Photooxidation of an MDI (Methylene 4,4'-Diphenyl Diisocyanate) Based Polyurethane Elastomer.

Abstract

The photolysis of a polyurethane elastomer based on methylene 4,4'- diphenyl diisocyanate (MDI) in air and under vacuum results in the oxidation of primary photoproducts at relatively short irradiation times. The degree of crosslinked gel and the ultraviolet absorption spectra are both dependent on the presence of oxygen during the photolysis. Apparently, photolysis of the primary photoproducts (probably photo-Fries type) contributes to the degree of crosslinking generated upon photolysis. These results point out the complicated nature of one of the many reaction processes leading to the ultimate photogradation of MDI based polyurethanes.

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Document Details

Document Type
Technical Report
Publication Date
Jul 29, 1987
Accession Number
ADA183322

Entities

People

  • Charles E. Hoyle
  • G. L. Nelson
  • Y. G. No

Organizations

  • University of Southern Mississippi

Tags

Communities of Interest

  • Materials and Manufacturing Processes

DTIC Thesaurus Topics

  • Absorption
  • Absorption Spectra
  • Chemical Reactions
  • Chemistry
  • Classification
  • Composite Materials
  • Material Degradation Processes
  • Methylenes
  • Mississippi
  • New England
  • Photochemistry
  • Physical Properties
  • Polymeric Films
  • Polymers
  • Polyurethanes
  • United States
  • Universities

Readers

  • Organic Chemistry
  • Polymer Science and Engineering.