Hyperbranced Polymers by Photoinduced Self‐Condensing Vinyl Polymerization Using Bisbenzodioxinone. Issue 10 (15th March 2017)

• Record Type: Journal Article
• Authors: Aydogan, Cansu; Ciftci, Mustafa; Kumbaraci, Volkan; Talinli, Naciye; Yagci, Yusuf
• Is Part Of: Macromolecular chemistry and physics. Volume 218:Issue 10(2017)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2017-03-15
• Subjects: benzodioxinones -- hyperbranched polymers -- photopolymerization -- self‐condensing vinyl polymerization; Polymers -- Periodicals; Polymerization -- Periodicals; Synthetic products -- Periodicals; Macromolecules -- Periodicals; 547.7
• DOI: 10.1002/macp.201700045
• Languages: English
• ISSNs: 1022-1352

Abstract

Abstract : Hyperbranched polymers are synthesized by photoinduced self‐condensing copolymerization of methyl methacrylate and 2‐hydroxyethyl methacrylate (HEMA) or 2‐(dimethylamino)ethyl methacrylate via benzodioxinone photochemistry. UV irradiation stimulates irreversible decomposition of bisbenzodioxinone resulting in formation of benzophenone (BP), the actual photoinitiator and bisketene. In the case of HEMA, additional branching sites are formed by the reaction of ketene with the hydroxyl functionalities of HEMA. Abstract : 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.