthesis
  • Chemistry
  • Composite Materials
  • Compressive Strength
  • Dissipation Factor
  • Honeycomb Cores
  • Honeycomb Structures
  • Materials
  • Materials Processing
  • Materials Science
  • Measurement
  • Melting Point
  • Reaction Time
  • Resins
  • Syntactic Foams

Readers

  • Polymer Science and Engineering.