Photooxidative Degradation of Clear Ultraviolet Absorbing Acrylic Copolymer Surfaces

Gupta, Amitava; Liang, Ranty H.; Vogl, Otto; Pradellok, Witold; Huston, Alan L.; Scott, Gary W.

doi:10.1007/978-1-4615-7584-9_18

Physicochemical Aspects of Polymer Surfaces 1983

DOI: 10.1007/978-1-4615-7584-9_18

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Photooxidative Degradation of Clear Ultraviolet Absorbing Acrylic Copolymer Surfaces

Amitava Gupta

Ranty H. Liang

Otto Vogl³

et al.

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1984

1990

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Cited by 3 publications

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Wirkungsweise von stabilisatoren in polymeren unter berücksichtigung der 2‐hydroxyphenylbenzotriazole

Kramer

1990

Angew. Makromol. Chem.

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In the first part a survey is given on UV screeners, UV absorbers, wenchers of excited states, antioxidants and peroxide decomposers.In the second part UV absorbers,e.g. Tinuvin P (2-(2'-hydro~y-5~methylphenyl)benzotriazole, Scheme 8) are described in detail where intramolecular proton transfer occurs in the excited state (TIN(intra)). This proton transfer may be accompanied and/or followed by very fast and effective temperature dependent radiationless deactivation processes which are promoted by internal vibrations and librations of the molecule.

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Wirkungsweise von stabilisatoren in polymeren unter berücksichtigung der 2‐hydroxyphenylbenzotriazole

Kramer

1990

Angew. Makromol. Chem.

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Mechanism of photostabilization of polystyrene film by dihydroxyphenyl‐pirazoles

Sastre

Catalina

Mateo

et al. 1990

J. Polym. Sci. A Polym. Chem.

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A new family of ultraviolet absorbers, the dihydroxyphenyl‐pyrazoles, has shown to be able to act as photostabilizers of polymers. In the present work the efficiency of the derivative 2,5 bis(pyrazol‐1′‐yl)‐1,4‐dihydroxybenzene (BPHB) in preventing the photooxidative degradation of polystyrene films have been measured. The effect of light screening on polymer photostabilization was examined by using external filter solutions of BPHB and it was found that it does not function simply as a light screener. Phosphorescence quenching experiments show that BPHB behaves also as an efficient triplet‐state quencher of the polymer in‐chain carbonyl impurity groups, which play an important part in the overall mechanism of light stabilization.

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Long-term aging behavior of ultraviolet-absorbing intraocular lenses

Gupta

1984

American Intra-Ocular Implant Society Journal

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Photooxidative Degradation of Clear Ultraviolet Absorbing Acrylic Copolymer Surfaces

Cited by 3 publications

References 9 publications

Wirkungsweise von stabilisatoren in polymeren unter berücksichtigung der 2‐hydroxyphenylbenzotriazole

Wirkungsweise von stabilisatoren in polymeren unter berücksichtigung der 2‐hydroxyphenylbenzotriazole

Mechanism of photostabilization of polystyrene film by dihydroxyphenyl‐pirazoles

Long-term aging behavior of ultraviolet-absorbing intraocular lenses

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