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Coatings 2019, 9(2), 111;

Cage Effect under Photolysis in Polymer Matrices

Department of Chemistry, Columbia University, New York, NY 10027, USA
Emanuel Institute of Biochemical Physics, Russian Academy of Sciences, 119334 Moscow, Russia
Semenov Institute of Chemical Physics, Russian Academy of Sciences, 119991 Moscow, Russia
Author to whom correspondence should be addressed.
Dr. A.F. Efremkin passed away on 12 January 2019.
Received: 4 January 2019 / Revised: 26 January 2019 / Accepted: 31 January 2019 / Published: 12 February 2019
(This article belongs to the Special Issue Light-Curable Coatings)
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Photoinduced elementary reactions of low-MW compounds in polymers is an area of active research. Cured organic polymer coatings often undergo photodegradation by free-radical paths. Besides practical importance, such studies teach how the polymer environment controls elementary free-radical reactions. Presented here is a review of recent literature which reports such studies by product analysis and by a time-resolve technique of photochemical reaction inside the cage of a polymer and in the bulk of a polymer. It was established that application of moderate external magnetic field allows the control of the kinetics of free radicals in elastomers. Preheating and stretching of elastomers affect reactivity of photoproduced radicals. View Full-Text
Keywords: cage effect; geminate recombination; F- and G-radical pairs; polymers; photodissociation; photoreduction; magnetic field effect cage effect; geminate recombination; F- and G-radical pairs; polymers; photodissociation; photoreduction; magnetic field effect

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Khudyakov, I.V.; Levin, P.P.; Efremkin, A.F. Cage Effect under Photolysis in Polymer Matrices. Coatings 2019, 9, 111.

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