TiO2-, ZnO-, and CdS-photocatalyzed oxidation of ethylene-propylene thermoplastic elastomers
The ZnO-, TiO2-, and CdS-photocatalyzed oxidations of an amorphous ethylene-propylene copolymer (EP copolymer) containing 75% w/w of ethylene are described. In solid films exposed under polychromatic (λ > 300 nm) or monochromatic (λ = 365 nm) UV light, it is observed that the introduction of pigm...
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E-Artikel |
|---|---|
| Sprache: |
Englisch |
| Erschienen: |
1987 |
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| Umfang: |
10 Ill. 14 |
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| Reproduktion: |
Wiley InterScience Backfile Collection 1832-2000 |
|---|---|
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in: Journal of Polymer Science Part A: Polymer Chemistry - Bognor Regis [u.a.] : Wiley, 25(1987) vom: Okt., Seite 2799-2812 |
| Übergeordnetes Werk: |
volume:25 ; year:1987 ; month:10 ; pages:2799-2812 ; extent:14 |
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| 520 | |a The ZnO-, TiO2-, and CdS-photocatalyzed oxidations of an amorphous ethylene-propylene copolymer (EP copolymer) containing 75% w/w of ethylene are described. In solid films exposed under polychromatic (λ > 300 nm) or monochromatic (λ = 365 nm) UV light, it is observed that the introduction of pigment (0.5-5% w/w) strongly modified the course of the photooxidation of a transparent sample. Ketonic and lactonic groups accumulate in the polymer matrix without being converted photochemically into acidic, ester, and vinyl groups. In the kinetic study it is pointed out that the variations of the rate of formation of carbonyl groups depend on the nature of the pigment. With highly photoactive pigments (ZnO and untreated TiO2 RL11A), the rate is at first a decreasing function of the pigment percent, then an increasing function. With poorly photoactive pigments (treated TiO2 RL90 and CdS), the rate of formation of carbonyl groups is a decreasing function of the pigment content. It is therefore emphasized that, at a low pigment content, the inner filter effect prevails over the photocatalytic influence with any pigment. It is also observed that the rate of formation of vinyl groups, photoproducts formed from the excited ketones, is a monotonously decreasing function of the pigment content. The complete inhibition of the ketone photochemistries is observed with ZnO in conditions in which the light is not absorbed by the pigment, suggesting that the carbonyl groups formed are adsorbed on the pigment. | ||
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(DE-627)NLEJ163978603 DE-627 ger DE-627 rakwb eng TiO2-, ZnO-, and CdS-photocatalyzed oxidation of ethylene-propylene thermoplastic elastomers 1987 10 Ill. 14 nicht spezifiziert zzz rdacontent nicht spezifiziert z rdamedia nicht spezifiziert zu rdacarrier The ZnO-, TiO2-, and CdS-photocatalyzed oxidations of an amorphous ethylene-propylene copolymer (EP copolymer) containing 75% w/w of ethylene are described. In solid films exposed under polychromatic (λ > 300 nm) or monochromatic (λ = 365 nm) UV light, it is observed that the introduction of pigment (0.5-5% w/w) strongly modified the course of the photooxidation of a transparent sample. Ketonic and lactonic groups accumulate in the polymer matrix without being converted photochemically into acidic, ester, and vinyl groups. In the kinetic study it is pointed out that the variations of the rate of formation of carbonyl groups depend on the nature of the pigment. With highly photoactive pigments (ZnO and untreated TiO2 RL11A), the rate is at first a decreasing function of the pigment percent, then an increasing function. With poorly photoactive pigments (treated TiO2 RL90 and CdS), the rate of formation of carbonyl groups is a decreasing function of the pigment content. It is therefore emphasized that, at a low pigment content, the inner filter effect prevails over the photocatalytic influence with any pigment. It is also observed that the rate of formation of vinyl groups, photoproducts formed from the excited