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Hyperbranced Polymers by Photoinduced Self‐Condensing Vinyl Polymerization Using Bisbenzodioxinone
Author(s) -
Aydogan Cansu,
Ciftci Mustafa,
Kumbaraci Volkan,
Talinli Naciye,
Yagci Yusuf
Publication year - 2017
Publication title -
macromolecular chemistry and physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.57
H-Index - 112
eISSN - 1521-3935
pISSN - 1022-1352
DOI - 10.1002/macp.201700045
Subject(s) - benzophenone , polymer chemistry , methacrylate , photochemistry , branching (polymer chemistry) , polymerization , photosensitizer , polymer , chemistry , methyl methacrylate , hydrogen atom abstraction , radical , photopolymer , radical polymerization , organic chemistry
Branched polymers with different branching densities and their cross‐linked analogues are synthesized by photoinduced self‐condensing vinyl polymerization via benzodioxinone photochemistry. Thus, methyl methacrylate is copolymerized with two different comonomers, namely, 2‐hydroxyethyl methacrylate (HEMA) and 2‐(dimethylamino)ethyl methacrylate in the presence of bisbenzodioxinone (BBNZ) under UV light. Upon irradiation, BBNZ undergoes irreversible decomposition leading to the formation of benzophenone photosensitizer and bisketene. The released benzophenone is further photoexcited at the same wavelength to give the initiating radicals through hydrogen abstraction from the inimer. In the case of HEMA, additional branching sites are formed by the reaction of bisketene with the hydroxyl functionalities of HEMA.