Accession Number:

ADA183443

Title:

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

Descriptive Note:

Technical rept.,

Corporate Author:

UNIVERSITY OF SOUTHERN MISSISSIPPI HATTIESBURG DEPT OF POLYMER SCIENCE

Personal Author(s):

• Hoyle,Charles E.
• Kim,Kyu-Jun

Report Date:

1987-07-29

Pagination or Media Count:

30.0

Abstract:

The photolytic degradation of 2, 4-TDIaliphatic 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 andor 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.

Descriptors:

• *AROMATIC COMPOUNDS
• *ISOCYANATES
• *POLYURETHANE RESINS
• *POLYMERS
• GLASS
• TRANSITION TEMPERATURE
• PHOTODEGRADATION
• CHAINS
• DECOMPOSITION
• DIFFUSION
• OXYGEN
• PHOTOLYSIS
• MATRIX MATERIALS

Subject Categories:

• Polymer Chemistry

Distribution Statement:

APPROVED FOR PUBLIC RELEASE