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- W1996297895 abstract "Polyisoprene is easily photo-oxidized both by a free-radical mechanism and by singlet oxygen (1O2). To stabilize this polymer towards both types of reactions different types of antioxidants, such as hindered phenols and hindered piperidines, are added. When both types of antioxidants are used together both antagonistic and synergistic effects can be observed. The mechanism of these reactions depends on the structure of the two anti-oxidants. In this work we have studied the effect of a mixture of 2,6-di-tert-butylphenol and 2,2,6,6-tetramethylpiperidine on the photo-oxidation of rubrene which is a well-known 1O2 quencher. Another aspect of this paper is to discuss the problem of the formation of 1O2 in a polymer matrix. Small amounts of internal and external impurities, e.g. carbonyl groups, can be responsible for the generation of 1O2 by an energy transfer mechanism in the polymer matrix. Benzophenone was used here to study the possibility of generating 1O2 by triplet excited ketone groups. It was found that benzophenone in polyisoprene solution and in polymer film may also generate 1O2 independent of the formation of ketyl radicals which are responsible for the chain scission of polyisoprene. When a hindered phenol was used as antioxidant in the presence of benzophenone, 3,5-di-tert-butylfuchsone was formed, which is also an effective sensitizer for the chain scission of polyisoprene." @default.
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- W1996297895 date "1984-06-01" @default.
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- W1996297895 title "Singlet oxygen and free-radical oxidation of polydienes and related problems with stabilization: Synergistic and antagonistic effects" @default.
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- W1996297895 doi "https://doi.org/10.1016/0047-2670(84)87051-3" @default.
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