ketones, is a monotonously decreasing function of the pigment content. The complete inhibition of the ketone photochemistries is observed with ZnO in conditions in which the light is not absorbed by the pigment, suggesting that the carbonyl groups formed are adsorbed on the pigment. Wiley InterScience Backfile Collection 1832-2000 Lacoste, Jacques oth Singh, Raj Pal oth Boussand, Jacques oth Arnaud, Rene oth in Journal of Polymer Science Part A: Polymer Chemistry Bognor Regis [u.a.] : Wiley 25(1987) vom: Okt., Seite 2799-2812 (DE-627)NLEJ159071542 (DE-600)1473076-5 0887-624X nnns volume:25 year:1987 month:10 pages:2799-2812 extent:14 http://dx.doi.org/10.1002/pola.1987.080251015 text/html Deutschlandweit zugänglich GBV_USEFLAG_U ZDB-1-WIS GBV_NL_ARTICLE AR 25 1987 10 2799-2812 14 |
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(DE-627)NLEJ163978603 DE-627 ger DE-627 rakwb eng TiO2-, ZnO-, and CdS-photocatalyzed oxidation of ethylene-propylene thermoplastic elastomers 1987 10 Ill. 14 nicht spezifiziert zzz rdacontent nicht spezifiziert z rdamedia nicht spezifiziert zu rdacarrier The ZnO-, TiO2-, and CdS-photocatalyzed oxidations of an amorphous ethylene-propylene copolymer (EP copolymer) containing 75% w/w of ethylene are described. In solid films exposed under polychromatic (λ > 300 nm) or monochromatic (λ = 365 nm) UV light, it is observed that the introduction of pigment (0.5-5% w/w) strongly modified the course of the photooxidation of a transparent sample. Ketonic and lactonic groups accumulate in the polymer matrix without being converted photochemically into acidic, ester, and vinyl groups. In the kinetic study it is pointed out that the variations of the rate of formation of carbonyl groups depend on the nature of the pigment. With highly photoactive pigments (ZnO and untreated TiO2 RL11A), the rate is at first a decreasing function of the pigment percent, then an increasing function. With poorly photoactive pigments (treated TiO2 RL90 and CdS), the rate of formation of carbonyl groups is a decreasing function of the pigment content. It is therefore emphasized that, at a low pigment content, the inner filter effect prevails over the photocatalytic influence with any pigment. It is also observed that the rate of formation of vinyl groups, photoproducts formed from the excited ketones, is a monotonously decreasing function of the pigment content. The complete inhibition of the ketone photochemistries is observed with ZnO in conditions in which the light is not absorbed by the pigment, suggesting that the carbonyl groups formed are adsorbed on the pigment. Wiley InterScience Backfile Collection 1832-2000 Lacoste, Jacques oth Singh, Raj Pal oth Boussand, Jacques oth Arnaud, Rene oth in Journal of Polymer Science Part A: Polymer Chemistry Bognor Regis [u.a.] : Wiley 25(1987) vom: Okt., Seite 2799-2812 (DE-627)NLEJ159071542 (DE-600)1473076-5 0887-624X nnns volume:25 year:1987 month:10 pages:2799-2812 extent:14 http://dx.doi.org/10.1002/pola.1987.080251015 text/html Deutschlandweit zugänglich GBV_USEFLAG_U ZDB-1-WIS GBV_NL_ARTICLE AR 25 1987 10 2799-2812 14 |
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(DE-627)NLEJ163978603 DE-627 ger DE-627 rakwb eng TiO2-, ZnO-, and CdS-photocatalyzed oxidation of ethylene-propylene thermoplastic elastomers 1987 10 Ill. 14 nicht spezifiziert zzz rdacontent nicht spezifiziert z rdamedia nicht spezifiziert zu rdacarrier The ZnO-, TiO2-, and CdS-photocatalyzed oxidations of an amorphous ethylene-propylene copolymer (EP copolymer) containing 75% w/w of ethylene are described. In solid films exposed under polychromatic (λ > 300 nm) or monochromatic (λ = 365 nm) UV light, it is observed that the introduction of pigment (0.5-5% w/w) strongly modified the course of the photooxidation of a transparent sample. Ketonic and lactonic groups accumulate in the polymer matrix without being converted photochemically into acidic, ester, and vinyl groups. In the kinetic study it is pointed out that the variations of the rate of formation of carbonyl groups depend on the nature of the pigment. With highly