Abstract
The durability of acrylic copolymer systems containing silica as a matting agent is investigated, with particular emphasis on the photodegradation process. The effects of the photodegradation process on the films are monitored chemically via reflectance FTIR spectroscopy and UV spectrophotometry and monitored physically via gloss levels, optical properties, film thickness, and film smoothness measurements of the cured film. The findings of this study show that as a result of photooxidation high levels of hydroperoxides are observed. In addition the FTIR results, which are discussed from a mechanistic point of view, indicate that functional group formations and crosslinking reactions which occur as a consequence of photodegradation, play a primary role. Therefore, this study suggests that silica can reduce the durability of acrylic based formulations and that the extent of this photodegradation appears to be dependent on silica type.
This is a preview of subscription content, log in via an institution to check access.
Similar content being viewed by others
References
Allen, N.S. (Ed.),Degradation and Stabilization of Polyolefins, Applied Science Publishers, London, 1983.
Rabek, J.F.,Polymer Degradation, Mechanisms and Experimental Methods, Chapman & Hall, London, 1995.
Scott, G. (Ed.), inMechanisms of Polymers Degradation and Stabilization, Elsevier Applied Science, 1990.
Fox, R.B., “Photolytic Degradation of Poly (methyl Methacrylate),”J. Polymer Sci. (Part A), 1, 1079 (1963).
Shultz, A.R., “Degradation of Polymethyl Methacrylate by Ultraviolet Lights,”J. Phys. Chem., 65, 967 (1961).
Allison, J.P., “Photodegradation of Poly (methyl Methacrylate),J. Polymer Sci. (Part A1), 4, 1209 (1966).
Allen, N.S. and McKellar, J.F.,Photochemistry of Manmade Polymers, Applied Science Publishers, London, 1989.
McNeil, I.C.,Comprehensive Polymer Science, Vol. 6, Polymer Reactions, Allen, G. (Ed.), Pergamon Press, London, 1989.
Monahan, A.R., “Photolysis of Poly (tert-butyl Acrylate) in the Region of the Glass Transition Temperature,”J. Polymer Sci. (Part A), 4, 2381 (1966).
Dickinson, H.R. et al., “Photodegradation of Poly (n-Butyl Acrylate),”Polymer Rep., 23, 217 (1982).
Allen, N.S. et al., “The Durability of Waterborne Acrylic Coatings,”Polymer Deg. Stab., 47, 117 (1995).
Scheirs, J. et al., “A Review of the Methods for Detecting and Characterizing Hydroperoxide Groups in Oxidized Polyolefins,”Polymer-plas. Technol. Eng., 34, No. 1, 97 (1995).
Gugumus, F., “Re-examination of the Role of Hydroperoxides in Polyethylene and Polypropylene,”Polymer Deg. Stab., 49, 29 (1995).
Teissedre, G., et al., “Photoageing of Polyolefins II,”Polymer Deg. Stab., 51, No. 2, 143 (1996).
Carlsson, D.J. and Wiles, D.M., “The Photodegradation of Polyethylene Films. III,”Macromolecules, 2, No. 6, 597 (1969).
Allen, N.S. and Edge, M.,Fundamentals of Polymer Degradation and Stabilization, Elsevier, England, 1992.
Gerlock, J.L., et al., “Photooxidation Kinetics in Crosslinked Polymer Coatings,”Polymer Deg. Stab., 38, 57 (1992).
Clouet, G., “Thermal Degradation of Phosphonated Poly (Methyl Methacrylate),”Polymer Deg. Stab., 17, 151 (1987).
Grassie, N.J., “Thermal Degradation of Poly(alkyl Acrylates),”Polymer Sci. A1., 9, 931 (1971).
Grassie, N. and Jenkins, R.H., “Photothermal Degradation of Copolymers of Methyl Methacrylate and n-Butyl Acrylate,”Europ. Polymer J., 9, 697 (1973).
Grassie, N., et al., “Thermal Degradation of Bromine Containing Polymers-Part A,”Polymer Deg. Stab., 3, 453 (1981).
Author information
Authors and Affiliations
Additional information
Chester Street, Manchester, M1 5DG, United Kingdom.
Rights and permissions
About this article
Cite this article
Morrow, A.M., Allen, N.S. & Edge, M. Photodegradation of water-based acrylic coatings containing silica. Journal of Coatings Technology 70, 65–72 (1998). https://doi.org/10.1007/BF02697839
Issue Date:
DOI: https://doi.org/10.1007/BF02697839