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Study on the photoprotecting behaviour of a phenylformamidine light stabilizer

1992; Elsevier BV; Volume: 37; Issue: 3 Linguagem: Inglês

10.1016/0141-3910(92)90160-7

1873-2321

Jiang-Qing Pan, Cao Cin,

Synthesis of Organic Compounds

The photoprotecting behaviour and effectiveness of three UV-stabilizers, N-(-p-ethoxy-carbonylphenyl-)-N′-ethyl-N′phenyl-formamidine(UV1),2-hydroxy-4-octoxy benzophenone (UV2) and 2-(2′hydroxy-3′,5′-ditert-butyl-phenyl)-5-chloro benzotriazole (UV3) have been studied by IR, UV and fluorescence spectroscopies. The photoprotecting effectiveness decreases in the order UV2>UV1>UV3. UV1 shows a good screening action and is a good quencher of singlet oxygen and of the fluorescence of polypropylene and of rhodamine. The photoprotecting action of UV1 may be associated with UV screening, with excited state quenching and with its ability to scavenge free radicals.