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Characterization of new hindered amine light stabilizers

✍ Scribed by Wayne W. Y. Lau; C. S. Lee; S. H. Goh; S. Y. Lee; Jiangqing Pan; Yu Song

Publisher
John Wiley and Sons
Year
1993
Tongue
English
Weight
368 KB
Volume
50
Category
Article
ISSN
0021-8995

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✦ Synopsis

New polymerizable urethane functional monomers containing hindered amine ( 111, 111')

and their copolymers with styrene ( S ) and methyl methacrylate (MMA) are characterized and tested as hindered amine light stabilizers ( HALS ) . Experimental results indicated that the monomers possess high photostabilizing effectiveness comparable to that of Tinuvin 770 and Tinuvin 765. Their copolymers with S and MMA showed lower photostabilizing effectiveness mainly due to the low hindered amine content in the copolymers. The copolymers, however, showed very high resistance to liquid extraction. UV and ESR analyses indicate that the photostabilizing mechanism of these HALS is through the scavenging action of nitroxyl radicals on alkyl radicals formed from degradation of the substrate polymer.

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