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Curing and Photostabilization of Thermoset and Photoset Acrylate Polymers
Author(s) -
Decker Christian,
Zahouily Khalid,
Valet Andreas
Publication year - 2001
Publication title -
macromolecular materials and engineering
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.913
H-Index - 96
eISSN - 1439-2054
pISSN - 1438-7492
DOI - 10.1002/1439-2054(20010101)286:1<5::aid-mame5>3.0.co;2-e
Subject(s) - thermosetting polymer , acrylate , materials science , curing (chemistry) , polyurethane , polymer , melamine , melamine resin , polymer chemistry , stabilizer (aeronautics) , coating , composite material , copolymer , mechanical engineering , engineering
The light‐stability of thermosetting acrylate and UV‐cured acrylate polymers has been tested in an accelerated QUV weatherometer. Infrared spectroscopy was used to monitor in situ the chemical changes occurring upon both curing and photoageing of 35 μm thick clearcoats. The curing was shown to proceed more extensively in photoset than in thermoset acrylate polymers which contain 6 and 20% unreacted functional groups, respectively. During photoageing, the loss of the binder structural groups is accompanied by the production of oxidation products (carbonyl and hydroxyl groups). The UV‐cured polyurethane‐acrylate coating was shown to be more resistant to accelerated weathering than the melamine/acrylate thermoset currently used as automotive finishes. The addition of a hydroxyphenyltriazine UV‐absorber and a hindered amine light stabilizer (HALS) radical scavenger was found to increase substantially the light stability of acrylate clearcoats.