Title

PHOTODEGRADATION OF POLYIMIDES .4. MECHANISM FOR THE PHOTOOXIDATION PROCESS BASED ON A MODEL-COMPOUND

Document Type

Article

Publication Date

1992

Department

Chemistry and Biochemistry

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

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