photoactive pigments (ZnO and untreated TiO2 RL11A), the rate is at first a decreasing function of the pigment percent, then an increasing function. With poorly photoactive pigments (treated TiO2 RL90 and CdS), the rate of formation of carbonyl groups is a decreasing function of the pigment content. It is therefore emphasized that, at a low pigment content, the inner filter effect prevails over the photocatalytic influence with any pigment. It is also observed that the rate of formation of vinyl groups, photoproducts formed from the excited ketones, is a monotonously decreasing function of the pigment content. The complete inhibition of the ketone photochemistries is observed with ZnO in conditions in which the light is not absorbed by the pigment, suggesting that the carbonyl groups formed are adsorbed on the pigment. Wiley InterScience Backfile Collection 1832-2000 Lacoste, Jacques oth Singh, Raj Pal oth Boussand, Jacques oth Arnaud, Rene oth in Journal of Polymer Science Part A: Polymer Chemistry Bognor Regis [u.a.] : Wiley 25(1987) vom: Okt., Seite 2799-2812 (DE-627)NLEJ159071542 (DE-600)1473076-5 0887-624X nnns volume:25 year:1987 month:10 pages:2799-2812 extent:14 http://dx.doi.org/10.1002/pola.1987.080251015 text/html Deutschlandweit zugänglich GBV_USEFLAG_U ZDB-1-WIS GBV_NL_ARTICLE AR 25 1987 10 2799-2812 14 |
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(DE-627)NLEJ163978603 DE-627 ger DE-627 rakwb eng TiO2-, ZnO-, and CdS-photocatalyzed oxidation of ethylene-propylene thermoplastic elastomers 1987 10 Ill. 14 nicht spezifiziert zzz rdacontent nicht spezifiziert z rdamedia nicht spezifiziert zu rdacarrier The ZnO-, TiO2-, and CdS-photocatalyzed oxidations of an amorphous ethylene-propylene copolymer (EP copolymer) containing 75% w/w of ethylene are described. In solid films exposed under polychromatic (λ > 300 nm) or monochromatic (λ = 365 nm) UV light, it is observed that the introduction of pigment (0.5-5% w/w) strongly modified the course of the photooxidation of a transparent sample. Ketonic and lactonic groups accumulate in the polymer matrix without being converted photochemically into acidic, ester, and vinyl groups. In the kinetic study it is pointed out that the variations of the rate of formation of carbonyl groups depend on the nature of the pigment. With highly photoactive pigments (ZnO and untreated TiO2 RL11A), the rate is at first a decreasing function of the pigment percent, then an increasing function. With poorly photoactive pigments (treated TiO2 RL90 and CdS), the rate of formation of carbonyl groups is a decreasing function of the pigment content. It is therefore emphasized that, at a low pigment content, the inner filter effect prevails over the photocatalytic influence with any pigment. It is also observed that the rate of formation of vinyl groups, photoproducts formed from the excited ketones, is a monotonously decreasing function of the pigment content. The complete inhibition of the ketone photochemistries is observed with ZnO in conditions in which the light is not absorbed by the pigment, suggesting that the carbonyl groups formed are adsorbed on the pigment. Wiley InterScience Backfile Collection 1832-2000 Lacoste, Jacques oth Singh, Raj Pal oth Boussand, Jacques oth Arnaud, Rene oth in Journal of Polymer Science Part A: Polymer Chemistry Bognor Regis [u.a.] : Wiley 25(1987) vom: Okt., Seite 2799-2812 (DE-627)NLEJ159071542 (DE-600)1473076-5 0887-624X nnns volume:25 year:1987 month:10 pages:2799-2812 extent:14 http://dx.doi.org/10.1002/pola.1987.080251015 text/html Deutschlandweit zugänglich GBV_USEFLAG_U ZDB-1-WIS GBV_NL_ARTICLE AR 25 1987 10 2799-2812 14 |
