Photodegradation of Polyimides .4. Mechanism for the Photooxidation Process Based on a Model-Compound
Document Type
Article
Publication Date
1992
School
Polymer Science and Engineering
Abstract
Based on analysis of the photochemistry of a model compound, N-phenylphthalimide, the photolysis of a polyimide derived from 4,4′-oxydianiline (ODA) and a diarylanhydride with a hexafluorinated isopropylidine bridging group (6F) is proposed to proceed via formation of a phthalic anhydride type photoproduct. The quantum yield for product formation of N-phenylphthalimide is quite low (<10−3) indicating a rather inefficient first step in the overall oxidative degradation process. However, based on the efficiency of the photo-oxidation 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.
Publication Title
Polymer
Volume
33
Issue
15
First Page
3162
Last Page
3168
Recommended Citation
Hoyle, C. E.,
Creed, D.,
Nagarajan, R.,
Subramanian, P.,
Anzures, E.
(1992). Photodegradation of Polyimides .4. Mechanism for the Photooxidation Process Based on a Model-Compound. Polymer, 33(15), 3162-3168.
Available at: https://aquila.usm.edu/fac_pubs/6823