Photodegradation of Polyimides. 4. Mechanism for the Photooxidation Process Based on a Model Compound
Abstract
Based on analysis of the photochemistry of a model compound, N- phenylphthalimide, the photolysis of polyimide derived from 4,'-oxydianiline (ODA) and a diarylanhydride with a hexafluorinated isopropylidene bridging group (6F) is proposed to proceed via formation from a phthalic anhydride type photoproduct. The quantum yield for product formation of N-phenylphthalimide is quite low (<10 to the -3rd power) indicating a rather inefficient first step in the overall oxidative degradation process. However, based on the efficiency of the of the photooxidation of the primary photoproducts, a process leading to the ultimate failure and complete ablation of the 6F-ODA films in air upon exposure to the unfiltered output of a mercury lamp is postulated.
Document Details
- Document Type
- Technical Report
- Publication Date
- May 31, 1991
- Accession Number
- ADA236198
Entities
People
- Charles E. Hoyle
- D. Creed
- Edgardo T. Anzures
- P. Subramanian
- R. Nagarajan
Organizations
- University of Southern Mississippi