Abstract
A new cyclic, hindered amine light stabilizer (HALS) was prepared by the addition polymerization of a diepoxide and 4-amino-2,2,6,6-tetramethylpiperidine, and its photostabilizing effects on styrenic polymers were examined. The chemical structure of cyclic HALS was characterized by MALDI-TOF mass spectrometry. The prepared cyclic HALS had a moderate molecular weight (\( \overline M _w \) = 900∼1,100) and high thermal stability (T d ≈ 300 °C) that were compatible with styrenic polymers, such as polystyrene and styrene-butadiene rubber. The photostabilization effect of cyclic HALS was similar to or better than that of Tinuvin 770, a commercially available polymeric HALS. A synergistic effect between cyclic HALS and a UV absorber on the inhibition of photo-oxidation was observed.
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Chae, K.H., Kim, J.H. Synthesis of cyclic diepoxide — HALS addition polymers and their photostabilizing effects on styrenic polymers. Macromol. Res. 18, 170–176 (2010). https://doi.org/10.1007/s13233-009-0157-1
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DOI: https://doi.org/10.1007/s13233-009-0157-1