Effect of photostabilizers on the rate of photodegradation of polymethylmethacrylate |
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| Authors: | V.Ya. Shlyapintokh,V.I. Gol&#x Denberg |
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| Affiliation: | Institute of Chemical Physics, Academy of Sciences of the U.S.S.R., Vorob''evskoe Shosse, 2b, Moscow, U.S.S.R. |
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| Abstract: | Study of the action of photostabilizers on the rate of macromolecule scission for PMMA films irradiated with 2537 nm light in air or in inert gas demonstrated that the effectiveness of photostabilizers is determined solely by their absorbing capacity. Photoconversion of PMMA is accelerated by addition of monomer or of some antioxidants. Simultaneous acceleration of the accumulation of free radicals, photodegradation and scission of CH2 groups is also observed. The initiating additives possess a lower photochemical activity relative to PMMA. The acceleration is due to stronger light absorption by these additives, compared to the polymer. |
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