title: Rise and Fall: Poly(phenyl vinyl ketone) Photopolymerization and Photodegradation under Visible and UV Radiation.
abstract: Vinyl ketone polymers, including phenyl vinyl ketone (PVK), are an important class of polymers due to their ability to degrade upon irradiation with ultraviolet light which makes them useful for a variety of applications. However, traditional radical methods for synthesizing PVK polymers give rise to poor control or are unable to produce block copolymers. This work uses reversible addition-fragmentation chain transfer polymerization (RAFT) and photochemistry to polymerize PVK. When visible blue radiation of 440 ± 10 nm is used as the light source for the photopolymerization, rapid polymerization and well-defined polymers are created. This RAFT method uses PVK as both monomer and radical initiator, exciting the PVK mono-mer by 440 ± 10 nm irradiation to avoid the use of an additional radical initiator. Once the poly-mer is synthesized, it is stable against degradation by blue light (440 ± 10 nm), but upon exposure to ultraviolet (UV) radiation (310 ± 20 nm) significant decrease in molecular weight is observed. The degradation is observed for all poly(PVK) materials synthesized.
authors.affiliation: 651 East High Street, Oxford, OH, 45058, USA.
authors.forename: Jennifer A
authors.initials: JA
authors.lastname: Reeves
authors.affiliation: 651 East High Street, Oxford, OH, 45058, USA.
authors.forename: Michael L
authors.initials: ML
authors.lastname: Allegrezza
authors.affiliation: 651 East High Street, Oxford, OH, 45058, USA.
authors.forename: Dominik
authors.initials: D
authors.lastname: Konkolewicz
mesh_terms: D007659:Ketones / Q000138:chemical synthesis / Q000737:chemistry*; D008027:Light; D010782:Photolysis / Q000528:radiation effects; D058105:Polymerization / Q000528:radiation effects; D011108:Polymers / Q000138:chemical synthesis / Q000737:chemistry* / Q000528:radiation effects*; D014466:Ultraviolet Rays
chemical_list: D007659:Ketones; D011108:Polymers
keywords: RAFT; phenyl vinyl ketone; photochemistry; photopolymerization; photo­degradation