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BRIDGING MICROSTRUCTURE, PROPERTIES, AND PROCESSING OF POLYMER-BASED ADVANCED MATERIALS

Effect of Coated Rutile TiO2 and Disazopyrazolone Dye Additives on Unvulcanized Styrene Butadiene Rubber During Photo-Ageing

[+] Author and Article Information
Grégory Mertz

Department of Advanced Materials and Structures, CRP Henri Tudor, 66 rue de Luxembourg, L-4002 Esch-sur-Alzette, Luxembourg; Institut Jean Lamour - UMR CNRS 7198, Ecole des Mines de Nancy, Parc de Saurupt, F-54042 Nancy cedex, France

Fatima Hassouna1

Department of Advanced Materials and Structures, CRP Henri Tudor, 66 rue de Luxembourg, L-4002 Esch-sur-Alzette, Luxembourgfatima.hassouna@tudor.lu

Valérie Toniazzo, David Ruch

Department of Advanced Materials and Structures, CRP Henri Tudor, 66 rue de Luxembourg, L-4002 Esch-sur-Alzette, Luxembourg

Abdesselam Dahoun

Institut Jean Lamour - UMR CNRS 7198, Ecole des Mines de Nancy, Parc de Saurupt, F-54042 Nancy cedex, France

1

Corresponding author.

J. Eng. Mater. Technol 134(1), 010903 (Dec 12, 2011) (7 pages) doi:10.1115/1.4005418 History: Received May 27, 2011; Revised July 28, 2011; Accepted October 25, 2011; Published December 12, 2011; Online December 12, 2011

The effect of coated rutile titanium dioxide (TiO2 ) and a disazopyrazolone dye (azo dye) on the mechanism and the kinetic of photo-oxidation of unvulcanized styrene butadiene rubber (SBR) composites under accelerated UV-visible irradiation (λ > 290 nm at 35 °C) has been investigated using several techniques such as infrared spectroscopy, UV-visible spectrophotometry, and gel fraction measurements. Different photo-products resulting from the photo-ageing such as alcohol, ketone, or acids as well as cross-linked network were identified. The incorporation of TiO2 rutile and an azo dye into the matrix did not modify the mechanism of photo-oxidation. However, they have a significant effect on the kinetic of photoproducts accumulation. Both fillers protect the matrix from photo-oxidation. TiO2 rutile, thanks to its inorganic coating at the surface, dissipates part of the UV-visible radiation received by the polymer. The activity mechanism of azo dye consisting of a combination of its function as an antioxidant and light absorber, presents a better stabilizing effect compared with TiO2 rutile.

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Copyright © 2012 by American Society of Mechanical Engineers
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Figures

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Figure 1

Structure of disazopyrazolone orange dye

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Figure 2

FTIR spectra of carbonyl region of SBR (a) and SBR-TiO2 rutile deposit (b), evolution of absorbance during photo-ageing

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Figure 3

Different steps of SBR photo-oxidation [2,11-12]

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Figure 4

Kinetic of photoproducts formation at 1717 cm−1 versus irradiation time

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Figure 5

Reactions occurring at the surface of TiO2 particle in the presence of UV light and O2

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Figure 6

Raman spectra of the dye before ageing (a), dye after 120 h of ageing (b), and dye extracted from 120 h aged SBR/dye composite (c)

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Figure 7

Mechanism of action of antioxidant [34-35,40]

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Figure 8

Representation of pyrazolone radical inside the dye

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Figure 9

Proposed crosslinking mechanism of SBR [2,11-12]

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Figure 10

Evolution of crosslinked network during photo-oxidation of SBR composites

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Figure 11

Kinetic of evolution of vinyl-double band at 966 cm−1 versus irradiation time for different composites

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