Chemical Treatment of Epoxy Resins to: 1. Reduce Moisture Sensitivity and 2. Improve the Mechanical Properties

Abstract

Epoxy resin/graphite fiber composites absorb moisture which has a deleterious effect on composite mechanical properties. The moisture results from the electrostatic attraction between residual functional groups on the epoxy resin molecules and water, blocking the functional groups with various reactants decreases the epoxy resin equilibrium moisture absorption as much as 75%. Marked isocyanates incorporated into the resin prior to curing permits in situ blocking of the functional groups, reduces moisture absorption up to 65% without affecting the elastic modulus. The resin Tg is lowered, but the stress-strain properties are generally unaffected.

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Document Details

Document Type
Technical Report
Publication Date
Sep 15, 1989
Accession Number
ADA212360

Entities

People

  • Raymond E. Fornes
  • Richard D. Gilbert

Organizations

  • North Carolina State University

Tags

Communities of Interest

  • Advanced Electronics

DTIC Thesaurus Topics

  • Absorption
  • Abstracts
  • Chemical Reactions
  • Chemistry
  • Composite Materials
  • Diffusion Coefficient
  • Epoxy Resins
  • Graphitic Materials
  • Infrared Spectroscopy
  • Isocyanates
  • Mechanical Properties
  • Modulus Of Elasticity
  • Moisture
  • Molecules
  • North Carolina
  • Residuals
  • Sorption

Fields of Study

  • Materials science

Readers

  • Polymer Science and Engineering.
  • Quantum Chemistry
  • Reinforced Composite Materials