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(DE-627)NLEJ163978603 DE-627 ger DE-627 rakwb eng TiO2-, ZnO-, and CdS-photocatalyzed oxidation of ethylene-propylene thermoplastic elastomers 1987 10 Ill. 14 nicht spezifiziert zzz rdacontent nicht spezifiziert z rdamedia nicht spezifiziert zu rdacarrier The ZnO-, TiO2-, and CdS-photocatalyzed oxidations of an amorphous ethylene-propylene copolymer (EP copolymer) containing 75% w/w of ethylene are described. In solid films exposed under polychromatic (λ > 300 nm) or monochromatic (λ = 365 nm) UV light, it is observed that the introduction of pigment (0.5-5% w/w) strongly modified the course of the photooxidation of a transparent sample. Ketonic and lactonic groups accumulate in the polymer matrix without being converted photochemically into acidic, ester, and vinyl groups. In the kinetic study it is pointed out that the variations of the rate of formation of carbonyl groups depend on the nature of the pigment. With highly photoactive pigments (ZnO and untreated TiO2 RL11A), the rate is at first a decreasing function of the pigment percent, then an increasing function. With poorly photoactive pigments (treated TiO2 RL90 and CdS), the rate of formation of carbonyl groups is a decreasing function of the pigment content. It is therefore emphasized that, at a low pigment content, the inner filter effect prevails over the photocatalytic influence with any pigment. It is also observed that the rate of formation of vinyl groups, photoproducts formed from the excited ketones, is a monotonously decreasing function of the pigment content. The complete inhibition of the ketone photochemistries is observed with ZnO in conditions in which the light is not absorbed by the pigment, suggesting that the carbonyl groups formed are adsorbed on the pigment. Wiley InterScience Backfile Collection 1832-2000 Lacoste, Jacques oth Singh, Raj Pal oth Boussand, Jacques oth Arnaud, Rene oth in Journal of Polymer Science Part A: Polymer Chemistry Bognor Regis [u.a.] : Wiley 25(1987) vom: Okt., Seite 2799-2812 (DE-627)NLEJ159071542 (DE-600)1473076-5 0887-624X nnns volume:25 year:1987 month:10 pages:2799-2812 extent:14 http://dx.doi.org/10.1002/pola.1987.080251015 text/html Deutschlandweit zugänglich GBV_USEFLAG_U ZDB-1-WIS GBV_NL_ARTICLE AR 25 1987 10 2799-2812 14 |
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In solid films exposed under polychromatic (λ > 300 nm) or monochromatic (λ = 365 nm) UV light, it is observed that the introduction of pigment (0.5-5% w/w) strongly modified the course of the photooxidation of a transparent sample. Ketonic and lactonic groups accumulate in the polymer matrix without being converted photochemically into acidic, ester, and vinyl groups. In the kinetic study it is pointed out that the variations of the rate of formation of carbonyl groups depend on the nature of the pigment. With highly photoactive pigments (ZnO and untreated TiO2 RL11A), the rate is at first a decreasing function of the pigment percent, then an increasing function. With poorly photoactive pigments (treated TiO2 RL90 and CdS), the rate of formation of carbonyl groups is a decreasing function of the pigment content. It is therefore emphasized that, at a low pigment content, the inner filter effect prevails over the photocatalytic influence with any pigment. 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tio2-, zno-, and cds-photocatalyzed oxidation of ethylene-propylene thermoplastic elastomers |
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TiO2-, ZnO-, and CdS-photocatalyzed oxidation of ethylene-propylene thermoplastic elastomers |
| abstract |
The ZnO-, TiO2-, and CdS-photocatalyzed oxidations of an amorphous ethylene-propylene copolymer (EP copolymer) containing 75% w/w of ethylene are described. In solid films exposed under polychromatic (λ > 300 nm) or monochromatic (λ = 365 nm) UV light, it is observed that the introduction of pigment (0.5-5% w/w) strongly modified the course of the photooxidation of a transparent sample. Ketonic and lactonic groups accumulate in the polymer matrix without being converted photochemically into acidic, ester, and vinyl groups. In the kinetic study it is pointed out that the variations of the rate of formation of carbonyl groups depend on the nature of the pigment. With highly photoactive pigments (ZnO and untreated TiO2 RL11A), the rate is at first a decreasing function of the pigment percent, then an increasing function. With poorly photoactive pigments (treated TiO2 RL90 and