Role of Ultraviolet Absorbers (UVA) and Hindered Amine Light Stabilizers (HALS) in ABS Stabilization

Abstract:

The present work evaluates the combination effect of hindered amine light stabilizers (HALS) and ultraviolet absorbers (UVA) on the ultraviolet (UV) stability of acrylonitrile-butadiene-styrene (ABS). Thus, two types of light stabilizers, Tinuvin P and Chimassorb 119 FL, were used to improve the ABS endurance against UV. Stabilized ABS samples were submitted to accelerated weathering in a Xenontest 150 S chamber, according to standard methods, in order to predict copolymer lifetime within a commercially acceptable time period. Infrared spectroscopy with attenuated total reflectance accessory (FTIR-ATR) was used to follow chemical modifications that occur on the material surface as a consequence of degradation process. While non-stabilized ABS samples loose the butadiene component in the first 22 h of exposure, in stabilized samples submitted to same accelerated conditions this component only disappears after 150 h of exposure. Non-stabilized and stabilized ABS samples present a similar yellowing behavior, a gradually increase with exposure time. Nevertheless, as expected, color modifications are less pronounced for stabilized ABS samples. The results obtained suggest that a better performance was achieved for stabilized ABS samples with Tinuvin P and Chimassorb 119 FL, which is very important to extend the copolymer lifetime.

• Periodical: Materials Science Forum (Volumes 636-637)
• Pages: 772-778
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.636-637.772
• Online since: January 2010
• Authors: Raquel Santos, Gabriela Botelho, Ana Vera Machado
• Keywords: ABS, Chemical Modification, Light Stabilizer, Yellowing

References

[1] J.F. Rabek. Polymer Photodegradation - Mechanisms and experimental methods, Chapman & Hall (1995).

[2] D.M. Kulich, J.E. Pace, L.W. Fritch Jr, A. Brisimitzakis, in: Kroschlowitz J, editor. 4 th ed. Kirk-Othmer Encyclopedia of Chemical Technology, vol. 1, New York: Wiley (1991).

DOI: 10.1002/0471238961.01021911211209.a01

[3] S. Schlick, H. Lucarini, G.F. Pedulli, M.V. Motyakin, Progress in Polymer Science, 28: 331 (2003).

[4] R. M. Santos, G. L. Botelho, A. V. Machado, submitted to Journal of Applied Polymer Science (2009).

[5] X. Jouan, J.L. Gardette, Polymer Degradation and Stability, 36: 91 (1992).

[6] M. Piton, A. Rivaton, Polymer Degradation and Stability, 55: 147 (1997).

[7] X. Jouan, J.L. Gardette, Journal of Polymer Science A, 29: 685 (1991).

[8] J.L. Gardette, B. Mailhot, Lemaire, Polymer Degradation and Stability, 48: 457 (1995).

[9] H. Muller, Polymer Degradation and Stability, Am. Chem. Soc. Symp. Ser., 55: 280 (1984).

[10] H. Zweifel. Stabilization of Polymeric Materials, Springer (1997).

[11] H. Jia, H. Wang, W. Chen, Radiation Physics and Chemistry 76: 1179 (2007).

[12] P. Gijsman. Polymer, 43: 1573 (2002).

[13] E.G. Kolawole, J.B. Adeniyi, European Polymer Journal, 18 : 469 (1982).

[14] S. Schlick, J.G. Bokria, Polymer, 43 : 3239 (2002).

[15] H. Loelinger, B. Gilg, Macromecular Materials and Engineering 137 : 163 (2003).

[16] ISO 4892-2. Plastics - Methods of Exposure to Laboratory Light Sources (1994).

[17] G. Schwedt. The essential Guide to Analytical Chemistry, John Wiley & Sons (1997).

[18] P. Gijsman. The Long-Term Stability of Polyolefins. PhD Thesis. Eindhoven University (1994).