The Effect of Flexibility on the Photodegradation of Aromatic Diisocyanate Based Polyurethanes.

Abstract

The photolytic degradation of 2, 4-TDI/aliphatic diol polyurethanes is directly dependent on the flexibility of the polymer backbone. The extent of photodegradation is accelerated above the glass transition temperature indicating the role of chain flexibility and/or oxygen diffusion in the decomposition process. Photolysis of the model compound ethyl N-phenylcarbamate (EPC) in neutral host polymer matrices indicates that the para photo-Fries to ortho photo-Fries product ratio experiences an accelerated increase with temperature above the glass transistion of the polymer matrix.

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Document Details

Document Type
Technical Report
Publication Date
Jul 29, 1987
Accession Number
ADA183443

Entities

People

  • Charles E. Hoyle
  • Kyu-jun Kim

Organizations

  • University of Southern Mississippi

Tags

DTIC Thesaurus Topics

  • Alcohols
  • Classification
  • Critical Temperature
  • Decomposition
  • Degradation
  • Diffusion
  • Films
  • Glass Transition Temperature
  • Literature Surveys
  • Materials
  • Mercury Lamps
  • Methylenes
  • Military Research
  • Mississippi
  • Polymers
  • Small Molecules
  • Transition Temperature

Fields of Study

  • Materials science

Readers

  • Organic Chemistry
  • Polymer Science and Engineering.