CdS), the rate of formation of carbonyl groups is a decreasing function of the pigment content. It is therefore emphasized that, at a low pigment content, the inner filter effect prevails over the photocatalytic influence with any pigment. It is also observed that the rate of formation of vinyl groups, photoproducts formed from the excited ketones, is a monotonously decreasing function of the pigment content. The complete inhibition of the ketone photochemistries is observed with ZnO in conditions in which the light is not absorbed by the pigment, suggesting that the carbonyl groups formed are adsorbed on the pigment. |
| abstractGer |
The ZnO-, TiO2-, and CdS-photocatalyzed oxidations of an amorphous ethylene-propylene copolymer (EP copolymer) containing 75% w/w of ethylene are described. In solid films exposed under polychromatic (λ > 300 nm) or monochromatic (λ = 365 nm) UV light, it is observed that the introduction of pigment (0.5-5% w/w) strongly modified the course of the photooxidation of a transparent sample. Ketonic and lactonic groups accumulate in the polymer matrix without being converted photochemically into acidic, ester, and vinyl groups. In the kinetic study it is pointed out that the variations of the rate of formation of carbonyl groups depend on the nature of the pigment. With highly photoactive pigments (ZnO and untreated TiO2 RL11A), the rate is at first a decreasing function of the pigment percent, then an increasing function. With poorly photoactive pigments (treated TiO2 RL90 and CdS), the rate of formation of carbonyl groups is a decreasing function of the pigment content. It is therefore emphasized that, at a low pigment content, the inner filter effect prevails over the photocatalytic influence with any pigment. It is also observed that the rate of formation of vinyl groups, photoproducts formed from the excited ketones, is a monotonously decreasing function of the pigment content. The complete inhibition of the ketone photochemistries is observed with ZnO in conditions in which the light is not absorbed by the pigment, suggesting that the carbonyl groups formed are adsorbed on the pigment. |
| abstract_unstemmed |
The ZnO-, TiO2-, and CdS-photocatalyzed oxidations of an amorphous ethylene-propylene copolymer (EP copolymer) containing 75% w/w of ethylene are described. In solid films exposed under polychromatic (λ > 300 nm) or monochromatic (λ = 365 nm) UV light, it is observed that the introduction of pigment (0.5-5% w/w) strongly modified the course of the photooxidation of a transparent sample. Ketonic and lactonic groups accumulate in the polymer matrix without being converted photochemically into acidic, ester, and vinyl groups. In the kinetic study it is pointed out that the variations of the rate of formation of carbonyl groups depend on the nature of the pigment. With highly photoactive pigments (ZnO and untreated TiO2 RL11A), the rate is at first a decreasing function of the pigment percent, then an increasing function. With poorly photoactive pigments (treated TiO2 RL90 and CdS), the rate of formation of carbonyl groups is a decreasing function of the pigment content. It is therefore emphasized that, at a low pigment content, the inner filter effect prevails over the photocatalytic influence with any pigment. It is also observed that the rate of formation of vinyl groups, photoproducts formed from the excited ketones, is a monotonously decreasing function of the pigment content. The complete inhibition of the ketone photochemistries is observed with ZnO in conditions in which the light is not absorbed by the pigment, suggesting that the carbonyl groups formed are adsorbed on the pigment. |
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TiO2-, ZnO-, and CdS-photocatalyzed oxidation of ethylene-propylene thermoplastic elastomers |
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http://dx.doi.org/10.1002/pola.1987.080251015 |
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Lacoste, Jacques Singh, Raj Pal Boussand, Jacques Arnaud, Rene |
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