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ESR study on the photosensitized decomposition of polyethylene

✍ Scribed by Takeshita, Takuo ;Tsuji, Kozo ;Seiki, Toshifumi

Book ID
104536520
Publisher
Wiley (John Wiley & Sons)
Year
1972
Tongue
English
Weight
484 KB
Volume
10
Category
Article
ISSN
0449-296X

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✦ Synopsis

Abstract

Several aromatic compounds were added to low‐density polyethylene to determine their effects on the photodegradation of polyethylene. It was shown that some aromatic compounds indeed sensitize the hydrogen abstraction of the allylic hydrogen of unsaturated groups contained in polyethylene as an improper bond. The mechanism of photosensitization was investigated by an ESR method. It was found that the higher photoexcited triplet state of an aromatic molecule produced by the biphotonic ultraviolet light absorption transfers its excess energy to the unsaturated bond to excite it, and the excited unsaturated group releases its allylic hydrogen atom, giving an allylic radical.

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